azure-iot-sdk-python/samples

Samples for the Azure IoT Hub Device SDK

This directory contains samples showing how to use the various features of the Microsoft Azure IoT Hub service from a device running the Azure IoT Hub Device SDK.

Quick Start - Simple Telemetry Sample (send message)

Note that this sample is configured for Python 3.7+. To ensure that your Python version is up to date, run python --version. If you have both Python 2 and Python 3 installed (and are using a Python 3 environment for this SDK), then install all libraries using pip3 as opposed to pip. This ensures that the libraries are installed to your Python 3 runtime.

1. Install the Azure CLI (or use the Azure Cloud Shell) and use it to create an Azure IoT Hub.

   az iot hub create --resource-group <your resource group> --name <your IoT Hub name>
   

   • Note that this operation may take a few minutes.

2. Add the IoT Extension to the Azure CLI, and then register a device identity

   az extension add --name azure-iot
   az iot hub device-identity create --hub-name <your IoT Hub name> --device-id <your device id>
   

3. Retrieve your Device Connection String using the Azure CLI

   az iot hub device-identity connection-string show --device-id <your device id> --hub-name <your IoT Hub name>
   

   It should be in the format:

   HostName=<your IoT Hub name>.azure-devices.net;DeviceId=<your device id>;SharedAccessKey=<some value>
   

4. Begin monitoring for telemetry on your IoT Hub using the Azure CLI

   az iot hub monitor-events --hub-name <your IoT Hub name> --output json
   

5. On your device, set the Device Connection String as an environment variable called IOTHUB_DEVICE_CONNECTION_STRING.

   Windows (cmd)

   set IOTHUB_DEVICE_CONNECTION_STRING=<your connection string here>
   

   • Note that there are NO quotation marks around the connection string.

   Linux (bash)

   export IOTHUB_DEVICE_CONNECTION_STRING="<your connection string here>"
   

6. Once the Device Connection String is set, run the following code from simple_send_message.py on your device from the terminal or your IDE:

   import os
   import asyncio
   from azure.iot.device.aio import IoTHubDeviceClient
   
   
   async def main():
       # Fetch the connection string from an environment variable
       conn_str = os.getenv("IOTHUB_DEVICE_CONNECTION_STRING")
   
       # Create instance of the device client using the authentication provider
       device_client = IoTHubDeviceClient.create_from_connection_string(conn_str)
   
       # Connect the device client.
       await device_client.connect()
   
       # Send a single message
       print("Sending message...")
       await device_client.send_message("This is a message that is being sent")
       print("Message successfully sent!")
   
       # finally, shut down the client
       await device_client.shutdown()
   
   
   if __name__ == "__main__":
       asyncio.run(main())
   

7. Check the Azure CLI output to verify that the message was received by the IoT Hub. You should see the following output:

   Starting event monitor, use ctrl-c to stop...
   event:
     origin: <your Device name>
     payload: This is a message that is being sent
   

8. Your device is now able to connect to Azure IoT Hub!

Read this if you want to run the sample using GitHub Codespaces

You can use Github Codespaces to be up and running quickly! Here are the steps to follow.

1) Make sure you have the prerequisites

In order to run the device samples you will first need the following prerequisites:

• An Azure IoT Hub instance. Link if you don't.
• A device identity for your device. Link if you don't.

2) Create and open Codespace

• Select the Codespaces tab and the "New codespace" button

  

• Once the Codespace is open, all required packages to run the samples will be setup for you

3) Set the DEVICE_CONNECTION_STRING environment variable

Set the Device Connection String as an environment variable called IOTHUB_DEVICE_CONNECTION_STRING.

export IOTHUB_DEVICE_CONNECTION_STRING="<YourIoTHubConnectionString>"

4) Run it

Run the sample using the following commands:

cd azure-iot-device/samples
python3 simple_send_message.py

Additional Samples

Further samples with more complex IoT Hub scenarios are contained in the async-hub-scenarios directory, including:

• Send multiple telemetry messages from a Device
• Receive Cloud-to-Device (C2D) messages on a Device
• Send and receive updates to device twin
• Receive direct method invocations
• Upload file into an associated Azure storage account

Further samples with more complex IoT Edge scenarios involving IoT Edge modules and downstream devices are contained in the async-edge-scenarios directory, including:

• Send multiple telemetry messages from a Module
• Receive input messages on a Module
• Send messages to a Module Output
• Send messages to IoT Edge from a downstream or 'leaf' device

Samples for the synchronous clients are contained in the sync-samples directory.

Samples for use of Azure IoT Plug and Play are contained in the pnp directory.