MIMIC MQTT Simulator: test MQTT5 support in Azure Event Grid
First see that flickering light telemetry is sent in MQTT 3.1.1.
Then change to MQTT 5, see CONNACK properties, and that it is still published.
Then change QOS from 0 to 1, still sent, see the PUBACK.
Then change QOS to 2, see MQTT reason code 0x9b in CONNACK.
See details at https://mqttlab.iotsim.io