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In this tutorial I show some "secrets" of MQTT like QoS, Last Will, Keep-Alive etc. I build a scenario for a Sonoff switch and use Node-Red for the experiments. At the end, you should know how to deal with these parameters.
With the new "Raspberry Pi Zero W" we can build a MQTT broker for under 20 $
Sketch: github.com/Sen...
AsyncMQTTclient and PubSub libraries can be installed by the Arduino IDE library manager
MQTT/Node-Red video: • Node Red MQTT on the R...
Installing MQTT: learn.adafruit...
oshlab.com/ins...
Node-Red on Raspberry: nodered.org/doc...
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/ andreas-spiess-7331894...
/ spiessa