#!/usr/bin/env bash

wlan='wlan0'
gateway='192.168.1.1'
alias ifup='/sbin/ifup'
alias ifdown='/sbin/ifdown'
alias ifconfig='/sbin/ifconfig'

# Only send two pings, sending output to /dev/null as we don't want to fill logs on our sd card.
# If you want to force ping from your wlan0 you can connect next line and uncomment second line
ping -c2 ${gateway} > /dev/null # ping to gateway from Wi-Fi or from Ethernet
# ping -I ${wlan} -c2 ${gateway} > /dev/null # only ping through Wi-Fi

# If the return code from ping ($?) is not 0 (meaning there was an error)
if [ $? != 0 ]
then
    # Restart the wireless interface
    ifdown --force wlan0
    ifup wlan0
    sleep 5
    ifup wlan0
fi
ping -I ${wlan} -c2 ${gateway} > /dev/null