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|Setup |Getting Started |Telemetry |Command |

These samples provide guidance to build Pub/Sub applications targeting MQTT Brokers in different programming languages. The samples are provided in these programming languages:

• C#
• C
• Go
• Python
• TypeScript
• Rust

The instructions are provided for the following MQTT Brokers:

• Azure Event Grid Namespaces
• Mosquitto for local development

Note: These samples can also be leveraged for any MQTT Broker that supports X509 certificates authentication

• You can test the samples locally on your machine or inGithub Codespaces:
  • To test in Github Codespaces:
    • Click on theCode button on the top right of the page
    • select theCodespaces tab, then click + to create a new codespace
  • To test locally on your machine:
    • Use a Linux environment as the samples are optimized to run in Linux.
      • To install and run Linux on Windows, runwsl --install -d Ubuntu. After installation is complete, you can runwsl to start running commands on your Ubuntu subsystem whenever you open a new terminal window.Learn more
      • Note: To run in native Windows, you must adapt the scripts to use Windows paths.
    • Clone this repository to any directory in your Linux environment:git clone https://github.com/Azure-Samples/MqttApplicationSamples.git
• Follow the instructions in theSetup to setup your environment.
• Navigate to each of the scenario folders and follow its README.md instructions to run the scenario.
  • To configure the MQTT connection, the samples use.env files, with variables to specify the host name, port, certificates, etc. The.env files must be located in the scenario folder, e.g.scenarios/getting_started, and can be reused across samples/languages, including the client certificates.

Each language requires developer tools, such as compilers and SDKs to build and run the samples:

• dotnet
• C
• Go
• Python (TBD)
• TypeScript
• Rust (TBD)

These samples implement PubSub patterns used in MQTT Applications.

Each scenario involves a different number of producers and consumers. These producers and consumers are loosely coupled actors that interact with the MQTT broker using a specific topic structure and known message payloads.

Each scenario requires the following configurations:

• Configure Authentication: mTLS certificates and clients.
• Configure Authorization: Define which client(s) can interact with which topic(s).

Follow the instructions in thePrerequisites to configure these scenarios.

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