## Overview [![Build Status](https://travis-ci.org/emqtt/emqttd.svg?branch=master)](https://travis-ci.org/emqtt/emqttd)

emqttd is a clusterable, massively scalable MQTT V3.1/V3.1.1 broker written in Erlang/OTP. emqttd support both MQTT V3.1/V3.1.1 Protocol Specification.

emqttd requires Erlang R17+ to build.

## Download

Download binary packeges for linux, mac and freebsd from [http://emqtt.io/downloads](http://emqtt.io/downloads)

## Benchmark

Benchmark 0.6.1-alpha on a ubuntu/14.04 server with 8 cores, 32G memory from QingCloud:

200K+ Connections, 200K+ Topics, 20K+ In/Out Messages/sec, 20Mbps+ In/Out with 8G Memory, 50%CPU/core

## Featues

Full MQTT V3.1.1 Support

Both V3.1.1 and V3.1 protocol support

QoS0, QoS1, QoS2 Publish and Subscribe

Session Management and Offline Messages

Retained Messages

TCP/SSL connection support

[$SYS/borkers/#](https://github.com/emqtt/emqtt/wiki/$SYS-Topics-of-Broker) support

Passed eclipse paho interoperability tests


## Clusterable, Massively Scalable

Massive Connections Clients Support

Cluster brokers on servers or cloud hosts

Bridge brokers locally or remotelly


## Startup in Five Minutes

```
$ git clone git://github.com/emqtt/emqttd.git

$ cd emqttd

$ make && make dist

$ cd rel/emqttd

$ ./bin/emqttd console
```

## Deploy and Start

### start

```
cp -R rel/emqttd $INSTALL_DIR

cd $INSTALL_DIR/emqttd

./bin/emqttd start

```

### stop

```
./bin/emqttd stop

```

## Configuration

### etc/app.config

```
 {emqttd, [
    {auth, {anonymous, []}}, %internal, anonymous
    {listen, [
        {mqtt, 1883, [
            {acceptors, 4},
            {max_clients, 1024}
        ]},
        {mqtts, 8883, [
            {acceptors, 4},
            {max_clients, 1024},
            %{cacertfile, "etc/ssl/cacert.pem"}, 
            {ssl, [{certfile, "etc/ssl.crt"},
                   {keyfile,  "etc/ssl.key"}]}
        ]},
        {http, 8083, [
            {acceptors, 1},
            {max_clients, 512}
        ]}
    ]}
 ]}

```

### etc/vm.args

```

-name emqttd@127.0.0.1

-setcookie emqtt

```

When nodes clustered, vm.args should be configured as below:

```
-name emqttd@host1
```

## Cluster

Suppose we cluster two nodes on 'host1', 'host2', Steps:

on 'host1':

```
./bin/emqttd start
```

on 'host2':

```
./bin/emqttd start

./bin/emqttd_ctl cluster emqttd@host1
```

Run './bin/emqttd_ctl cluster' on 'host1' or 'host2' to check cluster nodes.

## HTTP API

emqttd support http to publish message.

Example:

```
curl -v --basic -u user:passwd -d "qos=1&retain=0&topic=a/b/c&message=hello from http..." -k http://localhost:8083/mqtt/publish
```

### URL

```
HTTP POST http://host:8083/mqtt/publish
```

### Parameters

Name    |  Description
--------|---------------
qos     |  QoS(0, 1, 2)
retain  |  Retain(0, 1)
topic   |  Topic
message |  Message

## Design

[Design Wiki](https://github.com/emqtt/emqttd/wiki)

## License

The MIT License (MIT)

## Author

feng at emqtt.io

## Thanks

@hejin1026 (260495915 at qq.com)

@desoulter (assoulter123 at gmail.com)

@turtleDeng