earlephilhower · July 13, 2022 03:24
diff --git a/log.txt b/log.txt
 --loop
 --loop
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:f8:5a, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.49 - 7c:d3:0a:1f:f8:5a
 etharp_find_entry: found empty entry 0
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 etharp_timer
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 pbuf_alloc(length=150)
 pbuf_alloc(length=150) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:38:2c:4a:90:fa:80, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xff01a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       136     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0xb5b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   97  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 136 p->tot_len 136
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 116
 UDP header:
 +-------------------------------+
 |     46250     |      7788     | (src port, dest port)
 +-------------------------------+
 |       116     |     0xf74a    | (len, chksum)
 +-------------------------------+
 udp (192.168.1.255, 7788) <-- (192.168.1.97, 46250)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=150)
 pbuf_alloc(length=150) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:38:2c:4a:90:fa:80, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xff01a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       136     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0xb5b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   97  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 136 p->tot_len 136
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 116
 UDP header:
 +-------------------------------+
 |     33305     |      7788     | (src port, dest port)
 +-------------------------------+
 |       116     |     0xec2e    | (len, chksum)
 +-------------------------------+
 udp (192.168.1.255, 7788) <-- (192.168.1.97, 33305)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 etharp_timer
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 pbuf_alloc(length=103)
 pbuf_alloc(length=103) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:2c:4c:c6:d5:45:74, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 etharp_timer
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 pbuf_alloc(length=215)
 pbuf_alloc(length=215) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xffffffff netif->ip_addr 0x8301a8c0 (0xffffff, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       201     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0x7819     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   99  | (src)
 +-------------------------------+
 |  255  |  255  |  255  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 201 p->tot_len 201
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 181
 UDP header:
 +-------------------------------+
 |     56243     |      7437     | (src port, dest port)
 +-------------------------------+
 |       181     |     0xf0a4    | (len, chksum)
 +-------------------------------+
 udp (255.255.255.255, 7437) <-- (192.168.1.99, 56243)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:a8:57, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.34 - 7c:d3:0a:1f:a8:57
 etharp_find_entry: found empty entry 0
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 etharp_timer
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:f8:5a, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.49 - 7c:d3:0a:1f:f8:5a
 etharp_find_entry: found empty entry 0
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:a8:57, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.34 - 7c:d3:0a:1f:a8:57
 etharp_find_entry: found empty entry 0
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=74)
 pbuf_alloc(length=74) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        60     | (v, hl, tos, len)
 +-------------------------------+
 |     1464      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb118     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 60 p->tot_len 60
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919764          | (seq no)
 +-------------------------------+
 |           0000000000          | (ack no)
 +-------------------------------+
 | 10 |   |000010|     64240     | (hdrlen, flags (SYN 
 ), win)
 +-------------------------------+
 |    0x796e     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5ba (40)
 tcp_input: packed for LISTENing connection.
 TCP connection request 38054 -> 3000.
 memp_malloc: out of memory in pool SYS_TIMEOUT
 tcp_parseopt: MSS
 tcp_parseopt: other
 tcp_parseopt: other
 tcp_parseopt: NOP
 tcp_parseopt: other
 tcp_enqueue_flags: queuelen: 0
 pbuf_alloc(length=4)
 pbuf_alloc(length=4) == 0x20022850
 pbuf_add_header: old 0x200228ac new 0x20022898 (20)
 tcp_enqueue_flags: queueing 6510:6511 (0x12)
 tcp_enqueue_flags: 1 (after enqueued)
 tcp_output: snd_wnd 64240, cwnd 1, wnd 1, effwnd 0, seq 6510, ack 6510
 tcp_output: snd_wnd 64240, cwnd 1, wnd 1, effwnd 0, seq 6510, ack 6510, i 0
 tcp_output_segment: rtseq 6510
 tcp_output_segment: 6510:6510
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=8a61
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        44     | (v, hl, tos, len)
 +-------------------------------+
 |        4      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ec     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 etharp_find_entry: found empty entry 0
 etharp_find_entry: selecting empty entry 0
 etharp_request: sending ARP request.
