pp_respawn

#!/bin/bash

# Program: pp_respawn 
# Purpose: helper script for starting up and respawning the software for the power plant

	DSSC="dssc.py"

	while true; do

      timestamp=`date "+%Y-%m-%d %H:%M:%S"`
			echo "$0: Startup ($timestamp)"

			# socat server for communication with volkszaehler
      #
      
			echo "$0: Checking for socat server."
			port=`netstat -tulpen 2>/dev/null | grep socat | awk '{ print $4}' | awk -F ':' '{print $2}'`

			if [ "$port" != "12345" ]; then
				echo "$0: No socat server found listening at port 12345"
        echo "    - creating file /tmp/dpm86_current_power.txt"
				touch /tmp/dpm86_current_power.txt
        echo "    - starting socat server"
				nohup socat TCP4-LISTEN:12345,reuseaddr,fork EXEC:"cat /tmp/dpm86_current_power.txt",nofork,end-close &
			else
				echo "$0: Socat seems to listening at port 12345."
			fi

			# dssc
			#
			echo "$0: Killing maybe leftover dssc instances ($DSSC)."
			killall -TERM $DSSC 2>/dev/null

			echo "$0: Starting steering software ($DSSC)"
			./$DSSC

			timestamp=`date "+%Y-%m-%d %H:%M:%S"`
			echo "$0: steering software died ($timestamp)"
	done
		

# this is the last line :-)