The internal electrical connections of the Switch Board are done with relays. These relays are operated by ESP8266 to turn the light bulbs on and off. The program is written for operating four light bulbs. However, in practice, we put only two bulbs in operation.
The link to Android App is given below. Please feel free to install the Android app on to your Android mobile phone. As you can see Android App is also designed for operating four bulbs. However, only two bulbs are in operational condition in our first experiment with IOT and MQTT.
https://github.com/swatimshah/SmartHome/
The ESP8266 sketch is given below
