Hello again!
About the logout from the app… One user can only be logged into comfort cloud from one device. I had the same problem when I added my girlfriend’s phone. You need to register a new user to comfort cloud (Homeassistant user) and request access to the heat pump. You as an owner can than allow the access. Then you are able to use several users (devices) at the same time.
I’m looking forward to a custom component 
/Reik