#!/bin/bash

ping -nq -W 1 -c 1 1.1.1.1 > /dev/null 2>&1
state=$?
oldstate=$state

while true; do
  ping -nq -W 1 -c 1 1.1.1.1 > /dev/null 2>&1
  state=$?

  if [[ $oldstate -ne $state ]]; then
    if [[ $state -eq 0 ]]; then
      echo "Device went back online"
    else
      echo "Device went offline"
    fi
  fi

  oldstate=$state
  sleep 5
done