Install the Required Libraries

Now we will need to install the Adafruit IO, Adafruit MQTT, and ArduinoHttpClient libraries using the Arduino Library Manager. Navigate to the Manage Libraries... option in the Sketch -> Include Library menu.

Enter Adafruit IO Arduino into the search box, and click Install on the Adafruit IO Arduino library option to install version 3.2.0 or higher.

Enter Adafruit MQTT into the search box, and click Install on the Adafruit MQTT library option to install version 1.0.0 or higher.

Enter ArduinoHttpClient into the search box, and click Install on the ArduinoHttpClient library option to install version 0.2.0 or higher.