Switched from Indigo to HA on Rasberry Pi with established Insteon network (no hub). Prior software homekit plugin would represent an insteon i/o link for garage as a single entity to homekit. The net effect was touching the garage button in homekit would trigger momentary close. The color of the icon changes to lit up as the sensor detects open state. Garage button stays lit and “open” until close and sensor says closed.
Currently, I now see switch for the relay which is “dumb” and separate sensor showing open or closed state.