mqtt-publisher mqtt-publisher is responsible to publish the data from sensor. I am using Blynk app as for the sensor. Steps : Run the .ino file on your ESP8266. Don't forget to change your ssid, wifi password, Blynk auth token Resources: https://github.com/yusufsuhair/mqtt-backend-frontend https://github.com/yusufsuhair/mqtt-subscriber https://github.com/yusufsuhair/mqtt-publisher