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A custom allocation policy gives you more control over how devices are assigned to an IoT hub. This is accomplished by using custom code in an Azure Function to assign devices to an IoT hub. The device provisioning service calls your Azure Function code providing all relevant information about the device and the enrollment. Your function code is executed and returns the IoT hub information used to provisioning the device.
By using custom allocation policies, you define your own allocation policies when the policies provided by the Device Provisioning Service don't meet the requirements of your scenario.
For example, maybe you want to examine the certificate a device is using during provisioning and assign the device to an IoT hub based on a certificate property. Or, maybe you have information stored in a database for your devices and need to query the database to determine which IoT hub a device should be assigned to.
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This article demonstrates a custom allocation policy using an Azure Function written in C#. Two new IoT hubs are created representing a Contoso Toasters Division and a Contoso Heat Pumps Division. Devices requesting provisioning must have a registration ID with one of the following suffixes to be accepted for provisioning:
The devices will be provisioned based on one of these required suffixes on the registration ID. These devices will be simulated using a provisioning sample included in the Azure IoT C SDK.
You perform the following steps in this article:
If you don't have an Azure subscription, create a free account before you begin.
Prerequisites
The following prerequisites are for a Windows development environment. For Linux or macOS, see the appropriate section in Prepare your development environment in the SDK documentation.
Use Azure Cloud Shell
Azure hosts Azure Cloud Shell, an interactive shell environment that you can use through your browser. You can use either Bash or PowerShell with Cloud Shell to work with Azure services. You can use the Cloud Shell preinstalled commands to run the code in this article without having to install anything on your local environment.
To start Azure Cloud Shell:
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To run the code in this article in Azure Cloud Shell:
Create the provisioning service and two divisional IoT hubs
In this section, you use the Azure Cloud Shell to create a provisioning service and two IoT hubs representing the Contoso Toasters Division and the Contoso Heat Pumps division.
Tip
The commands used in this article create the provisioning service and other resources in the West US location. We recommend that you create your resources in the region nearest you that supports Device Provisioning Service. You can view a list of available locations by running the command
az provider show --namespace Microsoft.Devices --query 'resourceTypes[?resourceType'ProvisioningServices'].locations | [0]' --out table or by going to the Azure Status page and searching for 'Device Provisioning Service'. In commands, locations can be specified either in one word or multi-word format; for example: westus, West US, WEST US, etc. The value is not case sensitive. If you use multi-word format to specify location, enclose the value in quotes; for example, -- location 'West US' .
Create the custom allocation function
In this section, you create an Azure function that implements your custom allocation policy. This function decides which divisional IoT hub a device should be registered to based on whether its registration ID contains the string -contoso-tstrsd-007 or -contoso-hpsd-088. It also sets the initial state of the device twin based on whether the device is a toaster or a heat pump.
Create the enrollment
In this section, you'll create a new enrollment group that uses the custom allocation policy. For simplicity, this article uses Symmetric key attestation with the enrollment. For a more secure solution, consider using X.509 certificate attestation with a chain of trust.
Derive unique device keys
In this section, you create two unique device keys. One key will be used for a simulated toaster device. The other key will be used for a simulated heat pump device.
To generate the device key, you use the Primary Key you noted earlier to compute the HMAC-SHA256 of the device registration ID for each device and convert the result into Base64 format. For more information on creating derived device keys with enrollment groups, see the group enrollments section of Symmetric key attestation.
For the example in this article, use the following two device registration IDs and compute a device key for both devices. Both registration IDs have a valid suffix to work with the example code for the custom allocation policy:
Linux workstations
If you're using a Linux workstation, you can use openssl to generate your derived device keys as shown in the following example.
Windows-based workstations
If you're using a Windows-based workstation, you can use PowerShell to generate your derived device key as shown in the following example.
The simulated devices will use the derived device keys with each registration ID to perform symmetric key attestation.
Prepare an Azure IoT C SDK development environment
In this section, you prepare the development environment used to build the Azure IoT C SDK. The SDK includes the sample code for the simulated device. This simulated device will attempt provisioning during the device's boot sequence.
This section is oriented toward a Windows-based workstation. For a Linux example, see the set-up of the VMs in How to provision for multitenancy.
Simulate the devices
In this section, you update a provisioning sample named prov_dev_client_sample located in the Azure IoT C SDK you set up previously.
This sample code simulates a device boot sequence that sends the provisioning request to your Device Provisioning Service instance. The boot sequence will cause the toaster device to be recognized and assigned to the IoT hub using the custom allocation policy.
Simulate the Contoso toaster device
Simulate the Contoso heat pump device
Troubleshooting custom allocation policies
The following table shows expected scenarios and the results error codes you might receive. Use this table to help troubleshoot custom allocation policy failures with your Azure Functions.
Clean up resources
If you plan to continue working with the resources created in this article, you can leave them. If you don't plan to continue using the resources, use the following steps to delete all of the resources created in this article to avoid unnecessary charges.
The steps here assume you created all resources in this article as instructed in the same resource group named contoso-us-resource-group.
Important
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Deleting a resource group is irreversible. The resource group and all the resources contained in it are permanently deleted. Make sure that you don't accidentally delete the wrong resource group or resources. If you created the IoT Hub inside an existing resource group that contains resources you want to keep, only delete the IoT Hub resource itself instead of deleting the resource group.
To delete the resource group by name:
Next steps
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The Desktop Viewer is no longer supported. We recommend that you use mobile devices for previewing.
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Whenever a new set of tools is released, choose Help > Updates in InDesign and update the DPS Desktop Tools.
Choose About from the Folio Builder panel menu in InDesign, and note the last two digits.
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The DPS team does not plan to update the Adobe Content Viewer for Desktop (desktop preview tool) for previewing DPS content in InDesign. We recommend that you use on-device preview for a more accurate previewing experience.
'Please update your app' error message
When customers attempt to download new folios in your branded viewer app, the following message appears: 'Please update your app. This issue is available for download, but requires a newer version of the app.'
If customers are getting this error, the viewer version of the folio is higher than the viewer version of the app. To fix this problem, either publish the folio using an older viewer version that is compatible with your app, or submit a new version of your app to the store.
For details, see this article: http://helpx.adobe.com/digital-publishing-suite/kb/please-update-app-download-folio.html
'This version of DPS App Builder has expired' error message
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This message appears when you're trying to use an older version of DPS App Builder when a newer version is available. The solution is to install a new version of DPS App Builder.
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However, in some instances, this message continues to appear after you've re-installed DPS App Builder. First, make sure that you are using Mac OSX 10.7 or later; Mac OSX 10.6.8 is no longer supported. Also, make sure that you clean the cache in your web browser before downloading the newest version of DPS App Builder. In some instances, the browser cache leads to an older version of the installer to be downloaded.
'You do not have a compatible Digital Publishing Plug-in' error message
After updating your Folio Producer tools, this error message tells you to download the Folio Producer tools, but you have the most current Folio Producer tools and panel. This problem sometimes occur when there is a problem with the PlugInConfig.txt file. Moving or deleting this file usually resolves this issue. For details, see this tech note: http://helpx.adobe.com/digital-publishing-suite/kb/error-do-have-compatible-digital.html
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To uninstall the Folio Producer tools for InDesign CS 5 and CS 5.5, do either of the following:
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In InDesign CC, the digital publishing tools are integrated with InDesign. You can remove the DPS tools only by uninstalling InDesign.
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