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Azure IoT Device Simulator - How To

How to use the Azure IoT Device Simulator?

The IoT simulator can easily be containerized in order to simplify its delivery and use. Also, .NET 6 includes interesting capabilities to build lighter and/or selfsufficient applications (ex: selfcontained with trim build options).

If you need detailed documentation about what Azure IoT Device Simulator is, you can find additional information at:

Prerequisites

Ports used by the simulator:

  • 8883 (MQTT)
  • 5671 (AMQP)
  • 443 (HTTPS) Ports required to communicate with Microsoft Azure IoT Hub.

Step by step

The Azure IoT Device Simulator needs two basic prerequisites before starting:

  • settings (do not forget to update the connection strings)
  • the referenced DTDL models have to be reachable (from the device as well as from the cloud solution)

Settings

Settings are based on 3 files:

For details and explanations, see help.

Tip

The solution takes into account settings depending on the environment. It can be set trough the environment variable ENVIRONMENT. The solution looks for settings files following the pattern file.ENVIRONMENT.json (similar to the former transformation files). Default setting files will be loaded first in case no environment file is found.

appsettings.json

This file allows configuring system related items (logs, etc).

Release

Minimal logs settings.

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  }
}

Development (appsettings.Development.json)

Detailed logs settings.

{
  "Logging": {
    "Debug": {
      "LogLevel": {
        "Default": "Trace"
      }
    },
    "Console": {
      "IncludeScopes": true,
      "LogLevel": {
        "Default": "Trace"
      }
    },
    "LogLevel": {
      "Default": "Trace",
      "System": "Trace",
      "Microsoft": "Trace"
    }
  }
}
devicesettings.json

This file allows to configure the device simulation settings.

{
  "connectionString": "[IOT HUB NAME].azure-devices.net;DeviceId=[DEVIVE ID];SharedAccessKey=[SHARED KEY]",
  "defaultModelId": "dtmi:com:example:thermostat;1",
  "supportedModels": [
    {
      "modelId": "dtmi:com:example:thermostat;1",
      "modelPath": "[HTTP path or local physical path to the model definition]",
      "modelType": "Telemetry" //Telemetry, Error, Warning
    },
    {
      "modelId": "dtmi:com:jmi:simulator:devicemessages;1",
      "modelPath": "[HTTP path or local physical path to the model definition]",
      "modelType": "Telemetry" //Telemetry, Error, Warning
    }
  ],
  "simulationSettings": {
    "enableLatencyTests": false,
    "latencyTestsFrecuency": 30,
    "enableDevice": true,
    "enableModules": false,
    "enableTelemetryMessages": true,
    "telemetryFrecuency": 10,
    "enableErrorMessages": false,
    "errorFrecuency": 20,
    "enableCommissioningMessages": false,
    "commissioningFrecuency": 30,
    "enableTwinReportedMessages": false,
    "twinReportedMessagesFrecuency": 60,
    "enableReadingTwinProperties": false,
    "enableC2DDirectMethods": true,
    "enableC2DMessages": true,
    "enableTwinPropertiesDesiredChangesNotifications": true
  }
}
modulessettings.json

This file allows to configure the module(s) simulation settings.

{
 "modules":[
    {
        "connectionString": "[IOT HUB NAME].azure-devices.net;DeviceId=[DEVIVE ID];ModuleId=[MODULE ID];SharedAccessKey=[SHARED KEY]",
        "defaultModelId": "dtmi:com:example:thermostat;1",
        "supportedModels": [
          {
            "modelId": "dtmi:com:example:thermostat;1",
            "modelPath": "./DTDLModels/thermostat.json",
            "modelType": "Telemetry"
          }
        ],
        "simulationSettings": {
          "enableTelemetryMessages": true,
          "telemetryFrecuency": 20,
          "enableTwinReportedMessages": false,
          "twinReportedMessagesFrecuency": 60,
          "enableReadingTwinProperties": true,
          "enableC2DDirectMethods": true,
          "enableC2DMessages": true,
          "enableTwinPropertiesDesiredChangesNotifications": true
        }
    },
    {
        "connectionString": "[IOT HUB NAME].azure-devices.net;DeviceId=[DEVIVE ID];ModuleId=[MODULE ID];SharedAccessKey=[SHARED KEY]",
        "defaultModelId": "dtmi:com:example:thermostat;1",
        "supportedModels": [
          {
            "modelId": "dtmi:com:example:thermostat;1",
            "modelPath": "./DTDLModels/thermostat.json",
            "modelType": "Telemetry"
          }
        ],
        "simulationSettings": {
          "enableTelemetryMessages": true,
          "telemetryFrecuency": 20,
          "enableTwinReportedMessages": false,
          "twinReportedMessagesFrecuency": 60,
          "enableReadingTwinProperties": true,
          "enableC2DDirectMethods": true,
          "enableC2DMessages": true,
          "enableTwinPropertiesDesiredChangesNotifications": true
        }
    }
  ]
}

Important

Do not forget to set your own values for the connectionString parameter.

Commands

Regular

dotnet IoT.Simulator.dll

Changing the environment

Linux

export ENVIRONMENT=Development
dotnet IoT.Simulator.dll

Windows

set ENVIRONMENT=Development
dotnet IoT.Simulator.dll