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Send telemetry to Azure IoT Hub quickstart | Microsoft Docs
In this quickstart, you run a sample iOS application to send simulated telemetry to an IoT hub and to read telemetry from the IoT hub for processing in the cloud.
kgremban
timlt
iot-hub
iot-hub
quickstart
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04/20/2018
kgremban

Quickstart: Send telemetry from a device to an IoT hub (iOS)

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

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. In this article, you send telemetry from a simulated device application to IoT Hub. Then you can view the data from a back-end application.

This article uses a pre-written Swift application to send the telemetry and a CLI utility to read the telemetry from IoT Hub.

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

If you don’t have an Azure subscription, create a free account before you begin.

Prerequisites

  • Download the code sample from Azure samples
  • The latest version of XCode, running the latest version of the iOS SDK. This quickstart was tested with XCode 9.3 and iOS 11.3.
  • The latest version of CocoaPods.

Create an IoT hub

[!INCLUDE iot-hub-quickstarts-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 CLI to register a simulated device.

  1. Add the IoT Hub CLI extension and create the device identity. Replace {YourIoTHubName} with a name for your IoT hub:

    az extension add --name azure-cli-iot-ext
az iot hub device-identity create --hub-name {YourIoTHubName} --device-id myiOSdevice

    If you choose a different name for your device, update the device name in the sample applications before you run them.

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

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

    Make a note of the device connection string, which looks like Hostname=...=. You use this value later in the article.

Send simulated telemetry

The sample application runs on an iOS device, which connects to a device-specific endpoint on your IoT hub and sends simulated temperature and humidity telemetry.

Install CocoaPods

CocoaPods manage dependencies for iOS projects that use third-party libraries.

In a terminal window, navigate to the Azure-IoT-Samples-iOS folder that you downloaded in the prerequisites. Then, navigate to the sample project:

cd quickstart/sample-device

Make sure that XCode is closed, then run the following command to install the CocoaPods that are declared in the podfile file:

pod install

Along with installing the pods required for your project, the installation command also created an XCode workspace file that is already configured to use the pods for dependencies.

Run the sample application

  1. Open the sample workspace in XCode.

    open "MQTT Client Sample.xcworkspace"

  2. Expand the MQTT Client Sample project and then expand the folder of the same name.

  3. Open ViewController.swift for editing in XCode.

  4. Search for the connectionString variable and update the value with the device connection string that you made a note of previously.

  5. Save your changes.

  6. Run the project in the device emulator with the Build and run button or the key combo command + r.

    Run the project

  7. When the emulator opens, select Start in the sample app.

The following screenshot shows some example output as the application sends simulated telemetry to your IoT hub:

Run the simulated device

Read the telemetry from your hub

The sample app that you ran on the XCode emulator shows data about messages sent from the device. You can also view the data through your IoT hub as it is received. The IoT Hub CLI extension can connect to the service-side Events endpoint on your IoT Hub. The extension receives the device-to-cloud messages sent from your simulated device. An IoT Hub back-end application typically runs in the cloud to receive and process device-to-cloud messages.

Run the following Azure CLI commands, replacing {YourIoTHubName} with the name of your IoT hub:

az iot hub monitor-events --device-id myiOSdevice --hub-name {YourIoTHubName}

The following screenshot shows the output as the extension receives telemetry sent by the simulated device to the hub:

The following screenshot shows the type of telemetry that you see in your terminal window:

View telemetry

Clean up resources

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

Next steps

In this article, you set up an IoT hub, registered a device, sent simulated telemetry to the hub from an iOS device, and read the telemetry from the hub.

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