if you dont want to install anything to restart domoticz when it's crash. you can put crontab to check it with bash script like this

put this on your cront :

*/1 * * * * sudo /opt/Domoticz/scripts/online_check.sh 2>&1 >> /dev/null

and this is online_check.sh

#!/bin/bash
#Title check_domoticz_online.sh
# check domoticz
sudo service domoticz.sh status
# if not found - equals to 1, start it
if [ $? -eq 1 ]
then
sudo service domoticz.sh restart
else
echo "Domoticz running - do nothing"
fi

I would like to print that one for my pet ;)

@kunall This might be useful for you:

http://www.mathertel.de/Arduino/OneButtonLibrary.aspx