 pbuf_alloc(length=28)
 pbuf_alloc(length=28) == 0x200228b8
 etharp_raw: sending raw ARP packet.
 pbuf_add_header: old 0x200228d8 new 0x200228ca (14)
 ethernet_output: sending packet 0x200228b8
 pbuf_free(0x200228b8)
 pbuf_free: deallocating 0x200228b8
 etharp_query: queued packet 0x20022850 on ARP entry 0
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.8 - 18:c0:4d:8d:07:cc
 etharp_find_entry: found matching entry 0
 etharp_update_arp_entry: updating stable entry 0
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 pbuf_free(0x20022850)
 pbuf_free: 0x20022850 has ref 1, ending here.
 etharp_input: incoming ARP reply
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1465      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb12b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919765          | (seq no)
 +-------------------------------+
 |           0000006511          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64240     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8e1     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: SYN_RCVD
 TCP connection established 38054 -> 3000.
 WS:ac
 tcp_receive: window update 64240
 tcp_receive: slow start cwnd 2
 tcp_receive: ACK for 6511, unacked->seqno 6510:6511
 tcp_receive: removing 6510:6511 from pcb->unacked
 tcp_receive: queuelen 1 ... pbuf_free(0x20022850)
 pbuf_free: deallocating 0x20022850
 0 (after freeing unacked)
 tcp_receive: pcb->rttest 0 rtseq 6510 ackno 6511
 tcp_process (SYN_RCVD): cwnd 4380 ssthresh 11680
 tcp_output: nothing to send (0)
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, seg == NULL, ack 6511
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 :ref 1
 WS:av status=4 WCav=0
 :ref 2
 :ur 2
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:f8:5a, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.49 - 7c:d3:0a:1f:f8:5a
 etharp_find_entry: found empty entry 1
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 etharp_timer
 pbuf_alloc(length=87)
 pbuf_alloc(length=87) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:a8:57, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.34 - 7c:d3:0a:1f:a8:57
 etharp_find_entry: found empty entry 1
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=42)
 pbuf_alloc(length=42) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:9c:93:4e:7b:78:97, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.50 - 9c:93:4e:7b:78:97
 etharp_find_entry: found empty entry 1
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=46)
 pbuf_alloc(length=46) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:9c:93:4e:7b:78:97, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:7c:d3:0a:1f:f8:5a, type:806
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 etharp_update_arp_entry: 192.168.1.49 - 7c:d3:0a:1f:f8:5a
 etharp_find_entry: found empty entry 1
 etharp_find_entry: no empty entry found and not allowed to recycle
 etharp_input: incoming ARP request
 etharp_input: ARP request was not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 etharp_timer
 pbuf_alloc(length=150)
 pbuf_alloc(length=150) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:38:2c:4a:90:fa:80, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xff01a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       136     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0xb5b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   97  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 136 p->tot_len 136
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 116
 UDP header:
 +-------------------------------+
 |     57255     |      7788     | (src port, dest port)
 +-------------------------------+
 |       116     |     0xcc4d    | (len, chksum)
 +-------------------------------+
 udp (192.168.1.255, 7788) <-- (192.168.1.97, 57255)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=150)
 pbuf_alloc(length=150) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:38:2c:4a:90:fa:80, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xff01a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       136     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0xb5b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   97  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 136 p->tot_len 136
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 116
 UDP header:
 +-------------------------------+
 |     36571     |      7788     | (src port, dest port)
 +-------------------------------+
 |       116     |     0x8d1d    | (len, chksum)
 +-------------------------------+
 udp (192.168.1.255, 7788) <-- (192.168.1.97, 36571)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=215)
 pbuf_alloc(length=215) == 0x2000c560
 ethernet_input: dest:ff:ff:ff:ff:ff:ff, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0xffffffff netif->ip_addr 0x8301a8c0 (0xffffff, 0x1a8c0, 0xff000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |       201     | (v, hl, tos, len)
 +-------------------------------+
 |        0      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |   17  |    0x7819     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |   99  | (src)
 +-------------------------------+
 |  255  |  255  |  255  |  255  | (dest)
 +-------------------------------+
 ip4_input: p->len 201 p->tot_len 201
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 udp_input: received datagram of length 181
 UDP header:
 +-------------------------------+
 |     56243     |      7437     | (src port, dest port)
 +-------------------------------+
 |       181     |     0xf0a4    | (len, chksum)
 +-------------------------------+
 udp (255.255.255.255, 7437) <-- (192.168.1.99, 56243)
 pcb (0.0.0.0, 68) <-- (0.0.0.0, 67)
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |     1466      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb124     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 46 p->tot_len 46
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919765          | (seq no)
 +-------------------------------+
 |           0000006511          | (ack no)
 +-------------------------------+
 |  5 |   |011000|     64240     | (hdrlen, flags (PSH ACK 
 ), win)
 +-------------------------------+
 |    0x15f2     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags PSH ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 tcp_receive: pcb->rttest 0 rtseq 6510 ackno 6511
 :rn 6
 tcp_output: nothing to send (0)
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, seg == NULL, ack 6511
 State: ESTABLISHED
 tcp_recved: received 1 bytes, wnd 11675 (5).
 tcp_recved: received 1 bytes, wnd 11676 (4).
 tcp_recved: received 1 bytes, wnd 11677 (3).
 tcp_recved: received 1 bytes, wnd 11678 (2).
 tcp_recved: received 1 bytes, wnd 11679 (1).
 :c0 1, 6
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 tcp_recved: received 1 bytes, wnd 11680 (0).
 dsad

 :wr 6 0
 tcp_write(pcb=0x2001e5fc, data=0x20041f50, len=6, apiflags=1)
 tcp_write: queuelen: 0
 pbuf_alloc(length=1460)
 pbuf_alloc(length=1460) == 0x20022850
 pbuf_add_header: old 0x200228ac new 0x20022898 (20)
 tcp_write: queueing 6511:6517
 tcp_write: 1 (after enqueued)
 :wrc 6 6 0
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |        5      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |        6      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |        7      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |        8      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |        9      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       10      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       11      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       12      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       13      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       14      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37e0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       15      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37df     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       16      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37de     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       17      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37dd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       18      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37dc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       19      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37db     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       20      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37da     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       21      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       22      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       23      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       24      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       25      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       26      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       27      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       28      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       29      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       30      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37d0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       31      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       32      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ce     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       33      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       34      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       35      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       36      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ca     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       37      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       38      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64240, cwnd 4380, wnd 4380, effwnd 6, seq pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1480      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb11c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 tcp_receive: window update 64234
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       39      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       40      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1481      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb11b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       41      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37cb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       42      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1484      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb118     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       43      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       44      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1487      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb115     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       45      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       46      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1488      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb114     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       47      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       48      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37be     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1489      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb113     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       49      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       50      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37bc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1490      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb112     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       51      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37c1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       52      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ba     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1491      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb111     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       53      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37bf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       54      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1492      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb110     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       55      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37bd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       56      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1493      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb10f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       57      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37bb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       58      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1495      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb10d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       59      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       60      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1496      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb10c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       61      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       62      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1497      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb10b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       63      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       64      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ae     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1498      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb10a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       65      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       66      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ac     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1499      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb109     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       67      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37b1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       68      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37aa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1500      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb108     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       69      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37af     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       70      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1501      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb107     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       71      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ad     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       72      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1502      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb106     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       73      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37ab     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       74      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1503      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb105     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       75      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       76      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1504      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb104     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       77      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       78      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1505      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb103     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       79      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       80      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1506      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb102     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       81      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       82      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1507      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb101     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       83      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x37a1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       84      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1508      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb100     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       85      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       86      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3798     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1509      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ff     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       87      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       88      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3796     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1510      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0fe     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       89      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x379b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       90      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3794     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=46)
