How to send message to device after provisioning with mqtt x509?

Question

I'm using the azure_sdk_for_c to provisioning with Azure it hub following the example paho_iot_provisioning_sample. I can successfully get the Hub Hostname and device ID from DPS but I don't know how to publish a message to the device. May I need to disconnect to DPS and make a direct connection to the IoT hub after that? And in this case, May I use the same certificate with DPS?

Answer 1

Hello @Hop Vu ,
Welcome to Microsoft Q&A and thank you for your question!

If you are following the samples as described here: https://github.com/Azure/azure-sdk-for-c/blob/master/sdk/samples/iot/README.md

1) Can you confirm that you completed all prerequisites?

DPS is used to register your device on a linked IoT Hub. Therefore the D2C and C2D messages will be done at the IoTHub level already created in your Azure Subscription.

See the following doc for better understanding: Provisioning devices with Azure IoT Hub Device Provisioning Service

Thank you!

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