Quickstart: Create and provision a simulated TPM device using Java device SDK for Azure IoT Hub Device Provisioning Service

Article
03/31/2023

In this quickstart, you create a simulated IoT device on a Windows computer. The simulated device includes a TPM simulator as a Hardware Security Module (HSM). You use device sample Java code to connect this simulated device with your IoT hub using an individual enrollment with the Device Provisioning Service (DPS).

Prerequisites

Familiar with provisioning concepts.
Completion of Set up IoT Hub Device Provisioning Service with the Azure portal.
An Azure account with an active subscription. Trial Subscription.
Java SE Development Kit 8.
Maven.
Git.

Note

The initial device twin state configuration is available only in the standard tier of IoT Hub. For more information about the basic and standard IoT Hub tiers, see How to choose the right IoT Hub tier.

Prepare the environment

Make sure you have Java SE Development Kit 8 installed on your machine.
Download and install Maven.
Make sure git is installed on your machine and is added to the environment variables accessible to the command window. See Software Freedom Conservancy's Git client tools for the latest version of git tools to install, which includes the Git Bash, the command-line app that you can use to interact with your local Git repository.
Open a command prompt. Clone the GitHub repo for device simulation code sample.
```
git clone https://github.com/Azure/azure-iot-sdk-java.git --recursive
```
Run the TPM simulator to be the HSM for the simulated device. Click Allow access to allow changes to Windows Firewall settings. It listens over a socket on ports 2321 and 2322. Do not close this window; you need to keep this simulator running until the end of this quickstart guide.
```
.\azure-iot-sdk-java\provisioning\provisioning-tools\tpm-simulator\Simulator.exe
```
In a separate command prompt, navigate to the root folder and build the sample dependencies.
```
cd azure-iot-sdk-java
mvn install -DskipTests=true
```

Navigate to the sample folder.

cd provisioning/provisioning-samples/provisioning-tpm-sample

Sign in to the Azure portal, select the All resources button on the left-hand menu and open your Device Provisioning service. Note your ID Scope and Provisioning Service Global Endpoint.

Edit src/main/java/samples/com/microsoft/azure/sdk/iot/ProvisioningTpmSample.java to include your ID Scope and Provisioning Service Global Endpoint as noted before.

private static final String idScope = "[Your ID scope here]";
private static final String globalEndpoint = "[Your Provisioning Service Global Endpoint here]";
private static final ProvisioningDeviceClientTransportProtocol PROVISIONING_DEVICE_CLIENT_TRANSPORT_PROTOCOL = ProvisioningDeviceClientTransportProtocol.HTTPS;

Save the file.

Use the following commands to build the project, navigate to the target folder, and execute the created .jar file. Replace the version placeholder with your version of Java.
```
mvn clean install
cd target
java -jar ./provisioning-tpm-sample-{version}-with-deps.jar
```
The program begins running. Note the Endorsement key and Registration ID for the next section and leave the program running.

Create a device enrollment entry

The Azure IoT Device Provisioning Service supports two types of enrollments:

Enrollment groups: Used to enroll multiple related devices.
Individual enrollments: Used to enroll a single device.

This article demonstrates individual enrollments.

Sign in to the Azure portal, select the All resources button on the left-hand menu and open your Device Provisioning service.
From the Device Provisioning Service menu, select Manage enrollments. Select Individual Enrollments tab and select the Add individual enrollment button at the top.
In the Add Enrollment panel, enter the following information:
- Select TPM as the identity attestation Mechanism.
- Enter the Registration ID and Endorsement key for your TPM device from the values you noted previously.
- Select an IoT hub linked with your provisioning service.
- Optionally, you may provide the following information:
  - Enter a unique Device ID. Make sure to avoid sensitive data while naming your device. If you choose not to provide one, the registration ID will be used to identify the device instead.
  - Update the Initial device twin state with the desired initial configuration for the device.
- Once complete, press the Save button.
On successful enrollment, the Registration ID of your device appears in the list under the Individual Enrollments tab.

Simulate the device

On the command window running the Java sample code on your machine, press Enter to continue running the application. Notice the messages that simulate the device booting and connecting to the Device Provisioning Service to get your IoT hub information.
On successful provisioning of your simulated device to the IoT hub linked with your provisioning service, the device ID appears on the hub's IoT devices blade.

If you changed the initial device twin state from the default value in the enrollment entry for your device, it can pull the desired twin state from the hub and act accordingly. For more information, see Understand and use device twins in IoT Hub.

Clean up resources

If you plan to continue working on and exploring the device client sample, do not clean up the resources created in this quickstart. If you do not plan to continue, use the following steps to delete all resources created by this quickstart.

Close the device client sample output window on your machine.
Close the TPM simulator window on your machine.
From the left-hand menu in the Azure portal, select All resources and then select your Device Provisioning service. Open the Manage Enrollments blade for your service, and then select the Individual Enrollments tab. Select the check box next to the REGISTRATION ID of the device you enrolled in this quickstart, and press the Delete button at the top of the pane.
From the left-hand menu in the Azure portal, select All resources and then select your IoT hub. Open the IoT devices blade for your hub, select the check box next to the DEVICE ID of the device you registered in this quickstart, and then press the Delete button at the top of the pane.

Next steps

In this quickstart, you’ve created a TPM simulated device on your machine and provisioned it to your IoT hub using the IoT Hub Device Provisioning Service. To learn how to enroll your TPM device programmatically, continue to the quickstart for programmatic enrollment of a TPM device.

Azure quickstart - Enroll TPM device to Azure IoT Hub Device Provisioning Service