 pbuf_alloc(length=46) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:9c:93:4e:7b:78:97, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1511      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0fd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       91      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3799     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       92      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3792     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1512      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0fc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       93      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3797     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       94      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3790     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1513      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0fb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       95      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3795     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       96      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1514      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0fa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       97      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3793     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |       98      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1515      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |       99      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3791     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      100      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1516      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      101      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      102      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3788     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1517      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      103      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      104      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3786     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1518      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      105      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x378b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      106      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3784     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1519      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      107      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3789     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      108      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3782     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1520      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      109      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3787     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      110      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3780     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1521      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      111      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3785     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      112      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1522      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      113      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3783     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      114      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1523      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      115      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3781     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      116      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1524      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0f0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      117      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      118      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3778     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1525      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ef     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      119      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      120      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3776     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1526      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ee     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      121      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x377b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      122      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3774     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1527      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ed     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      123      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3779     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      124      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3772     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1528      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ec     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      125      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3777     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      126      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3770     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1529      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0eb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      127      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3775     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      128      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1530      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ea     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      129      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3773     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      130      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1531      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      131      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3771     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      132      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1532      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      133      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      134      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3768     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1533      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      135      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      136      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3766     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1534      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      137      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x376b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      138      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3764     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1535      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      139      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3769     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      140      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3762     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1536      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      141      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3767     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      142      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3760     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1537      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      143      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3765     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      144      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1538      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      145      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3763     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      146      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1539      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      147      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3761     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      148      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1540      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0e0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      149      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      150      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3758     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1541      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0df     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      151      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      152      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3756     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1542      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0de     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      153      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x375b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      154      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3754     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1543      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0dd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      155      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3759     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      156      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3752     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1544      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0dc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      157      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3757     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      158      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3750     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1545      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0db     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      159      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3755     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      160      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1546      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0da     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      161      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3753     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      162      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1547      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      163      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3751     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      164      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1548      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      165      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      166      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3748     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1549      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      167      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      168      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3746     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1550      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      169      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x374b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      170      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3744     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1551      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      171      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3749     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      172      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3742     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1552      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      173      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3747     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      174      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3740     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1553      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      175      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3745     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      176      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1554      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      177      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3743     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      178      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1555      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      179      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3741     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      180      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1556      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0d0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      181      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      182      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3738     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1557      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0cf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      183      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      184      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3736     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1558      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ce     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      185      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x373b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      186      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3734     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1559      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0cd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      187      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3739     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      188      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3732     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1560      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0cc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      