Domoticz

It is stored in /home/pi/domoticz/scripts/dzVents/data/__data_<scripts name> for as long as it is not deleted.
Then it is created again with new initial values.
More https://www.domoticz.com/wiki/DzVents:_ ... stent_data

Ok that's helpfull info, specially for me i'm not in to programming or scripting a lot. I can manage some simple stuff and now I have more stuff to play with