MQTT sample setup on ESP8266 | MyController.org - The Open Source Controller
ESP8266 – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Connection issues with ESP8266 and mosquitto · Issue #320 · knolleary/ pubsubclient · GitHub
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Help with code. Willing to pay - Jobs and Paid Consultancy - Arduino Forum
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NodeMCU Lesson 6 — MQTT Basic Example « osoyoo.com
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wifi - NodeMCU esp8266 using PubSubClient.h callback function gets ignored - Stack Overflow
Getting Started with MQTT on Arduino Using NodeMCU ESP8266
