Has someone managed to control as Relais connected to gpio of a raspberry pi with mqtt?
I tried mqtt openhab3 and other psu Control sub Plugins but when I select the switch and sensing method to plugin, i can't select any gpio in none of the plugins.
I think you're looking for using the base PSU Control for controlling the pins on the pi for a relay, and then the other plugin (no sub-plugin) for commanding it via MQTT remotely.