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Using dotnet samples

These samples are based on MQTTnet

MQTTnet extensions

To avoid duplicating the code in each scenario, the MQTTnet.Client.Extensions provide extension methods to configure MQTTnet from .env files:

  • MqttConnectionSettings allows to load the settings from .env files
  • WithConnectionSettings is an extension method to MqttClientOptionsBuilder to open a connection from the loaded settings.
var cs = MqttConnectionSettings.CreateFromEnvVars();
var mqttClient = new MqttFactory().CreateMqttClient(MqttNetTraceLogger.CreateTraceLogger());
var connAck = await mqttClient!.ConnectAsync(new MqttClientOptionsBuilder().WithConnectionSettings(cs).Build());

Loading EnvVars

The samples will try to load the known environment variables and additionally will set those variables from .env files following the next order

  • Passing a --envFile to the samples will force to load those settings
  • When --envFile is not set, the program will try to load a .env file in the $cwd
  • In all cases, the program will try to load the variables from the EnvVars available in the shell process.

Tracing

Note the mqttClient is initialized with a trace logger MqttNetTraceLogger that will show traces on the output debug string, to redirect these traces to the main console output configure a ConsoleTraceListener:

System.Diagnostics.Trace.Listeners.Add(new System.Diagnostics.ConsoleTraceListener());