Create and delete routes and endpoints by using Azure Resource Manager

Article
04/24/2023

This article shows you how to export your Azure IoT Hub template, add a route to your IoT hub, and then redeploy the template to your IoT hub by using the Azure CLI or Azure PowerShell. Use an Azure Resource Manager template to create routes and endpoints for Azure Event Hubs, Azure Service Bus queues and topics, and Azure Storage.

Azure Resource Manager templates are useful when you want to define resources by using a JSON file. Every Azure resource has a template that defines the components that are used in that resource. You can export all Azure resource templates.

Important

When you use a Resource Manager template to deploy a resource, the template replaces any existing resource of the type you're deploying.

When you create a new IoT hub, overwriting an existing deployed resource isn't a concern. To create a new IoT hub, you can use a basic template that has the required properties instead of exporting an existing template from an IoT hub that's already deployed.

However, if you add a route to an existing IoT hub Resource Manager template, use a template that you export from your IoT hub to ensure that all existing resources and properties remain connected after you deploy the updated template. Resources that are already deployed won't be replaced. For example, an exported Resource Manager template that you previously deployed might contain storage information for your IoT hub if you've connected it to storage.

To learn more about how routing works in IoT Hub, see Use IoT Hub message routing to send device-to-cloud messages to different endpoints. To walk through the steps to set up a route that sends messages to storage and then test on a simulated device, see Tutorial: Send device data to Azure Storage by using IoT Hub message routing.

Prerequisites

The procedures that are described in the article use the following resources:

An Azure Resource Manager template
An IoT hub
An endpoint service in Azure

Azure Resource Manager template

This article uses an Azure Resource Manager template in the Azure portal to work with IoT Hub and other Azure services. To learn more about how to use Resource Manager templates, see What are Azure Resource Manager templates?

IoT hub

To create an IoT hub route, you need an IoT hub that you created by using Azure IoT Hub. Device messages and event logs originate in your IoT hub.

Be sure to have the following hub resource to use when you create your IoT hub route:

An IoT hub in your Azure subscription. If you don't have a hub yet, you can follow the steps to create an IoT hub by using an Azure Resource Manager template (PowerShell).

Endpoint service

To create an IoT hub route, you need at least one other Azure service to use as an endpoint to the route. The endpoint receives device messages and event logs. You can choose which Azure service you use for an endpoint to connect with your IoT hub route: Event Hubs, Service Bus queues or topics, or Azure Storage.

Be sure to have one of the following resources to use when you create an endpoint your IoT hub route:

An Event Hubs resource (with container). If you need to create a new Event Hubs resource, see Quickstart: Create an event hub by using a Resource Manager template.
A Service Bus queue resource. If you need to create a new Service Bus queue, see Quickstart: Create a Service Bus namespace and a queue by using a Resource Manager template.
A Service Bus topic resource. If you need to create a new Service Bus topic, see Quickstart: Create a Service Bus namespace with topic and subscription by using a Resource Manager template.
An Azure Storage resource. If you need to create a new Azure Storage, see Create a storage account.

Create a route

In IoT Hub, you can create a route to send messages or capture events. Each route has a data source and an endpoint. The data source is where messages or event logs originate. The endpoint is where the messages or event logs end up. You choose locations for the data source and endpoint when you create a new route in your IoT hub. Then, you use routing queries to filter messages or events before they go to the endpoint.

You can use an event hub, a Service Bus queue or topic, or an Azure storage account to be the endpoint for your IoT hub route. The service that you use to create your endpoint must first exist in your Azure account.

Export the Resource Manager template from your IoT hub

First, export a Resource Manager template from your IoT hub, and then add a route to it.

In the Azure portal, go to your IoT hub. In the resource menu under Automation, select Export template.
In Export template, on the Template tab, complete these steps:
1. View the JSON file that's generated for your IoT hub.
2. Clear the Include parameters checkbox.
3. Select Download to download a local copy of the JSON file.
The template has several placeholders you can use to add features or services to your IoT hub. For this article, add values only to properties that are in or nested under routing.

