MQTTnet.AspNetCore.AttributeRouting 0.3.16

dotnet add package MQTTnet.AspNetCore.AttributeRouting --version 0.3.16                
NuGet\Install-Package MQTTnet.AspNetCore.AttributeRouting -Version 0.3.16                
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="MQTTnet.AspNetCore.AttributeRouting" Version="0.3.16" />                
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add MQTTnet.AspNetCore.AttributeRouting --version 0.3.16                
#r "nuget: MQTTnet.AspNetCore.AttributeRouting, 0.3.16"                
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install MQTTnet.AspNetCore.AttributeRouting as a Cake Addin
#addin nuget:?package=MQTTnet.AspNetCore.AttributeRouting&version=0.3.16

// Install MQTTnet.AspNetCore.AttributeRouting as a Cake Tool
#tool nuget:?package=MQTTnet.AspNetCore.AttributeRouting&version=0.3.16                

NuGet Badge License: MIT

MQTTnet AspNetCore AttributeRouting

This addon to MQTTnet provides the ability to define controllers and use attribute-based routing against message topics in a manner that is very similar to AspNet Core.

When should I use this library?

This library is a completely optional addon to MQTTnet (i.e. it is never required). You would WANT to use this if:

  • Your primary use case is validating/processing the MQTT messages on your server
  • Your server is not primarily sending data to clients via MQTT
  • You appreciate encapsulating your message processing logic in controllers in a way similar to AspNetCore and WebAPI

You can do everything that this addon does directly by using MQTTnet delegates yourself. However, as the amount of logic you write to validate or process incoming messages grows, the ability to organize your logic into controllers start to make much more sense. This library helps with organizing that code as well as bringing together your dependency injection framework to MQTTnet.


  • Encapsulate your incoming message logic in controllers
  • Use familiar paradigms from AspNetCore in your MQTT logic (Controllers and Actions)
  • First-class support for dependency injection using existing ServiceProvider implementaiton in your AspNetCore project
  • Support for sync and async/await Actions on your controllers
  • Use together with any other MQTTnet options

Performance Note

This library has not been tested against a very high-load environment yet. Ensure you do your own load testing prior to use in production. All performance improvement PRs are welcome.

Supported frameworks

  • .NET Standard 2.0+
  • .NET Core 3.1+

Supported MQTT versions

  • 5.0.0
  • 3.1.1
  • 3.1.0


This library is available as a nuget package:


Install this package and MQTTnet from nuget.

Modify your Startup.cs with the following options:

public void ConfigureServices(IServiceCollection services)
	// ... All your other configuration ...

	// Identify and build routes
			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.

		.AddHostedMqttServerWithServices(s =>
			// Optionally set server options here

			// Enable Attribute routing
					By default, messages published to topics that don't
					match any routes are rejected. Change this to true
					to allow those messages to be routed without hitting
					any controller actions.
				allowUnmatchedRoutes: false

Create your controllers by inheriting from MqttBaseController and adding actions to it like so:

[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
	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();

See a full example project here


Contributions are welcome. Please open an issue to discuss your idea prior to sending a PR.

MIT License


About Atlas LiftTech

This library is sponsored by Atlas Lift Tech. Atlas Lift Tech is a safe patient handling and mobility (SPHM) solution provider, helping hospitals improve patient outcomes and improve patient mobility.

Product Compatible and additional computed target framework versions.
.NET net5.0 is compatible.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp2.0 was computed.  netcoreapp2.1 was computed.  netcoreapp2.2 was computed.  netcoreapp3.0 was computed.  netcoreapp3.1 is compatible. 
.NET Standard netstandard2.0 is compatible.  netstandard2.1 was computed. 
.NET Framework net461 was computed.  net462 was computed.  net463 was computed.  net47 was computed.  net471 was computed.  net472 was computed.  net48 was computed.  net481 was computed. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen40 was computed.  tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages

This package is not used by any NuGet packages.

GitHub repositories

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Version Downloads Last updated
0.3.16 8,201 10/18/2021
0.3.15 1,848 5/12/2021
0.3.14 641 2/12/2021
0.3.13 1,639 10/27/2020
0.3.0 1,550 8/14/2020
0.2.0 514 8/13/2020
0.1.0 549 8/12/2020

* Added support for passing an array of assemblies to use in route discovery