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By survivingwithandroid
#85618 This project describes how to build an ESP8266 MQTT client that connects to Raspberry Pi with Mosquitto.

ESP8266 sends sensor readings to Mosquitto and with Node-red we can build a UI dashboard.

ESP8266 subscribes to a MQTT channel and receive data from Node-red.

https://www.survivingwithandroid.com/esp8266-mqtt-client-publish-subscribe/