Azure IoTHub Python SDK: ConnectionFailedError while sending messages to Azure IoTHub using Python SDK

Praveen Palakodeti 11

While sending messages to Azure IoTHub from Python SDK, frequently the connection is lost with different error messages viz: 'Failed to receive on socket', 'transport.connect raised error'
Attached the screenshot.

And some times, IoTHub is receiving multiple(duplicate) messages for the same request.

Versions:
azure-iot-device==2.2.0
azure-iot-hub==2.2.2

Attached the sample code.

Please help.

33549-iothubclient-pythonsdk.txt

António Sérgio Azevedo 7,666 Reputation points Microsoft Employee

2020-10-21T12:06:47.257+00:00
Welcome to Microsoft Q&A @Praveen Palakodeti !

Can you run the sample in this quickststart and report if you have the same issues?

Quickstart: Send telemetry from a device to an IoT hub and read it with a back-end application (Python)

Please use latest versions:

azure-iot-device==2.3.0

azure-iot-hub==2.2.3

Thanks!
Praveen Palakodeti 11 Reputation points

2020-10-21T13:56:12.09+00:00

Hello,

The sample in the quick start runs fine.

We suspect that the issue is with the message size.
We are sending a 100kb message for every 40 seconds and IoThub frequently throws that exception.

Behaviour is same with the latest versions(2.3.0) as well.

Please note that it was working fine till 2 weeks ago despite we were sending 240kb message.
António Sérgio Azevedo 7,666 Reputation points Microsoft Employee

2020-10-22T11:20:47.92+00:00

Thanks for confirming @Praveen Palakodeti ,

I am trying to repro your issue on my environment.
Praveen Palakodeti 11 Reputation points

2020-10-23T13:04:08.433+00:00

Hi,

Did you get a chance to reproduce this?
António Sérgio Azevedo 7,666 Reputation points Microsoft Employee

2020-10-23T17:55:44.197+00:00

Hello @Praveen Palakodeti I couldn't reproduce your issue yet.

I have synced with iot sdk python devs and requested that you file a new bug under the repo.

Could you be so kind and file a new bug here? https://github.com/Azure/azure-iot-sdk-python/issues

Please reference this thread in the issue created and announce here when you do so.

Thank you so much!
Praveen Palakodeti 11 Reputation points

2020-10-23T20:37:00.29+00:00

Hi,

I have raised it in the GitHub, here is the link.

https://github.com/Azure/azure-iot-sdk-python/issues/698

Thank you.
Praveen Palakodeti 11 Reputation points

2020-10-26T11:21:39.31+00:00

Hello,

I raised it in Github.
Do you know when this issue will be addressed?
António Sérgio Azevedo 7,666 Reputation points Microsoft Employee

2020-10-28T15:39:23.653+00:00

Hello @Praveen Palakodeti ,

As mentioned by Elena in the related thread: This looks like an issue with the IoT Hub service rather than the SDK.

Can you please contact us through an Azure Support Ticket so we can have a 1:1 call with you and check logs and PII data not possible to share publicly?

Thanks!
Praveen Palakodeti 11 Reputation points

2020-10-29T12:26:06.25+00:00

Yes, I have raised a ticket and they are investigating it.
Thanks for your support.

1 answer

António Sérgio Azevedo 7,666 Reputation points Microsoft Employee

2020-12-15T01:19:47.76+00:00
Hello @Praveen Palakodeti ,

As per the Azure Support Ticket closure reason:

"We are not able to reproduce this now... this might be due to bad network conditions that occur randomly."

Please feel free to comment below if you ever face the issue again. For now I will kindly request that you mark this as the answer to help others as well.

Thank you so much for all the time you spent with us in this support request.

Remember:

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Azure IoTHub Python SDK: ConnectionFailedError while sending messages to Azure IoTHub using Python SDK

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