I've been busy with the prototype and I an say I'm happy with the work done. I have the prototype (see the attached project photo) communicating with misterhouse (room temperature, humidity and I can poll the status of the traffic light - the Red/Yellow/Green LEDs). Misterhouse is now sending the commands to change the traffic light (8 seconds, green, 4 seconds yellow, 8 seconds red). This works very well but found out 2 things. One: Mosquitto 1.4 is a bit buggy and Two: that MQTT QoS is on the subscription side. Now I have to figure out what that means to my varius programs.