Programming language: Go
License: MIT License
Tags: Networking    
Latest version: v0.9.1

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Project state

This project is less maintained due to personal reasons. Here are some information for people who want to use this project.

Gmqtt was used in production and worked well. The production environment was serving hundreds of clients(or maybe thousands or 10 thousands now), and each client published QoS 1 message to report their state every 15 seconds. The subscribers on the cloud would store those state into persist backend. All clients were non-persistent session and using v3.1.1 protocol.

It is suggested to evaluate and test carefully before running in your production environment.


  • Provide hook method to customized the broker behaviours(Authentication, ACL, etc..). See server/hooks.go for details
  • Support tls/ssl and websocket
  • Provide flexible plugable mechanism. See server/plugin.go and /plugin for details.
  • Provide Go interface for extensions to interact with the server. For examples, the extensions or plugins can publish message or add/remove subscription through function call. See Server interface in server/server.go and admin for details.
  • Provide metrics (by using Prometheus). (plugin: prometheus)
  • Provide GRPC and REST APIs to interact with server. (plugin:admin)
  • Provide session persistence which means the broker can retrieve the session data after restart. Currently, only redis backend is supported.
  • Provide clustering, see [federation plugin](./plugin/federation/README.md) for examples and details. (WARNING: This is an experimental feature, and has never been used in production environment.)

Get Started

To get started with gmqtt, we need to compile it from the source code. Please ensure that you have a working Go environment.

The following command will start gmqtt broker with default configuration. The broker listens on 1883 for tcp server and 8883 for websocket server with admin and prometheus plugin loaded.

$ git clone https://github.com/DrmagicE/gmqtt
$ cd gmqtt/cmd/gmqttd
$ go run . start -c default_config.yml


Gmqtt use -c flag to define configuration path. If not set, gmqtt reads $HOME/gmqtt.yml as default. Here is a sample configuration.

session persistence

Gmqtt uses memory to store session data by default and it is the recommended way because of the good performance. But the session data will be lose after the broker restart. You can use redis as backend storage to prevent data loss from restart:

  type: redis  
    # redis server address
    addr: ""
    # the maximum number of idle connections in the redis connection pool
    max_idle: 1000
    # the maximum number of connections allocated by the redis connection pool at a given time.
    # If zero, there is no limit on the number of connections in the pool.
    max_active: 0
    # the connection idle timeout, connection will be closed after remaining idle for this duration. If the value is zero, then idle connections are not closed
    idle_timeout: 240s
    password: ""
    # the number of the redis database
    database: 0


Gmqtt provides a simple username/password authentication mechanism. (Provided by auth plugin). It is not enabled in default configuration, you can change the configuration to enable it:

# plugin loading orders
  - auth
  - prometheus
  - admin

When auth plugin enabled, every clients need an account to get connected.You can add accounts through the HTTP API:

# Create: username = user1, password = user1pass
$ curl -X POST -d '{"password":"user1pass"}'
# Query
$ curl

API Doc swagger


$ docker build -t gmqtt .
$ docker run -p 1883:1883 -p 8883:8883 -p 8082:8082 -p 8083:8083  -p 8084:8084  gmqtt




Gmqtt implements the following hooks:

Name hooking point possible usages
OnAccept When accepts a TCP connection.(Not supported in websocket) Connection rate limit, IP allow/block list.
OnStop When gmqtt stop
OnSubscribe When received a subscribe packet Subscribe access control, modifies subscriptions.
OnSubscribed When subscribe succeed
OnUnsubscribe When received a unsubscribe packet Unsubscribe access controls, modifies the topics that is going to unsubscribe.
OnUnsubscribed When unsubscribe succeed
OnMsgArrived When received a publish packet Publish access control, modifies message before delivery.
OnBasicAuth When received a connect packet without AuthMethod property Authentication
OnEnhancedAuth When received a connect packet with AuthMethod property (Only for v5 clients) Authentication
OnReAuth When received a auth packet (Only for v5 clients) Authentication
OnConnected When the client connected succeed
OnSessionCreated When creates a new session
OnSessionResumed When resumes from old session
OnSessionTerminated When session terminated
OnDelivered When a message is delivered to the client
OnClosed When the client is closed
OnMsgDropped When a message is dropped for some reasons
OnWillPublish When the client is going to deliver a will message Modify or drop the will message
OnWillPublished When a will message has been delivered

How to write plugins

How to write plugins


Contributions are always welcome, see Contribution Guide for a complete contributing guide.


Unit Test

$ go test -race ./...

Integration Test