What is the brand:
What kind of device would you like to be added :
What kind of category signal would the app use :
Is there a (public) API / documentation or known other implementations (like Blogs/Github etc)
Yes an IP/RS232 list of commands. https://www.anthemav.com/downloads/MRX-x40-AVM-70-90-IP-RS-232-v5.xls
Are you willing to loan or donate a device to a developer?
Devices are hell expensive but I can test and donate developer