Check wifi connection on RPi2 and reboot if no connection.

checkwifi.sh

#!/usr/bin/env bash
# Script for checking wifi connection on my headless, hidden, Raspberry Pi 2
# The idea is to reboot the RPi2 when network connection is lost, so it can come
# up again. Making administration efforts minimal.
# Crontab:
# 0,10,20,30,40,50 * * * * /home/pi/checkwifi.sh

logger -t checkwifi "Checking wifi"

# Change 192.168.0.1 to your router IP-address, or use Google DNS 8.8.8.8 
ping -c4 192.168.76.1 > /dev/null

if [ $? != 0 ]
then
  logger -t checkwifi "Wifi not OK, rebooting"
  sudo /sbin/shutdown -r now
fi

logger -t checkwifi "Wifi OK, no reboot"