Subscribe to websocket messages and publish to MQTT

[daniel-simpson]

Tried a few months ago to get this working publishing to MQTT, and realised it was missing subscribe / publish calls.

Tested locally, pushes to a Mosquitto instance with no problems

(Unrelated: also managed to consume messages in Node RED and Home assistant, and even turn off the oven at the end of a cook. So cool! Thanks again for a great project :) )