Troubleshooting Lost Messages in Azure IoT Solution
Question
You are building an industrial IoT solution where, using several S1 IoT hubs, you collect telemetry data from a number of field sensors.
The data collected by the IoT hubs must be forwarded to a Storage Container and to be published to a Service Bus topic to make them available for consumer services.
You have configured the message routes and queries for the two endpoints but while testing, you notice that some of the messages don't reach any of the configured targets, they are lost.
What is the recommended solution?
Answers
Explanations
Click on the arrows to vote for the correct answer
A. B. C. D.Correct Answer: B.
Option A is incorrect because the messages/events is the default built-in endpoint of the IoT hub.Howevers, once a route is created, data stops flowing to this endpoint.
While you can create an explicit route there, it is recommended to enable the fallback route which automatically directs all messages not caught by the queries of the other routes to messages/events.
Option B is CORRECT because the fallback route has to be enabled so that messages that don't satisfy query conditions on any of the existing routes are forwarded to the built-in-Event Hubs endpoint (messages/events).
Option C is incorrect because once a route is created, data stops flowing to the built-in-endpoint, unless a route is created to that endpoint, or the fallback route is enabled.
It is the disabled fallback route that probably caused the problem.
Option D is incorrect because the feedback queue is for the cloud-to-device message direction, i.e.
it doesn't play any role here.
Diagram:
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References:
In an industrial IoT solution where telemetry data is collected from field sensors using multiple IoT hubs, it is important to ensure that all the data is being transmitted to the required endpoints. In this scenario, some messages are lost during transmission, and the recommended solution is to investigate and address the potential causes of message loss.
Option A, "Configure a route to the messages/events endpoint," is not a recommended solution to the problem of lost messages. Configuring a route may help ensure that messages are directed to the correct endpoint, but it does not address the issue of message loss.
Option B, "Make sure the fallback route is enabled," may be a possible solution to the problem of lost messages. The fallback route is used when the primary route is not available or is unable to transmit messages. Enabling the fallback route may help ensure that messages are not lost due to a temporary or intermittent issue with the primary route.
Option C, "Make sure the fallback route is disabled," is not a recommended solution to the problem of lost messages. Disabling the fallback route would not address the issue of message loss and may result in even more messages being lost.
Option D, "Make sure the feedback queue is enabled," is not a recommended solution to the problem of lost messages. The feedback queue is used to provide feedback on the status of message delivery and does not address the root cause of message loss.
In summary, the recommended solution for lost messages in an industrial IoT solution with multiple IoT hubs is to investigate and address the potential causes of message loss, which may include enabling the fallback route, improving network connectivity, or optimizing the message route queries.