Read our blog which describes our IoT parking lot demo and the technology behind it. We will also tell you how to use Azure IoT Hub to send messages between Azure services and devices to achieve the same level of communication we had in our demo. You will learn about the different modules we have used in our demo and how to develop simple applications using Azure IoT Hub. Follow this link: https://www.toradex.com/blog/iot-parking-lot-demo-on-toradex-modules