189      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3737     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      190      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3730     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1561      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0cb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      191      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3735     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      192      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1562      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ca     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      193      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3733     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      194      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1563      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      195      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3731     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      196      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1564      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      197      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      198      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3728     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1565      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      199      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      200      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3726     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1566      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      201      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x372b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      202      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3724     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1567      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      203      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3729     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      204      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3722     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1568      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      205      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3727     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      206      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3720     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1569      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      207      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3725     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      208      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1570      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      209      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3723     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      210      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1571      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      211      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3721     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      212      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1572      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0c0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      213      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      214      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3718     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1573      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0bf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      215      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      216      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3716     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1574      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0be     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      217      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x371b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      218      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3714     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1575      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0bd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      219      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3719     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      220      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3712     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1576      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0bc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      221      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3717     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      222      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3710     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1577      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0bb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      223      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3715     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      224      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1578      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ba     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      225      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3713     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      226      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1579      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      227      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3711     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      228      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1580      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      229      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      230      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3708     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1581      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      231      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      232      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3706     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1582      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      233      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x370b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      234      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3704     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1583      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      235      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3709     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      236      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3702     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1584      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      237      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3707     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      238      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3700     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1585      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      239      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3705     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      240      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36fe     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1586      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      241      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3703     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      242      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36fc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1587      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      243      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3701     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      244      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36fa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1588      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0b0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      245      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ff     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      246      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1589      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0af     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      247      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36fd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      248      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1590      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ae     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      249      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36fb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      250      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1591      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ad     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      251      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      252      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1592      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ac     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      253      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      254      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1593      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0ab     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      255      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      256      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ee     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1594      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0aa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      257      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      258      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ec     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1595      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      259      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36f1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      260      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ea     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1597      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      261      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ef     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      262      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1598      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      263      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ed     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      264      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1599      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      265      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36eb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      266      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1600      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      267      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      268      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1601      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      269      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      270      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1602      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      271      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      272      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36de     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1603      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      273      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      274      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36dc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1604      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb0a0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      275      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36e1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      276      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36da     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=84)
 pbuf_alloc(length=84) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=84)
 pbuf_alloc(length=84) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=84)
 pbuf_alloc(length=84) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=84)
 pbuf_alloc(length=84) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=85)
 pbuf_alloc(length=85) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:ac:84:c6:6c:ef:f4, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1605      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb09f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      277      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36df     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      278      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1606      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb09e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      279      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36dd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      280      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1607      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb09d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      281      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36db     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      282      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1608      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb09c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      283      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      284      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1612      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb098     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      285      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      286      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1613      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb097     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      287      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      288      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ce     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1614      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb096     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      289      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      290      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36cc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1615      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb095     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      291      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36d1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      292      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ca     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1616      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb094     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      293      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36cf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      294      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1617      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb093     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      295      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36cd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      296      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1618      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb092     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      297      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36cb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      