Related to Raspberry Pi - Auto WiFi Hotspot Switch
I've noticed the issue when examining /var/log/syslog and also the uap0 was bouncing back and forth from the ifconfig.
/usr/bin/autohotspot script checks for existing SSIDs in /etc/wpa_supplicant/wpa_supplicant.conf and starts the hotspot only if they are not connected.
Currently configured SSIDs are parsed out of the config using following line:
wpassid=$(awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' ORS=',' | sed 's/\"/''/g' | sed 's/,$//')
The issue was awk -F'ssid=' '{ print $2 }' ORS=',' was comming up empty. So although the wlan0 was connected to the AP it still attempted to create a hotspot.
Remove carraige return char (^M, \r, ASCII 13, 0x0D) prior ORS concatenation.
awk '/ssid="/{ print $0 }' /etc/wpa_supplicant/wpa_supplicant.conf | awk -F'ssid=' '{ print $2 }' | sed 's/\r//g'| awk 'BEGIN{ORS=","} {print}' | sed 's/\"/''/g' | sed 's/,$//'
When Raspberry's Wi-Fi is being set up in a headless fashion from a Windows computer the wpa_supplicant.conf is written with Windows newlines (\r\n) resulting in the configuration file with extra \r (Windows styled newlines). More info about the newlines is avaialble on Wiki.
Following code checks for SSID in output from the wlan0 scan:
if (echo "$ssidreply" | grep "$ssid") >/dev/null 2>&1
My SSID contains -~ which grep interprets as an argument resulting in:
sudo iw dev wlan0 scan | grep "-~["
grep: invalid option -- '~'
if (echo "$ssidreply" | grep -F -- "$ssid") >/dev/null 2>&1
because:
-F, --fixed-strings: Interpret PATTERNS as fixed strings, not regular expressions.
-- specifies end of command options for many commands/shell built-ins, after which the remaining arguments are treated as positional arguments.
Other errors I've encountered and haven't found a solution yet. They're not 100% related to the autohotspot script itself, but may be just manifested during its start due to some other system configuration. They're not necessarily a show stopper either and may appear from time to time but won't affect overall functionality.
Oct 7 12:29:01 hostname kernel: [ 203.019215] ieee80211 phy0: brcmf_vif_set_mgmt_ie: vndr ie set error : -52
Oct 7 12:29:01 hostname kernel: [ 203.019232] ieee80211 phy0: brcmf_cfg80211_scan: scan error (-52)
Oct 7 12:29:09 hostname dnsmasq[1460]: Too few arguments.
Oct 7 12:29:09 hostname dnsmasq[1251]: exiting on receipt of SIGTERM
brcmfmac: brcmf_cfg80211_connect: failed to enable fw supplicant
Active/Open issue - raspberrypi/linux#3318
Oct 7 21:34:50 hostname kernel: [ 1493.074495] ieee80211 phy0: brcmf_update_bss_info: wl dtim_assoc failed (-52)
Oct 7 21:34:50 hostname kernel: [ 1493.074623] ------------[ cut here ]------------
Oct 7 21:34:50 hostname kernel: [ 1493.074941] WARNING: CPU: 0 PID: 1565 at net/wireless/sme.c:756 __cfg80211_connect_result+0x43c/0x4e8 [cfg80211]
Oct 7 21:34:50 hostname kernel: [ 1493.074952] Modules linked in: xt_state xt_conntrack nft_chain_nat xt_MASQUERADE nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 cmac bnep hci_uart btbcm bluetooth ecdh_generic ecc nft_counter xt_DSCP xt_tcpudp nft_compat nf_tables nfnetlink 8021q garp stp llc brcmfmac sg brcmutil uas sha256_generic libsha256 cfg80211 raspberrypi_hwmon rfkill bcm2835_codec(C) bcm2835_v4l2(C) bcm2835_isp(C) v4l2_mem2mem bcm2835_mmal_vchiq(C) videobuf2_vmalloc videobuf2_dma_contig videobuf2_memops snd_bcm2835(C) videobuf2_v4l2 snd_pcm videobuf2_common i2c_bcm2835 snd_timer videodev snd mc vc_sm_cma(C) uio_pdrv_genirq uio fixed i2c_dev ip_tables x_tables ipv6
