Azure IotHub -function Trigger

Question

Hi,
I would like to create a separate Azure function trigger for each of the IoT Hub events listed below:

1. DeviceLifeCycleEvents
2. DeviceTwinChanges
3. DeviceTelemetryMessages

Please note that I would like to trigger using Azure IoT Hub message routing as shown in the attached screenshot and not through event grid subscription. Your suggestions will be greatly appreciated.

Best Regards,
Chandra Mohan

Answer 1

Add two more Event Hubs in your custom endpoints for dedicated stream pipelines such as DeviceLifeCycleEvents and DeviceTwinChanges.

Thanks

Roman

Answer 2

Hello @Chandra Mohan
Chandra Mohan,

Thanks for reaching out to us!

IoT Hub currently supports the following Azure services as additional endpoints: Reference Doc link

• Azure Storage containers
• Event Hubs
• Service Bus Queues
• Service Bus Topics

For triggering Azure Function Apps with IoT hub messages please refer to the below mentioned sample walk through,

Processing data from IoT Hub with Azure Functions, I hope this helps you to get started on this integration side.

Also please refer to Azure IoT Hub bindings for Azure Functions.

[Update]

We have to use Intermediate service to trigger Azure Function App. And please note that Device twins are not part of messages, so we have to exclusively make Get calls to get device twins (Example: inside Function App) or make use of the message routing option.

Option I: IoT Hub-->Message Route to Servicebus/EventHub-->Trigger FunctionApp (Create your own FA) (For Telemetry , Twin ,Life cycle changes)

Option II: IoT Hub -->Events-->Event Grid subscription--> configure Function App endpoint (For Device created, Deleted, Connected,Disconnected, Telemetry)

More Info can be read at Azure IoT Hub as an Event Grid source.
One of the articles to start with is React to IoT Hub events by using Event Grid to trigger actions.

Steps:

1)

2)

Please let us know if you need further help.