WAN LED script for TP-Link Archer C5 V4

openwrt_archerc5v4_wan_check.sh

# save this script in /lib/wan_check.sh
# and add 
#  /lib/wan_check.sh & 
# in /etc/rc.local

while true ; do
	Status=$(ping -q -c 2 -W 1 1.1.1.1 > /dev/null 2>&1 && echo "ok" || echo "FAIL")
	if [ "$Status" = "ok" ]; then
        on="green"; off="orange"
    else
        on="orange"; off="green"
    fi
    echo 0 > /sys/class/leds/archer-c5-v4:$off:wan/brightness
    echo 255 > /sys/class/leds/archer-c5-v4:$on:wan/brightness
done