Light switch facia for core2
If you had a light switch facia that the core2 could be installed and use it as a smart home hub for each room.
It would need a transformer, but could use the electrical wires to send information between units as well as for power.
Include BTL for a generic bluetooth speaker, wifi, mic, temp sensor, sd card in front to hold music and connect to music streaming service like spotify or apple music.
camera at front door displays on screens when doorbell is pressed.
Most people have 15-20 light switches in each house.
Host a service $1 per month with a pretty UI to administer accounts with a digital twin of the estate.