OpenWrt cron job to check the connection and, if there is no connection, reboot the Huawei E3272 modem using the hilink api.

check_connection

#!/bin/ash
# OpenWrt cron job to check the connection and,  if there is no connection,
# reboot the Huawei E3272 modem using the hilink api. This script is optimized
# for busybox and written in ash.
# Put this script in /bin/check_connection and then: chmod +x /bin/check_connection
# Then: crontab -e
# */15 * * * * /bin/check_connection > /tmp/reboot_con.log 2>&1

f="/tmp/reboot_lock"
if [ ! -f "$f" ]; then
  echo "last reboot: never"
  touch "$f"
fi

last_reboot=`date -r $f +%s`
let difference=`date +%s`-$last_reboot
echo "last reboot: $difference seconds ago";

if [ $difference -lt 900 ]; then
  echo "reboot occurred within the last 15 minutes. bailing."
  exit 0
fi

alias reboot_modem='curl '\''http://192.168.1.1/api/device/control'\'' -H '\''Origin: http://192.168.1.1'\'' -H '\''Content-Type: application/x-www-form-urlencoded; charset=UTF-8'\'' -H '\''Accept: */*'\'' -H '\''Referer: http://192.168.1.1/html/reboot.html'\'' -H '\''X-Requested-With: XMLHttpRequest'\'' -H '\''Connection: keep-alive'\'' --data '\''<?xml version="1.0" encoding="UTF-8"?><request><Control>1</Control></request>'\'' '  

ping -W 60 -s 2000 8.8.8.8 -c 1 > /dev/null
if [ "$?" -eq "0" ]; then
  echo "connected";
  exit 0;
else
  echo "connection timed out after 60 seconds. trying again...";
  ping -W 60 -s 2000 8.8.8.8 -c 1 > /dev/null
  if [ "$?" -eq "0" ]; then
    echo "reconnected";
    exit 0;
  else
    echo "still disconnected. initiating reboot...";
    touch "$f"
    reboot_modem
    sleep 60
  fi
fi