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Is there any functionality within the Azure IoT device SDKs to ensure that a message is sent to the hub from a device in the event of a loss of connectivity and subsequent termination and restart (after connectivity is restored) of the application sending the message?

I am struggling to find anything about this in the documentation; I have found this question, however it has not been updated in nearly 2 years and I suspect (hope) things have moved on since then.

The application will be WPF, running on Windows 10 Professional if that makes any difference.

Martin Robins
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2 Answers2

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This blog has a section on the reliability features in the SDKs. We will have more documentation on this soon. You may also want to implement some heat beat mechanism so devices can auto-reboot.

Yi Zhong - MSFT
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  • Thanks, but the blog does not really explain whether or not messages will be stored locally and/or how to make that happen. If I am to use an IoT hub, I need to know that a message will get through irrespective of what happens to the application. – Martin Robins Dec 07 '17 at 12:31
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One way to implement that functionality is check the callback function result and the parent (SendConfirmationCallback - IoTHubClient_LL_SendEventAsync in SDK-C). With this You can check the quantity of messages without confirmation OK and restart your process of azure or Internet connection.

gonzales.luisf
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