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MQTTnet

MQTTnet is a high performance .NET library for MQTT based communication. It provides a MQTT client and a MQTT server (broker). The implementation is based on the documentation from http://mqtt.org/.

Features

General

Async support
TLS 1.2 support for client and server (but not UWP servers)
Extensible communication channels (i.e. In-Memory, TCP, TCP+TLS, WS)
Lightweight (only the low level implementation of MQTT, no overhead)
Performance optimized (processing ~27.000 messages / second)*
Interfaces included for mocking and testing
Access to internal trace messages
Unit tested (70+ tests)

* Tested on local machine with MQTTnet client and server running in the same process using the TCP channel. The app for verification is part of this repository and stored in /Tests/MQTTnet.TestApp.NetCore.

Client

Communication via TCP (+TLS) or WS (WebSocket) supported
Included core MqttClient with low level functionality
Also included ManagedMqttClient which maintains the connection and subscriptions automatically. Also application messages are queued and re-scheduled for higher QoS levels automatically.
Rx support (via another project)
Compatible with Microsoft Azure IoT Hub

Server (broker)

List of connected clients available
Supports connected clients with different protocol versions at the same time
Able to publish its own messages (no loopback client required)
Able to receive every message (no loopback client required)
Extensible client credential validation
Retained messages are supported including persisting via interface methods (own implementation required)
WebSockets supported (via ASP.NET Core 2.0, separate nuget)
A custom message interceptor can be added which allows transforming or extending every received application message

Supported frameworks

.NET Standard 1.3+
.NET Core 1.1+
.NET Core App 1.1+
.NET Framework 4.5.2+ (x86, x64, AnyCPU)
Universal Windows (UWP) 10.0.10240+ (x86, x64, ARM, AnyCPU)
Mono 5.2+

Supported MQTT versions

3.1.1
3.1.0

Nuget

This library is available as a nuget package: https://www.nuget.org/packages/MQTTnet/

Examples

Please find examples and the documentation at the Wiki of this repository (https://github.com/chkr1011/MQTTnet/wiki).

Contributions

If you want to contribute to this project just create a pull request. But only pull requests which are matching the code style of this library will be accepted. Before creating a pull request please have a look at the library to get an overview of the required style.

References

This library is used in the following projects:

MQTT Client Rx (Wrapper for Reactive Extensions, https://github.com/1iveowl/MQTTClient.rx)
Wirehome (Open Source Home Automation system for .NET, https://github.com/chkr1011/Wirehome)

If you use this library and want to see your project here please let me know.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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