298      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1619      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb091     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      299      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      300      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1620      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb090     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      301      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      302      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1621      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      303      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      304      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36be     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1622      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      305      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      306      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36bc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1623      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      307      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36c1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      308      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ba     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1624      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      309      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36bf     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      310      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1625      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      311      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36bd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      312      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1626      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb08a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      313      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36bb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      314      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1627      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb089     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      315      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      316      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1628      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb088     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      317      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      318      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1629      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb087     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      319      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      320      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ae     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1630      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb086     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      321      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      322      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ac     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1631      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb085     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      323      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36b1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      324      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36aa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1632      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb084     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      325      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36af     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      326      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1633      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb083     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      327      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ad     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      328      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=122)
 pbuf_alloc(length=122) == 0x2000c560
 ethernet_input: dest:01:00:5e:00:00:fb, src:9c:93:4e:7b:78:97, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip4_input: UDP packet to DHCP client port 5353
 ip4_input: packet not for us.
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1634      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb082     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      329      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36ab     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      330      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1635      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb081     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      331      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a9     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      332      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a2     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1636      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb080     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      333      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a7     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      334      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a0     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1637      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      335      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a5     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      336      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1638      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      337      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a3     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      338      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1639      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      339      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x36a1     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      340      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1640      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      341      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      342      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3698     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1641      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      343      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      344      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3696     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1642      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb07a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      345      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x369b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      346      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3694     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1643      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb079     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      347      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3699     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      348      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3692     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1644      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb078     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      349      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3697     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      350      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3690     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1645      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb077     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      351      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3695     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      352      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1646      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb076     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      353      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3693     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      354      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1647      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb075     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      355      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3691     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      356      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1648      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb074     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      357      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      358      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3688     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1649      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb073     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      359      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      360      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3686     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1650      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb072     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      361      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x368b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      362      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3684     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1651      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb071     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      363      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3689     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      364      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3682     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1652      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb070     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      365      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3687     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      366      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3680     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1653      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      367      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3685     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      368      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1654      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      369      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3683     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      370      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1655      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      371      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3681     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      372      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1656      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      373      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      374      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3678     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1657      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      375      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      376      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3676     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1658      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb06a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      377      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x367b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      378      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3674     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1659      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb069     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      379      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3679     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      380      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3672     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1660      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb068     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      381      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3677     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      382      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3670     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1661      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb067     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      383      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3675     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      384      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1662      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb066     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      385      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3673     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      386      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1663      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb065     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      387      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3671     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      388      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1664      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb064     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      389      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      390      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3668     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1665      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb063     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      391      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      392      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3666     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1666      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb062     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      393      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x366b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      394      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3664     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1667      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb061     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      395      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3669     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      396      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3662     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1668      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb060     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      397      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3667     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      398      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3660     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1669      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      399      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3665     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      400      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1670      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      401      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3663     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      402      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1671      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      