This post will tell you everything you need to know about MQTT communication which will enable you to use it communicate between devices.

As a follow up to the room thermometer project, we write a sketch that communicates with an online weather service and displays the weather.

Use a Nano 33 IoT or a MKR WiFi 1010 to access a TI SensorTag to easily build a powerful BLE data logger.

Via Telegram, control thermal printers remotely to print out notes, shopping lists, URLs, payments, barcodes, and episode release dates.

Via Arduino Nano 33 IoT and a PHP web application, check whether you have a particular book in your library before purchasing by using ISBN.

Weather station that display temperature, humidity and pressure on your Android phone with Blynk IoT server.

Inexpensive/disposable wearable two-way communication system for restaurant/grocery/retail workers