Monitor device connectivity using Azure CLI

Use the Azure CLI IoT extension to:

  • See the messages your devices are sending to IoT Central.
  • Observe changes in the device twin.
  • Diagnose issues where device messages don't reach the cloud.
  • Diagnose issues where devices don't respond 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

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 0.14.1 or higher. If it isn't, 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.

Sign in

Start by signing into the Azure CLI:

az login

Get the Application ID of your IoT Central app

In Application > Management, 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 learn Troubleshoot why data from your devices isn't showing up in Azure IoT Central.