cron-monitor for lorawan kerlink iot station

cron-monitor.sh

#!/bin/bash
#
# Description: Script that checks if LoRaWAN packet forwarder is running
#              On a Kerlink Wirnet Station
#
# author: Chris Yereaztian <[email protected]>
# last-changed: 2017-08-08

PIDFILE=/var/run/firefly.pid

## if PID file does not exist process has not been started
##
if [ ! -f $PIDFILE ]; then
    echo "LoraWAN Packet Forwarder not running!"
    /etc/init.d/firefly start
    exit 0
fi

## if PID file exists, read pid and check running process
## if process isn't running, packet forwarder has crashed
while IFS='' read -r line || [[ -n "$line" ]]; do
  PID=$line
  echo "PID is $PID"
done < "$PIDFILE"

# check that process is running
isrunning="$(ps | awk -e '{ print $1}' | grep $PID | wc -l)"

# if process is running exit with 0
if [ $isrunning -gt 0 ]; then
  echo "Isrunning $isrunning"
  echo "Process is running. Exiting ... ";
  exit 0
else
  echo "Process is not running. Restarting system service."
  /etc/init.d/firefly start
  exit 0
fi