You have smart devices deployed around your IoT landscape.
You need to monitor their operation health.
You experience that some of the devices have connectivity issues from time to time.
Which part of the module twins should you explore first to troubleshoot the problem?
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: B.
Option A is incorrect because the $EdgeHub module twin contains data about communications between the IoT Edge hub running on a device and your Azure IoT hub.
For connectivity issues in general, you should start investigating the $EdgeAgent first.
Option B is CORRECT because it is the EdgeAgent that is responsible for monitoring the operation of modules on your device.
$EdgeAgent contains connectivity and health data of the modules deployed.
In case of connectivity issues, you should start here, with examining the status and last update time, before digging deeper.
Option C is incorrect because while troubleshooting, you should look for information coming from the device.
The .tags section of the device/module twins is only visible for the backend services; you'll find no live data reported by the device there.
Option D is incorrect because the IoT Edge security daemon is responsible for the operations of IoT Edge security manager.
It represents a portion of the computing base of the IoT Edge device.
For connectivity-related information, look at the $EdgeAgent first.
References:
In an IoT solution, a module twin is a JSON document that represents the desired and reported state of a module. It includes metadata, properties, and tags. The desired state describes the state that the module should be in, while the reported state describes the current state of the module.
To troubleshoot connectivity issues of smart devices in your IoT landscape, the first module twin to explore is $EdgeHub.properties.reported. Edge Hub is a component of Azure IoT Edge that routes messages between devices and the cloud. $EdgeHub.properties.reported includes information about the status of the connection between the devices and Edge Hub. It provides information such as the number of messages sent and received, the connection status, and any errors that occurred during the communication. By exploring this module twin, you can identify if there are any connectivity issues with the devices and diagnose the root cause of the problem.
The other options provided in the question are not directly related to connectivity issues. $EdgeAgent metadata provides information about the module, such as the module ID and the version number. $EdgeAgent.tags and .properties are used to filter modules when performing operations such as deployment or module management. $SecurityDaemon.properties.reported provides information about the security state of the module. While these module twins can provide useful information in certain scenarios, they are not the primary source of information for troubleshooting connectivity issues.