403      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3661     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      404      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1672      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      405      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      406      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3658     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1673      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      407      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      408      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3656     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1674      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb05a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      409      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x365b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      410      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3654     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1675      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb059     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      411      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3659     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      412      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3652     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1676      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb058     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      413      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3657     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      414      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3650     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1677      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb057     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      415      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3655     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      416      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1678      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb056     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      417      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3653     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      418      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1679      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb055     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      419      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3651     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      420      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1680      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb054     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      421      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      422      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3648     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1681      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb053     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      423      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      424      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3646     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1682      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb052     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      425      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x364b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      426      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3644     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1683      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb051     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      427      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3649     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      428      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3642     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1684      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb050     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      429      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3647     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      430      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3640     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1685      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      431      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3645     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      432      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1686      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      433      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3643     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      434      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1687      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      435      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3641     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      436      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1688      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      437      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      438      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3638     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1689      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      439      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      440      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3636     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1690      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb04a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      441      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x363b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      442      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3634     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1691      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb049     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      443      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3639     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      444      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3632     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1692      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb048     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      445      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3637     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      446      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3630     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1693      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb047     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      447      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3635     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      448      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1694      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb046     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      449      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3633     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      450      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1695      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb045     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      451      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3631     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      452      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1696      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb044     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      453      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      454      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3628     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1697      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb043     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      455      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      456      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3626     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1698      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb042     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      457      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x362b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      458      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3624     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1699      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb041     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      459      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3629     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      460      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3622     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1700      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb040     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      461      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3627     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      462      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3620     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1701      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      463      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3625     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      464      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1702      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      465      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3623     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      466      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1703      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      467      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3621     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      468      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1704      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      469      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      470      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3618     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1705      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      471      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      472      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3616     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1706      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb03a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      473      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x361b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      474      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3614     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1707      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb039     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      475      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3619     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      476      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3612     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1708      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb038     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: ESTABLISHED
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      477      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3617     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      478      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3610     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: ESTABLISHED
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 etharp_timer
 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b78d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      479      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 :wustmo
 :ur 1
 :dsrcv 0
 :close
 tcp_close: closing in State: ESTABLISHED
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      480      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360e     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 WS:dis
 :del
 --loop
 --loop
 --loop
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1709      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb037     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      481      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3613     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      482      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1710      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb036     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      483      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3611     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      484      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1711      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb035     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      485      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      486      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3608     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1712      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb034     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      487      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      488      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3606     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1713      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb033     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      489      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x360b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      490      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3604     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1714      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb032     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      491      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3609     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      492      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3602     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1715      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb031     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      493      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3607     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      494      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3600     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1716      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb030     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006517          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64234     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8db     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      495      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3605     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6517
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64234, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      496      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35fe     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: FIN_WAIT_1
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1717      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb02f     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919771          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010001|     64233     | (hdrlen, flags (FIN ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags FIN ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: FIN_WAIT_1
 tcp_receive: window update 64233
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919771
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      497      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3603     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6518
 tcp_receive: received FIN.
