Openwrt: D-Link DIR-842 C2 - Switch on a led when internet connection is available

internet-check.sh

# Switch on a led when internet connection is available

#!/bin/bash
#
while :
do

ping -c5 -q 8.8.8.8
status=$?;
case $status in
    0)
        echo "host is alive";
    ;;
    1)
        echo "network unreachable or host not responding to pings";
    ;;
    2)
        echo "No route to host or other error";
    ;;
esac
if [ $status -eq 0 ]; then
    /bin/echo "Internet is up"
    /bin/echo "1" > /sys/class/leds/green:wps/brightness # wps led on
else
    /bin/echo "Internet is down"
    /bin/echo "0" > /sys/class/leds/green:wps/brightness # wps led off
fi
sleep 30
done

# give the right permission
# chmod 755 /root/internet-check.sh

# to launch the script at the startup, put the following line right before the "exit 0" line in the "/etc/rc.local" file
# /bin/sh /root/internet-check.sh &

# source: https://forum.openwrt.org/t/how-to-switch-on-a-led-when-internet-connection-is-available/