1. How Virtuino MQTT app can communicate with an ESP8266 or ESP32 board using the Thingspeak MQTT broker
2. How configure Virtuino MQTT to communicate with the Thingspeak MQTT broker
3. How upoload sensor values to Thingspeak MQTT broker from an ESP8266 or ESP32 board
4. How send send commands to enable or disable the ESP pins from an Android phone using Virtuino MQTT app
5. How communicate with the server Thingspeak using MQTT
Download the example code from here:
http://virtuino.com/downloads/example...
Download the MQTT library that you need for this example from here:
https://github.com/256dpi/arduino-mqtt
Download Virtuino MQTT app from here:
https://play.google.com/store/apps/de...
You can check on your device after a successful connection here: https://thingspeak.com