Shelly 2.5 did not connect to the broker because it used an old configuration node. With this PR, the node uses the built-in Node-RED MQTT Broker as the other nodes. Fixes: #109
Shelly 2.5 node did not unsubscribe from the old channel with no full redeploy. The deregister does only unsubscribe the node from status changes, so unsubscribing all the subscribed topics was the way to go.
Document Shelly 2.5 node properly. Fixes: #54 and Fixes #55
Add Shelly 2.5 examples
Add integration tests to test with a real MQTT broker