Sidehistorik
I have a propritary system called ZenseHome around in the house, all wall lightswitches and outlets are ZenseHome, and several ceiling outlets too.
At some point, ZenseHome added MQTT support for their system, so I created this:
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Pressing the Switch send a signal over 220V cable to the ZenseHome box, that post a message on a MQTT Tpoic, that Home Assistent picks up, and sends a toogle to the Hue Brige, that informs the Lamp over ZigBee..
Worked ok 
Later I introduced Node-RED:
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