Auto reconnect a Raspberry Pi by pinging google. Does ifdown and ifup is connection is down.

reconnect.sh

#!/bin/bash
HOST=google.com
while :
do
    if ping -c 1 $HOST &> /dev/null
    then
      echo 1
  else
      echo 0
      # Restart connection if unavailable
      sudo ifdown wlan0 && sudo ifup wlan0
    fi
    sleep 1
done