Add a new endpoint to your Resource Manager template

In the JSON file, find the "endpoints": [] property that's nested under "routing". Complete the steps to add a new endpoint based on the Azure service you choose for the endpoint: Event Hubs, Service Bus queues or topics, or Azure Storage.

To learn how to create an Event Hubs resource (with container), see Quickstart: Create an event hub by using a Resource Manager template.

In the Azure portal, get your primary connection string from your Event Hubs resource. On the resource's Shared access policies pane, select one of your policies to see the key and connection string information. Add your event hub name to the entity path at the end of the connection string. For example, use ;EntityPath=my-event-hubs. This name is your event hub name, not your namespace name.

For name, use a unique value for your Event Hubs endpoint. Leave the id parameter as an empty string. The Azure service provides an id value when you deploy the endpoint.

"routing": {
   "endpoints": {
      "serviceBusQueues": [],
      "serviceBusTopics": [],
      "eventHubs": [
            {
               "connectionString": "my Event Hubs connection string + entity path",
               "authenticationType": "keyBased",
               "name": "my-event-hubs-endpoint",
               "id": "",
               "subscriptionId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
               "resourceGroup": "my-resource-group"
            }
      ],
      "storageContainers": [],
      "cosmosDBSqlCollections": []
   },
},

To learn how to create a Service Bus queue resource (a namespace and queue), see Quickstart: Create a Service Bus namespace and a queue by using a Resource Manager template.

In the Azure portal, get your primary connection string from your Service Bus resource. On the resource's Shared access policies pane, select one of your policies to see the key and connection string information. Add your event hub name to the entity path at the end of the connection string. For example, use ;EntityPath=my-service-bus-queue. This name is your queue name, not your namespace name.

For name, use a unique value for your Service Bus queue endpoint. Leave the id parameter as an empty string. The Azure service provides an id value when you deploy the endpoint.

"routing": {
   "endpoints": {
      "serviceBusQueues": [
            {
               "connectionString": "my Service Bus connection string + entity path",
               "authenticationType": "keyBased",
               "name": "my-service-bus-queue-endpoint",
               "id": "",
               "subscriptionId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
               "resourceGroup": "my-resource-group"
            }
      ],
      "serviceBusTopics": [],
      "eventHubs": [],
      "storageContainers": [],
      "cosmosDBSqlCollections": []
   },
},

If you need to create a Service Bus topic resource (a namespace, topic, and subscription), see Quickstart: Create a Service Bus namespace and a topic by using a Resource Manager template.

In the Azure portal, get your primary connection string from your Service Bus resource. On the resource's Shared access policies pane, select one of your policies to see the key and connection string information. Add your event hub name to the entity path at the end of the connection string. For example, use ;EntityPath=my-service-bus-topic. This name is your topic name, not your namespace name.

For name, enter a unique name for your endpoint. Leave the id parameter as an empty string. The Azure service provides an id value when you deploy the endpoint.

"routing": {
   "endpoints": {
      "serviceBusQueues": [],
      "serviceBusTopics": [
         {
            "connectionString": "my Service Bus connection string + entity path",
            "authenticationType": "keyBased",
            "name": "my-service-bus-topic-endpoint",
            "id": "",
            "subscriptionId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
            "resourceGroup": "my-resource-group"
         }
      ],
      "eventHubs": [],
      "storageContainers": [],
      "cosmosDBSqlCollections": []
   },
},

To learn how to create an Azure Storage resource (a namespace, topic, and subscription), see Create a storage account.

In the Azure portal, get your primary connection string for your Azure Storage resource on the resource's Access keys pane.

For name, enter a unique name for your endpoint. Leave the id parameter as an empty string. The Azure service provides an id value when you deploy the endpoint.

