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7	7	= 1. Introduction =
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10	10	Azure IoT Hub is designed around standalone end devices communicating directly with the hub. Each end device must connect to the hub via one of the supported communication protocols ([[MQTT>>url:https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-mqtt-support]] / [[AMQP>>url:https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-amqp-support]]). These protocols are inherently stateful - each individual end device must have one connection always open in order to send and receive messages from the Azure IoT Hub.
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12	12	The Azure IoT Hub integration prefers to use an asynchronous, stateless communication style. When uplink messages are received from an end device, the integration connects on demand to the Azure IoT Hub and submits the message, and also updates the Device Twin. The data plane protocol used between The Things Stack and Azure IoT Hub is [[MQTT>>url:https://docs.microsoft.com/en-us/azure/iot-hub/iot-hub-mqtt-support]], and the connections are always secure using [[TLS 1.2>>url:https://datatracker.ietf.org/doc/html/rfc5246]].
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21	21	Learn how to deploy the Azure IoT Hub integration for The Things Stack.
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24	24	== 2.1 Prerequisites ==
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99	99	The Azure IoT Hub integration for The Things Stack synchronizes the device registry: you can create devices in Azure IoT Hub which trigger an Azure Function that creates the device in The Things Stack.
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101	101	(% style="color:red" %)**Note:**
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103	103	Devices that you create in The Things Stack are automatically created as Azure IoT Hub devices as soon as they activate or send their first uplink message.