Oct 7 21:34:50 hostname kernel: [ 1493.075216] CPU: 0 PID: 1565 Comm: kworker/u8:0 Tainted: G C 5.4.69-v7+ #1344
Oct 7 21:34:50 hostname kernel: [ 1493.075221] Hardware name: BCM2835
Oct 7 21:34:50 hostname kernel: [ 1493.075476] Workqueue: cfg80211 cfg80211_event_work [cfg80211]
Oct 7 21:34:50 hostname kernel: [ 1493.075484] Backtrace:
Oct 7 21:34:50 hostname kernel: [ 1493.075507] [<8010d514>] (dump_backtrace) from [<8010d82c>] (show_stack+0x20/0x24)
Oct 7 21:34:50 hostname kernel: [ 1493.075518] r6:b315e000 r5:00000000 r4:80e97b48 r3:33554f4f
Oct 7 21:34:50 hostname kernel: [ 1493.075533] [<8010d80c>] (show_stack) from [<809090c4>] (dump_stack+0xe0/0x124)
Oct 7 21:34:50 hostname kernel: [ 1493.075549] [<80908fe4>] (dump_stack) from [<80120168>] (__warn+0xec/0x104)
Oct 7 21:34:50 hostname kernel: [ 1493.075563] r8:000002f4 r7:00000009 r6:7f2c0168 r5:00000000 r4:00000000 r3:33554f4f
Oct 7 21:34:50 hostname kernel: [ 1493.075577] [<8012007c>] (__warn) from [<80120238>] (warn_slowpath_fmt+0xb8/0xc0)
Oct 7 21:34:50 hostname kernel: [ 1493.075590] r9:7f2c0168 r8:000002f4 r7:7f294d08 r6:00000009 r5:00000000 r4:80e04f88
Oct 7 21:34:50 hostname kernel: [ 1493.075829] [<80120184>] (warn_slowpath_fmt) from [<7f294d08>] (__cfg80211_connect_result+0x43c/0x4e8 [cfg80211])
Oct 7 21:34:50 hostname kernel: [ 1493.075842] r9:00000122 r8:b315fe54 r7:80e04f88 r6:00000000 r5:b0862a0c r4:af660004
Oct 7 21:34:50 hostname kernel: [ 1493.076304] [<7f2948cc>] (__cfg80211_connect_result [cfg80211]) from [<7f260b68>] (cfg80211_process_wdev_events+0x104/0x160 [cfg80211])
Oct 7 21:34:50 hostname kernel: [ 1493.076317] r8:af660090 r7:af660028 r6:af660098 r5:af660004 r4:b0862a00
Oct 7 21:34:50 hostname kernel: [ 1493.076783] [<7f260a64>] (cfg80211_process_wdev_events [cfg80211]) from [<7f260c04>] (cfg80211_process_rdev_events+0x40/0x98 [cfg80211])
Oct 7 21:34:50 hostname kernel: [ 1493.076796] r10:00000000 r9:00000100 r8:00000000 r7:b2ad1100 r6:b3044400 r5:ae9f4460
Oct 7 21:34:50 hostname kernel: [ 1493.076802] r4:af660004
Oct 7 21:34:50 hostname kernel: [ 1493.077263] [<7f260bc4>] (cfg80211_process_rdev_events [cfg80211]) from [<7f25a1b8>] (cfg80211_event_work+0x24/0x2c [cfg80211])
Oct 7 21:34:50 hostname kernel: [ 1493.077270] r5:af533080 r4:ae9f40e4
Oct 7 21:34:50 hostname kernel: [ 1493.077512] [<7f25a194>] (cfg80211_event_work [cfg80211]) from [<8013c548>] (process_one_work+0x17c/0x4b4)
Oct 7 21:34:50 hostname kernel: [ 1493.077520] r4:ae9f40e4 r3:7f25a194
Oct 7 21:34:50 hostname kernel: [ 1493.077535] [<8013c3cc>] (process_one_work) from [<8013cdb0>] (worker_thread+0x54/0x5b4)
Oct 7 21:34:50 hostname kernel: [ 1493.077548] r10:af533080 r9:b315e038 r8:80e03d00 r7:b3044418 r6:00000088 r5:af533094
Oct 7 21:34:50 hostname kernel: [ 1493.077554] r4:b3044400
Oct 7 21:34:50 hostname kernel: [ 1493.077568] [<8013cd5c>] (worker_thread) from [<801431c0>] (kthread+0x13c/0x168)
Oct 7 21:34:50 hostname kernel: [ 1493.077582] r10:a92d30dc r9:b0a53e74 r8:8013cd5c r7:af533080 r6:00000000 r5:a44fbd40
Oct 7 21:34:50 hostname kernel: [ 1493.077587] r4:a92d30c0
Oct 7 21:34:50 hostname kernel: [ 1493.077600] [<80143084>] (kthread) from [<801010ac>] (ret_from_fork+0x14/0x28)
Oct 7 21:34:50 hostname kernel: [ 1493.077607] Exception stack(0xb315ffb0 to 0xb315fff8)
Oct 7 21:34:50 hostname kernel: [ 1493.077617] ffa0: 00000000 00000000 00000000 00000000
Oct 7 21:34:50 hostname kernel: [ 1493.077629] ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Oct 7 21:34:50 hostname kernel: [ 1493.077639] ffe0: 00000000 00000000 00000000 00000000 00000013 00000000
