MQTTnet AspNetCore Routing

dotnet add package MQTTnet.AspNetCore.Routing

using MQTTnet.AspNetCore;
using MQTTnet.AspNetCore.Routing;

var builder = WebApplication.CreateBuilder(args);
builder.WebHost.ConfigureKestrel(o =>
    {
        o.ListenAnyIP(iotaboardMqttSettings.Port, l => l.UseMqtt());
        o.ListenAnyIP(iotaboardHttpSettings.Port);
    }
);

// Configure MQTTServer service
builder.Services
    .AddHostedMqttServerWithServices(o =>
    {
        // other configurations
        o.WithoutDefaultEndpoint();
    })
    .AddMqttConnectionHandler()
    .AddConnections()
    .AddMqttControllers( // <== NOTICE THIS PART
    /*
        By default, all controllers within the executing assembly are
        discovered (just pass nothing here). To provide a list of assemblies
        explicitly, pass an array of Assembly[] here.
    */)
    /*
        optionally, set System.Text.Json serialization default for use with 
        [FromPayload] in the controllers. We can specify a JsonSerializerOptions
        or use JsonSerializerDefaults, useful for case-sensitivity or comment-handling
    */
    .AddMqttDefaultJsonOptions(new JsonSerializerOptions(JsonSerializerDefaults.Web)); 
    
var app = builder.Build();

app.MapControllers();
app.UseMqttServer(server => {  
    // other MqttServer configurations, for example client connect intercepts
    server.WithAttributeRouting(app.Services, allowUnmatchedRoutes: false);
});
app.Run();

[MqttController]
[MqttRoute("[controller]")] // Optional route prefix
public class MqttWeatherForecastController : MqttBaseController // Inherit from MqttBaseController for convenience functions
{
	private readonly ILogger<MqttWeatherForecastController> _logger;

	// Controllers have full support for dependency injection just like AspNetCore controllers
	public MqttWeatherForecastController(ILogger<MqttWeatherForecastController> logger)
	{
		_logger = logger;
	}

	// Supports template routing with typed constraints just like AspNetCore
	// Action routes compose together with the route prefix on the controller level
	[MqttRoute("{zipCode:int}/temperature")]
	public Task WeatherReport(int zipCode)
	{
		// We have access to the MqttContext
		if (zipCode != 90210) { MqttContext.CloseConnection = true; }

		// We have access to the raw message
		var temperature = BitConverter.ToDouble(Message.Payload);

		_logger.LogInformation($"It's {temperature} degrees in Hollywood");

		// Example validation
		if (temperature <= 0 || temperature >= 130)
		{
			return BadMessage();
		}

		return Ok();
	}
	
	// Supports binding JSON message payload to parameters with [FromPayload] attribute,
	// Similar to ASP.NET Core [FromBody]
	[MqttRoute("{deviceName}/telemetry")]
	public async Task NewTelemetry(string deviceName, [FromPayload] Telemetry telemetry)
	{
	    // here telemetry is JSON-deserialized from message payload to type Telemetry
		bool success = await DoSomething(telemetry);
		if (success) {
		    await Ok();
		    return;
		}
		else {
		    await BadMessage();
		    return;
		}
	}
}