iot hub message routing - chunk size

Fischer, Johannes 21 Reputation points
2021-02-11T08:21:10.433+00:00

Hallo,

i am using the free IoT Hub with a messagerouting to a container in a blob storage. In general it works very well. But when the file size of the avro-file exeeds 2.1MB i get an error message. You can see it in the attachment. This is something i wonder about, because the chunk size window ranges from 10 to 500MB.

Does this relate to the free tier of the IoT Hub? Do i need to have an other tier to increase the chunk size?

Best regards
jo

66859-error-message.jpg

Azure Blob Storage
Azure Blob Storage
An Azure service that stores unstructured data in the cloud as blobs.
2,564 questions
Azure IoT Hub
Azure IoT Hub
An Azure service that enables bidirectional communication between internet of things (IoT) devices and applications.
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  1. Sander van de Velde | MVP 30,711 Reputation points MVP
    2021-02-11T15:07:41.703+00:00

    So, no there is no limitation to the IoT Hub, it's just a limitation of the Azure portal.

    I'm not sure what you mean with chunk size. This is normally related to the D2C messages. This is the limitation of 8000, 400.000 etc. messages per day. One D2C message is measured in chunks with the size of 0.5 Kb or 4 Kb (the larger one if the IoT Hub is not running on a free tier). So, eg. a message of 6.1Kb is counted as 2 chunks (in case of a S1 size it hub) or 13 chuncks for the free tier.

    Sending over a file to Azure storage using IoT Hub is only metered regarding a start and end message .

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