Hi Bernd,
yeah, I saw the readme meanwhile. Is there any particular reason why you go with a Number and not a String to show the origin directly? In the JSON I can see the origin as a String when pulling from the API Webpage.
Regarding NULL - I’m also struggeling with timeseries first time setup every time! Item stays NULL until the next value update. In this case next full hour or 15 minutes. I still don’t know why the items doesn’t get filled immediately.
I opened a separate topic for the time series issues - here: A few issue with time series. No response yet and not sure whom from the Maintainers to ping..