#125 MQTT meets SONOFF: QoS, Last Will, Keep-Alive, etc. explained and shown

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: https://github.com/SensorsIot/MQTT-meets-Sonoff
AsyncMQTTclient and PubSub libraries can be installed by the Arduino IDE library manager

MQTT/Node-Red video: https://youtu.be/WxUTYzxIDns
Installing MQTT: https://learn.adafruit.com/diy-esp8266-home-security-with-lua-and-mqtt/configuring-mqtt-on-the-raspberry-pi
https://oshlab.com/install-mqtt-mosquitto-raspberry-pi/
Node-Red on Raspberry: http://nodered.org/docs/hardware/raspberrypi.html
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Видео #125 MQTT meets SONOFF: QoS, Last Will, Keep-Alive, etc. explained and shown канала Andreas Spiess