Which property is used to store device tags in Azure IoT Hub?

The correct choice is based on the specific functionality of Azure IoT Hub's device management features. In Azure IoT Hub, device tags are stored under the "properties.tags" property. This allows users to associate metadata with devices, such as geographical location, equipment type, or any relevant categorization that aids in managing and organizing devices.

Using tags is beneficial, especially when dealing with a large fleet of devices, as it enables efficient filtering and grouping based on the characteristics defined in the tags. Tags can be updated by the device management service or directly through Azure IoT Hub, and they offer a flexible way to manage and categorize devices without impacting the device's actual functionality or performance.

On the other hand, the other options each refer to different aspects of the properties associated with devices in Azure IoT Hub. The "properties.reported" is used for sending telemetry data from the device to the cloud, capturing the device's current state. "properties.desired" allows the cloud to communicate configuration settings and desired states to the device. The "deviceId" simply identifies the device itself and does not store additional metadata like tags. Understanding the specific roles of these properties is crucial for effectively managing devices within Azure IoT Hub.