How to implement Routes functionality for Twin Change in Azure Iot-hub?

Question

I have set Routes for update twin and select endpoint as events(default) supported by Iot hub but it is not working.

Here is in screenshot

Am i doing anything wrong or something is missing ? Any advice or references to other material would be appreciated.

@Rita Hab For receiving event i use azure function and tried both EventHubTrigger and IoT Hub (EventHub) - JavaScript template. Here it is as follow : module.exports = function (context, IoTHubMessages) { context.log(JavaScript eventhub trigger function called for message array ${IoTHubMessages}); IoTHubMessages.forEach(message => { context.log(Processed message ${JSON.stringify(message)}); }); context.done(); }; — Akshat Desai
@Rita Han for binding in function json : { "bindings": [ { "type": "eventHubTrigger", "name": "IoTHubMessages", "direction": "in", "path": "iothub-ehub-HUBNAME-192805-73caa1654c", "connection": "HUBNAME_events_IOTHUB", "cardinality": "many", "consumerGroup": "myconsumer" } ], "disabled": false } — Akshat Desai
Your binding information looks like correct. What about the locations of your IoT Hub and Azure Function? — Rita Han
ya, Location for IoT Hub and Azure Function is different but i still get normal device message (not twin changes Events) as log, in azure function logs. — Akshat Desai

Roman Kiss Roman Kiss · Accepted Answer · 2017-09-13T12:37:24

Your Routes setup is correct. I am guessing the problem is on the consumer side of the Azure IoT Hub events (default endpoint). You can use for test purpose a Device Explorer tool. The following screen snippet shows my example:

other quick option to consume these events is creating a azure function

using System;

public static void Run(string myIoTHubMessage, TraceWriter log)
{
    log.Info($"C# IoT Hub trigger function processed a message: {myIoTHubMessage}");
}

function.json file:

{
  "bindings": [
    {
      "type": "eventHubTrigger",
      "name": "myIoTHubMessage",
      "direction": "in",
      "path": "myPath",
      "connection": "myevents_IOTHUB",
      "consumerGroup": "$Default",
      "cardinality": "many"
    }
  ],
  "disabled": true
 }

One more thing, you can press the button Run for testing a match. It should be shown Result:Match

How to implement Routes functionality for Twin Change in Azure Iot-hub?

2 Answers