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Send telemetry to Azure IoT Hub quickstart (Android) | Microsoft Docs
In this quickstart, you run a sample Android application to send simulated telemetry to an IoT hub and to read telemetry from the IoT hub for processing in the cloud.
wesmc7777
philmea
iot-hub
iot-hub
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quickstart
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03/15/2019
wesmc

Quickstart: Send IoT telemetry from an Android device

[!INCLUDE iot-hub-quickstarts-1-selector]

In this quickstart, you send telemetry to an Azure IoT Hub from an Android application running on a physical or simulated device. IoT Hub is an Azure service that enables you to ingest high volumes of telemetry from your IoT devices into the cloud for storage or processing. This quickstart uses a pre-written Android application to send the telemetry. The telemetry will be read from the IoT Hub using the Azure Cloud Shell. Before you run the application, you create an IoT hub and register a device with the hub.

Prerequisites

[!INCLUDE cloud-shell-try-it.md]

Add Azure IoT Extension

Run the following command to add the Microsoft Azure IoT Extension for Azure CLI to your Cloud Shell instance. The IOT Extension adds IoT Hub, IoT Edge, and IoT Device Provisioning Service (DPS) specific commands to Azure CLI.

az extension add --name azure-iot

[!INCLUDE iot-hub-cli-version-info]

Create an IoT hub

[!INCLUDE iot-hub-include-create-hub]

Register a device

A device must be registered with your IoT hub before it can connect. In this quickstart, you use the Azure Cloud Shell to register a simulated device.

  1. Run the following command in Azure Cloud Shell to create the device identity.

    YourIoTHubName: Replace this placeholder below with the name you chose for your IoT hub.

    MyAndroidDevice: This is the name of the device you're registering. It's recommended to use MyAndroidDevice as shown. If you choose a different name for your device, you'll also need to use that name throughout this article, and update the device name in the sample applications before you run them.

    az iot hub device-identity create --hub-name {YourIoTHubName} --device-id MyAndroidDevice

  2. Run the following command in Azure Cloud Shell to get the device connection string for the device you just registered:

    YourIoTHubName: Replace this placeholder below with the name you chose for your IoT hub.

    az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyAndroidDevice --output table

    Make a note of the device connection string, which looks like:

    HostName={YourIoTHubName}.azure-devices.net;DeviceId=MyAndroidDevice;SharedAccessKey={YourSharedAccessKey}

    You'll use this value later in this quickstart to send telemetry.

Send simulated telemetry

  1. Open the GitHub sample Android project in Android Studio. The project is located in the following directory of your cloned or downloaded copy of azure-iot-sample-java repository: \azure-iot-samples-java\iot-hub\Samples\device\AndroidSample.

  2. In Android Studio, open gradle.properties for the sample project and replace the Device_Connection_String placeholder with the device connection string you made a note of earlier.

    DeviceConnectionString=HostName={YourIoTHubName}.azure-devices.net;DeviceId=MyAndroidDevice;SharedAccessKey={YourSharedAccessKey}

  3. In Android Studio, click File > Sync Project with Gradle Files. Verify the build completes.

    [!NOTE] If the project sync fails, it may be for one of the following reasons:

    • The versions of the Android Gradle plugin and Gradle referenced in the project are out of date for your version of Android Studio. Follow these instructions to reference and install the correct versions of the plugin and Gradle for your installation.
    • The license agreement for the Android SDK has not been signed. Follow the instructions in the Build output to sign the license agreement and download the SDK.

  4. Once the build has completed, click Run > Run 'app'. Configure the app to run on a physical Android device or an Android emulator. For more information on running an Android app on a physical device or emulator, see Run your app.

  5. Once the app loads, click the Start button to start sending telemetry to your IoT Hub:

    Application

Read the telemetry from your hub

In this section, you will use the Azure Cloud Shell with the IoT extension to monitor the device messages that are sent by the Android device.

  1. Using the Azure Cloud Shell, run the following command to connect and read messages from your IoT hub:

    YourIoTHubName: Replace this placeholder below with the name you chose for your IoT hub.

    az iot hub monitor-events --hub-name {YourIoTHubName} --output table

    The following screenshot shows the output as the IoT hub receives telemetry sent by the Android device:

    Read the device messages using the Azure CLI

Clean up resources

[!INCLUDE iot-hub-quickstarts-clean-up-resources]

Next steps

In this quickstart, you set up an IoT hub, registered a device, sent simulated telemetry to the hub using an Android application, and read the telemetry from the hub using the Azure Cloud Shell.

To learn how to control your simulated device from a back-end application, continue to the next quickstart.

[!div class="nextstepaction"] Quickstart: Control a device connected to an IoT hub