I have successfully added my Harmony hub to HA. With my Harmony, I have the basic (no screen) Companion remote that has 2 “light” buttons (dimmable via volume control) and 2 “switch” buttons.
When I was running Indigo, I was able to expose my Insteon switches as LIFX lights and the Harmony hub would allow me to map these to the above buttons. I could then directly control the lights from the remote.
Is there a way to do this with HA? How do I detect a specific button press?