"routing": {
   "endpoints": {
      "serviceBusQueues": [],
      "serviceBusTopics": [],
      "eventHubs": [],
      "storageContainers": [
         {
            "connectionString": "my Azure storage connection string",
            "containerName": "my-container",
            "fileNameFormat": "{iothub}/{partition}/{YYYY}/{MM}/{DD}/{HH}/{mm}.avro",
            "batchFrequencyInSeconds": 100,
            "maxChunkSizeInBytes": 104857600,
            "encoding": "avro",
            "authenticationType": "keyBased",
            "name": "my-storage-endpoint",
            "id": "",
            "subscriptionId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
            "resourceGroup": "my-resource-group"
         }
      ],
      "cosmosDBSqlCollections": []
   },
},

Add a new route to your Resource Manager template

In the JSON file, find the "routes": [] property, nested under "routing", and add the following new route, according to the endpoint service you chose: Event Hubs, Service Bus queues or topics, or Azure Storage.

The default fallback route collects messages from DeviceMessages. Choose a different option, like DeviceConnectionStateEvents. For more information about source options, see az iot hub route.

Caution

If you replace any existing values for "routes" with the route values that are used in the following code examples, the existing routes are removed when you deploy. To preserve existing routes, add the new route object to the "routes" list.

For more information about the template, see Azure Resource Manager template resource definition.

"routes": [
    {
        "name": "MyIotHubRoute",
        "source": "DeviceConnectionStateEvents",
        "condition": "true",
        "endpointNames": [
        "my-event-hubs-endpoint"
        ],
        "isEnabled": true
    }
],

Save your JSON file.

"routes": [
    {
        "name": "MyIotHubRoute",
        "source": "DeviceConnectionStateEvents",
        "condition": "true",
        "endpointNames": [
        "my-service-bus-queue-endpoint"
        ],
        "isEnabled": true
    }
],

Save your JSON file.

"routes": [
    {
        "name": "MyIotHubRoute",
        "source": "DeviceConnectionStateEvents",
        "condition": "true",
        "endpointNames": [
        "my-service-bus-topic-endpoint"
        ],
        "isEnabled": true
    }
],

Save your JSON file.

"routes": [
    {
        "name": "MyIotHubRoute",
        "source": "DeviceConnectionStateEvents",
        "condition": "true",
        "endpointNames": [
        "my-storage-endpoint"
        ],
        "isEnabled": true
    }
],

Save your JSON file.

Deploy the Resource Manager template

With your new endpoint and route added to the Resource Manager template, you can now deploy the JSON file back to your IoT hub.

az deployment group create \
  --name my-iot-hub-template \
  --resource-group my-resource-group \
  --template-file "my\path\to\template.json"

New-AzResourceGroupDeployment `
  -Name MyTemplate `
  -ResourceGroupName MyResourceGroup `
  -TemplateFile "my\path\to\template.json"

Confirm deployment

To confirm that your template deployed successfully to Azure, in the Azure portal, go to your resource group resource. In the resource menu under Settings, select Deployments to see the template in a list of your deployments.

Screenshot that shows a list of deployments for a resource in the Azure portal, with a test template highlighted.

To view your new route in the Azure portal, go to your IoT Hub resource. On the Message routing pane, on the Routes tab, confirm that your route is listed.

Next steps

In this how-to article, you learned how to create a route and endpoint for Event Hubs, Service Bus queues and topics, and Azure Storage.

To learn more about message routing, see Tutorial: Send device data to Azure Storage by using IoT Hub message routing. In the tutorial, you create a storage route and test it with a device in your IoT hub.

Create and delete routes and endpoints by using Azure Resource Manager

Prerequisites

Azure Resource Manager template

IoT hub

Endpoint service

Create a route

Export the Resource Manager template from your IoT hub

Add a new endpoint to your Resource Manager template

Add a new route to your Resource Manager template

Deploy the Resource Manager template

Local deployment

Confirm deployment

Next steps

Additional resources