Add support for the Azure IotHub fallback route

[IvanovOleg]

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Description

When you create an IoT Hub with a custom route via terraform, the IoTHub fallback route is disabled by default which is not suitable. If you enable this parameter in portal and run terraform again, it disables it.

New or Affected Resource(s)

• azurerm_iothub

Potential Terraform Configuration

# Copy-paste your Terraform configurations here - for large Terraform configs,
# please use a service like Dropbox and share a link to the ZIP file. For
# security, you can also encrypt the files using our GPG public key.

References

• #0000

[danielscholl]

The default action of creating a hub via cli or portal is to have the IoT fallback route enabled. The default action of the terraform creating a hub is to have the IoT fallback route disabled with no option to enable it.

Terraform Configuration

provider "azurerm" {
  version = "=1.21.0"
}

resource "azurerm_resource_group" "test" {
  name     = "IoTEdgeResources"
  location = "eastus2"
}

resource "azurerm_iothub" "test" {
  name                = "tf-hub"
  resource_group_name = "${azurerm_resource_group.test.name}"
  location            = "${azurerm_resource_group.test.location}"

  sku {
    name     = "S1"
    tier     = "Standard"
    capacity = "1"
  }
}

Azure CLI Commands

# Create a Hub
az iot hub create --resource-group IoTEdgeResources --name test-cli-hub --sku S1 --location eastus2

# View fallbackRoute status
az iot hub list -g IoTEdgeResources --query \
  "[].{name:name, fallback:properties.routing.fallbackRoute.isEnabled}" \
  -otable

Creation Result

Name             Fallback
-----------      ----------
test-cli-hub     True
test-tf-hub      False

[BlueBasher]

Terraform is indeed disabling the fallback route by default.
The difference is in the RoutingProperties, there should be a fallbackRoute and depending on a setting it should set isEnabled to true or false.

Terraform created

"routing": {
	"endpoints": {
		"serviceBusQueues": [],
		"serviceBusTopics": [],
		"eventHubs": [],
		"storageContainers": []
	},
	"routes": [],
	"fallbackRoute": {
		"name": "$fallback",
		"source": "DeviceMessages",
		"condition": "true",
		"endpointNames": [
			"events"
		],
		"isEnabled": false
	}
},

Azure Portal created

"routing": {
	"endpoints": {
		"serviceBusQueues": [],
		"serviceBusTopics": [],
		"eventHubs": [],
		"storageContainers": []
	},
	"routes": [],
	"fallbackRoute": {
		"name": "$fallback",
		"source": "DeviceMessages",
		"condition": "true",
		"endpointNames": [
			"events"
		],
		"isEnabled": true
	}
},

[StefanSchoof]

I think this issue can be closed, since #2764 is merged and is released with 1.23.0

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 [email protected]. Thanks!