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.
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
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.
- .NET Standard 2.0+
- .NET Core 3.1+
- 5.0.0
- 3.1.1
- 3.1.0
This library is available as a nuget package: https://www.nuget.org/packages/MQTTnet.AspNetCore.AttributeRouting/
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
services.AddMqttControllers(
/*
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.
*/
);
services
.AddHostedMqttServerWithServices(s =>
{
// Optionally set server options here
s.WithoutDefaultEndpoint();
// Enable Attribute routing
s.WithAttributeRouting(
/*
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
);
})
.AddMqttConnectionHandler()
.AddConnections();
}Create your controllers by inheriting from MqttBaseController and adding actions to it like so:
[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();
}
}See server example project here
See client example project here
Contributions are welcome. Please open an issue to discuss your idea prior to sending a PR.
See https://github.com/Atlas-LiftTech/MQTTnet.AspNetCore.AttributeRouting/LICENSE.
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.