Currently, IoT Hub offers two ways of implementing the MQTT protocol. The first option is to use the IoT Hub device SDK itself. This is suitable if you can easily write the code on the device side.

Secondly, you might face challenges in using IoT device SDK and writing the code on the device; especially if you have old devices in the fields. The solution is to use the MQTT protocol directly.

Let's try the option with IoT Hub device SDK first, and in the next section, we will go through another method.