Monitor device connectivity using Azure CLI

Use the Azure CLI IoT extension to see messages your devices are sending to IoT Central and observe changes in the device twin. You can use this tool to debug and observe device connectivity and diagnose issues of device messages not reaching the cloud or devices not responding to twin changes.

Visit the Azure CLI extensions reference for more details


A work or school account in Azure, added as a user in an IoT Central application.

Prepare your environment for the Azure CLI

  • Use the Bash environment in Azure Cloud Shell.

    Launch Cloud Shell in a new window

  • If you prefer, install the Azure CLI to run CLI reference commands.

    • If you're using a local installation, sign in to the Azure CLI by using the az login command. To finish the authentication process, follow the steps displayed in your terminal. For additional sign-in options, see Sign in with the Azure CLI.

    • When you're prompted, install Azure CLI extensions on first use. For more information about extensions, see Use extensions with the Azure CLI.

    • Run az version to find the version and dependent libraries that are installed. To upgrade to the latest version, run az upgrade.

Install the IoT Central extension

Run the following command from your command line to install:

az extension add --name azure-iot

Check the version of the extension by running:

az --version

You should see the azure-iot extension is 0.9.9 or higher. If it is not, run:

az extension update --name azure-iot

Using the extension

The following sections describe common commands and options that you can use when you run az iot central. To view the full set of commands and options, pass --help to az iot central or any of its subcommands.


Start by signing into the Azure CLI.

az login

Get the Application ID of your IoT Central app

In Administration/Application Settings, copy the Application ID. You use this value in later steps.

Monitor messages

Monitor the messages that are being sent to your IoT Central app from your devices. The output includes all headers and annotations.

az iot central diagnostics monitor-events --app-id <app-id> --properties all

View device properties

View the current read and read/write device properties for a given device.

az iot central device twin show --app-id <app-id> --device-id <device-id>

Next steps

A suggested next step is to read about Device connectivity in Azure IoT Central.