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      498      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35fc     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: CLOSING
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1719      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb02d     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919772          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64233     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: CLOSING
 tcp_receive: window update 64233
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919772
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      499      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x3601     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6518
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      500      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35fa     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: CLOSING
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1720      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb02c     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919772          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64233     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: CLOSING
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919772
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      501      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35ff     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6518
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      502      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35f8     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: CLOSING
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1721      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb02b     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919772          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64233     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: CLOSING
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919772
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      503      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35fd     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6518
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      504      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35f6     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: CLOSING
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1722      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb02a     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919772          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64233     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: CLOSING
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919772
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      505      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35fb     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022e9c new 0x20022e8e (14)
 ethernet_output: sending packet 0x20022e68
 pbuf_free(0x20022e68)
 pbuf_free: deallocating 0x20022e68
 tcp_receive: pcb->rttest 0 rtseq 6511 ackno 6518
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511
 tcp_output: snd_wnd 64233, cwnd 4380, wnd 4380, effwnd 6, seq 6511, ack 6511, i 0
 tcp_output_segment: rtseq 6511
 tcp_output_segment: 6511:6517
 inet_chksum_pseudo(): checksumming pbuf 0x20022850 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=b88d
 pbuf_add_header: old 0x20022898 new 0x20022884 (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        46     | (v, hl, tos, len)
 +-------------------------------+
 |      506      |000|       0   | (id, flags, offset)
 +-------------------------------+
 |  255  |    6  |    0x35f4     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (dest)
 +-------------------------------+
 ip4_output_if: call netif->output()
 pbuf_add_header: old 0x20022884 new 0x20022876 (14)
 ethernet_output: sending packet 0x20022850
 State: CLOSING
 pbuf_free(0x2000c560)
 pbuf_free: deallocating 0x2000c560
 pbuf_alloc(length=60)
 pbuf_alloc(length=60) == 0x2000c560
 ethernet_input: dest:28:cd:c1:00:ef:dd, src:18:c0:4d:8d:07:cc, type:800
 pbuf_remove_header: old 0x2000c570 new 0x2000c57e (14)
 ip_input: iphdr->dest 0x8301a8c0 netif->ip_addr 0x8301a8c0 (0x1a8c0, 0x1a8c0, 0x83000000)
 ip4_input: packet accepted on interface e0
 ip4_input: 
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x10 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |     1723      |010|       0   | (id, flags, offset)
 +-------------------------------+
 |   64  |    6  |    0xb029     | (ttl, proto, chksum)
 +-------------------------------+
 |  192  |  168  |    1  |    8  | (src)
 +-------------------------------+
 |  192  |  168  |    1  |  131  | (dest)
 +-------------------------------+
 ip4_input: p->len 40 p->tot_len 40
 pbuf_remove_header: old 0x2000c57e new 0x2000c592 (20)
 TCP header:
 +-------------------------------+
 |    38054      |     3000      | (src port, dest port)
 +-------------------------------+
 |           3577919772          | (seq no)
 +-------------------------------+
 |           0000006518          | (ack no)
 +-------------------------------+
 |  5 |   |010000|     64233     | (hdrlen, flags (ACK 
 ), win)
 +-------------------------------+
 |    0xe8da     |         0     | (chksum, urgp)
 +-------------------------------+
 inet_chksum_pseudo(): checksumming pbuf 0x2000c560 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=ffff
 pbuf_remove_header: old 0x2000c592 new 0x2000c5a6 (20)
 +-+-+-+-+-+-+-+-+-+-+-+-+-+- tcp_input: flags ACK 
 -+-+-+-+-+-+-+-+-+-+-+-+-+-+
 State: CLOSING
 pbuf_alloc(length=20)
 pbuf_alloc(length=20) == 0x20022e68
 tcp_output: sending ACK for 3577919772
 inet_chksum_pseudo(): checksumming pbuf 0x20022e68 (has next 0) 
 inet_chksum_pseudo(): pbuf chain lwip_chksum()=cd49
 pbuf_add_header: old 0x20022eb0 new 0x20022e9c (20)
 ip4_output_if: e00
 IP header:
 +-------------------------------+
 | 4 | 5 |  0x00 |        40     | (v, hl, tos, len)
 +-------------------------------+
 |      507      |000|