Hi,
Vallox ventilation units are built in many houses. The Vallox units have an API as well as a webserver and allow to change the ventilation speed, as well as showing information such as temperature inside, outside and filter status.
There is already a websockets API for the vallox ventilation units.
It should be fairly easy to integrate, however, I’m too noob to program and so I’d love to see it nativly supported.