Oct 7 21:34:50 hostname kernel: [ 1493.077652] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80143084
Oct 7 21:34:50 hostname kernel: [ 1493.077659] r4:a44fbd40 r3:80104648
Oct 7 21:34:50 hostname kernel: [ 1493.077667] ---[ end trace fbdc9d8762cd7987 ]---
The error went away once I've installed Autohostpot via provided script.
Oct 7 07:57:32 hostname kernel: [ 43.449838] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:32 hostname avahi-daemon[389]: Interface uap0.IPv4 no longer relevant for mDNS.
Oct 7 07:57:32 hostname avahi-daemon[389]: Leaving mDNS multicast group on interface uap0.IPv4 with address 192.168.69.1.
Oct 7 07:57:32 hostname avahi-daemon[389]: Withdrawing address record for 192.168.69.1 on uap0.
Oct 7 07:57:32 hostname kernel: [ 43.967518] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:32 hostname kernel: [ 44.068743] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.169689] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.270538] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.371530] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.472545] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.573604] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.674692] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.775710] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname kernel: [ 44.876716] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:33 hostname avahi-daemon[389]: Joining mDNS multicast group on interface uap0.IPv4 with address 192.168.69.1.
Oct 7 07:57:33 hostname avahi-daemon[389]: New relevant interface uap0.IPv4 for mDNS.
Oct 7 07:57:33 hostname avahi-daemon[389]: Registering new address record for 192.168.69.1 on uap0.IPv4.
Oct 7 07:57:36 hostname systemd[1]: systemd-hostnamed.service: Succeeded.
Oct 7 07:57:39 hostname kernel: [ 50.714787] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname avahi-daemon[389]: Interface uap0.IPv4 no longer relevant for mDNS.
Oct 7 07:57:40 hostname avahi-daemon[389]: Leaving mDNS multicast group on interface uap0.IPv4 with address 192.168.69.1.
Oct 7 07:57:40 hostname avahi-daemon[389]: Withdrawing address record for 192.168.69.1 on uap0.
Oct 7 07:57:40 hostname kernel: [ 51.237551] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.338683] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.439706] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.540720] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.641764] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.742792] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.843802] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 51.944810] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:40 hostname kernel: [ 52.045897] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:41 hostname kernel: [ 52.146948] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:41 hostname avahi-daemon[389]: Joining mDNS multicast group on interface uap0.IPv4 with address 192.168.69.1.
Oct 7 07:57:41 hostname avahi-daemon[389]: New relevant interface uap0.IPv4 for mDNS.
Oct 7 07:57:41 hostname avahi-daemon[389]: Registering new address record for 192.168.69.1 on uap0.IPv4.
Oct 7 07:57:51 hostname kernel: [ 62.994379] ieee80211 phy0: brcmf_cfg80211_change_iface: iface validation failed: err=-16
Oct 7 07:57:52 hostname avahi-daemon[389]: Interface uap0.IPv4 no longer relevant for mDNS.
Oct 7 07:57:52 hostname avahi-daemon[389]: Leaving mDNS multicast group on interface uap0.IPv4 with address 192.168.69.1.
Oct 7 07:57:52 hostname avahi-daemon[389]: Withdrawing address record for 192.168.69.1 on uap0.