Get Ethernet and WiFi bandwidth in Android

Ethernet:-
- Make ethernet_bw.sh file.
- Copy below code snippet in file.
  
    #!/bin/sh
    INTERVAL="1"  # update interval in seconds
    while true
    do
        R1=`cat /sys/class/net/eth0/statistics/rx_bytes`
        T1=`cat /sys/class/net/eth0/statistics/tx_bytes`
        sleep $INTERVAL
        R2=`cat /sys/class/net/eth0/statistics/rx_bytes`
        T2=`cat /sys/class/net/eth0/statistics/tx_bytes`
        TBPS=`expr $T2 - $T1`
        RBPS=`expr $R2 - $R1`
        TKBPS=`expr $TBPS / 1024`
        RKBPS=`expr $RBPS / 1024`
        echo "TX eth0: $TKBPS kB/s RX eth0: $RKBPS kB/s"
    done

- Push ethernet_bw.sh file to Android device through ADB and start script.

WiFi :- 
- Make wifi_bw.sh file.
- Copy below code snippet in file.
  
    #!/bin/sh
    INTERVAL="1"  # update interval in seconds
    while true
    do
        R1=`cat /sys/class/net/wlan0/statistics/rx_bytes`
        T1=`cat /sys/class/net/wlan0/statistics/tx_bytes`
        sleep $INTERVAL
        R2=`cat /sys/class/net/wlan0/statistics/rx_bytes`
        T2=`cat /sys/class/net/wlan0/statistics/tx_bytes`
        TBPS=`expr $T2 - $T1`
        RBPS=`expr $R2 - $R1`
        TKBPS=`expr $TBPS / 1024`
        RKBPS=`expr $RBPS / 1024`
        echo "TX eth0: $TKBPS kB/s RX eth0: $RKBPS kB/s"
    done

- Push wifi_bw.sh file to Android device through ADB and start script.