In my personal opinion best way is to sense the output voltage via an optocoupler and read the state using an Arduino or ESP and feed domoticz with the results (without triggering On/Off actions). I use this method to sense a local switched relay (using standard wall switch) and update domoticz ...

Hi guys. At home I have a network of raspberry Pi 3’s running. Numerous as slaves and one as a master which my Siri connects to using homebridge and this works great. On my slave in the loft I have a large relay board to which I have rewired all my lighting to be 2 way, going to the relay board. The ...