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eMQTT Get Started

Overview

eMQTT is a clusterable, massively scalable, fault-tolerant and extensible MQTT V3.1/V3.1.1 broker written in Erlang/OTP.

eMQTT is aimed to provide a solid-stable broker that could be clusterd to support millions of connections and clients.

Requires

eMQTT is cross-platform, could run on windows, linux, freebsd and mac os x.

eMQTT requires Erlang R17+ to build from source.

Featues

Full MQTT V3.1.1 Support

MQTT V3.1.1 and V3.1 protocol support

QoS0, QoS1, QoS2 Publish and Subscribe

Session Management and Offline Messages

Retained Messages

Passed eclipse paho interoperability tests

Clusterable, Massively Scalable

Massive Connections Clients Support

Cluster brokers on servers or cloud hosts

Bridge brokers locally or remotelly

Download, Install

Download

Dowload binary packages from [http://emqtt.io/downloads](http://emqtt.io/downloads].

Please build from source if no packages for your platform, or contact us.

Install

Extract tgz package to your installed directory. for example:

tar xvf emqtt-ubuntu64-0.3.0-beta.tgz && cd emqtt

Startup

Startup console for debug:

cd emqtt && ./bin/emqtt console

You could see all RECV/SENT MQTT Packages on console.

Start as daemon:

cd emqtt && ./bin/emqtt start

eMQTT occupies 1883 port for MQTT, 8083 for HTTP API.

Status

cd emqtt && ./bin/emqtt_ctl status

Stop

cd emqtt && ./bin/emqtt stop

Configuration

etc/app.config

{emqtt, [
    %Authetication. Internal, Anonymous Default.
    {auth, {anonymous, []}},
    {access, []},
    {session, [
        {expires, 1}, %hours
        {max_queue, 1000},
        {store_qos0, false}
    ]},
    {retain, [
        {store_limit, 100000}
    ]},
    {listen, [
        {mqtt, 1883, [
            {max_conns, 1024},
            {acceptor_pool, 4}
        ]},
        {http, 8083, [
            {max_conns, 512},
            {acceptor_pool, 1}
        ]}
    ]}
]}

etc/vm.args

-name emqtt@127.0.0.1

-setcookie emqtt

Cluster

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

configure and start node on host1

configure 'etc/vm.args':

-name emqtt@host1

then start:

./bin/emqtt start

configure and start node on host2

configure 'etc/vm.args':

-name emqtt@host2

./bin/emqtt start

cluster two nodes

Cluster from 'host2':

./bin/emqtt_ctl cluster emqtt@host1

or cluster from 'host1':

./bin/emqtt_ctl cluster emqtt@host2

then check clustered nodes on any host:

./bin/emqtt_ctl cluster

HTTP API

eMQTT support HTTP API to publish message from your APP to MQTT client.

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

Contact

feng@emqtt.io

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