Using the ESP8266-01 module to control a Relay using MQTT

• ESP8266 Boards Manager: http://arduino.esp8266.com/Arduino/versions/2.0.0/doc/installing.html
• AdaFruit_MQTT: https://learn.adafruit.com/mqtt-adafruit-io-and-you/arduino-plus-library-setup
• ArduinoJson: https://arduinojson.org/

• Boards Manager: "esp8266 by ESP8266 Community" (ref: https://arduino-esp8266.readthedocs.io/en/latest/)
• Board Type: Generic ESP8266 (Tools->Board->Generic ESP8266 Module)
• Baud Rate: 115200

Fill the following details for connecting to the WiFi router (at your home):

• WLAN_SSID
• WLAN_PASS

As this is a Demo project, I have used AdaFruit IO's Feeds as the MQTT Broker to communicate with the Device. (see https://accounts.adafruit.com).

You will need the following details of your AdaFruit IO (AIO) account:

• AIO_USERNAME
• AIO_KEY <= This can be accessed/generated from: https://io.adafruit.com/<AIO_USERNAME>/dashboards (look for the "My Key" tab on the menubar).
• AIO_MQTT_FEED_ONOFFBUTTON <= The name of the feed to which the Device should subscribe (would start with something like "/feeds/<FEED_NAME>").

1. Using ESP8266 GPIO0/GPIO2/GPIO15 pins
2. How to Use the ESP8266-01 Pins and Leds
3. ESP8266 Pinout Reference
4. Beginners Guide To The Paho MQTT Python Client
5. http://test.mosquitto.org/