Netatmo Valves - internet required?

Hi
I am thinking about Netatmo Valves. Does anybody know whether relay needs Internet to be able to talk with HA?

I do not want another spy and wanted to block Internet access for the relay on the router…

There is no official support of this valves from HA. There is only some custome component. I might be wrong but all APIs for Netatmo products require internet.

Thanks! I will look into z wave then :).