IoT Hub Continues to Send Events After Device Deletion

Question

Hi Everyone, I have an issue with IoT Hub, Could you help ?

Events such as TwinChangeEvents and DeviceLifecycleEvents are routed from IoT Hub to Event Hub. However, after deleting the deviceId (S5_U0_15312) created in 2016, IoT Hub still sends deviceLifecycleNotification/twinChangeNotification events indefinitely. Additionally, it is not possible to create a device twin with the same Id on IoT Hub. What could be the cause of this issue, and how can it be resolved?

Answer 1

Hello @Tuan Tran,

welcome to this moderated Azure community forum.

If you use the the Azure portal to change devices registration, it can feel these changes are active without any delay.

Still, changes to an IoT Hub device registration in the device registry can take some time because these are handled in a asynchronous way.

This is especially seen when multiple devices are changes in bulk.

I recommend waiting a bit longer and perhaps eg. use the AZ CLI new to the portal UI, just to be sure.

Keep in mind the EventHub only deletes message once these messages are expired.

If the messages are consumed (by some consumer group) it feels these are deleted but the Event hub supports a replay of older messages.

Please check the timestamp of the messages.

If this is not helping, an Azure support ticket is recommended so the support team can look what is happening with your Iot Hub.

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