Raspberry Pi Publishing MQTT to ESP8266 | Random Nerd Tutorials
Installing Mosquitto Server (MQTT) on Raspberry Pi 3 - YouTube
GitHub - Hariharnath-Paduchuru/MQTT_Controlled_RGB_LED_RaspberryPi_Demo: Control your RGB LEDs on a Raspberry Pi using MQTT Protocol from your Mobile Application
MQTT Based Raspberry Pi Home Automation: Controlling Raspberry Pi GPIO using MQTT Cloud