Release Date: 2016-08-30

EMQ - Shortened Project Name

Adopt a shortened project name: EMQ(Erlang/Enterprise/Elastic MQTT Broker),E means Erlang/OTP, Enterprise and Elastic.

Improve the Release Management

In order to iterate the project fast, we will adopt a new release management strategy since 2.0. There will be two or three 'Preview Release' named beta1, beta2 or beta3, and then one or two 'Release Candidate' named rc1, rc2 before a Major version is production ready.

Seperate Rel from Application

We split the emqttd 1.x project into two projects since 2.0-beta1 release to resolve the plugins' dependency issue.

A new project named emqttd-relx_ is created and responsible for buiding the emqttd application and the plugins::

git clone

cd emqttd-relx && make

cd _rel/emqttd && ./bin/emqttd console and relx

The rebar which is used in 1.x release is replaced by and relx tools since 2.0-beta1 release.

You can check the 'Makefile' and 'relx.config' in the release project of the borker: emqttd-relx_ .

Improve Git Branch Management

stable 1.x Stable Branch
master 2.x Master Branch
emq10 1.x Developement Branch
emq20 2.x Development Branch
emq30 3.x Development Branch
issue#{id} BugFix Branch

New Config Syntax

Since 2.0-beta1 release the configuration file of the broker and plugins adopt a new syntax like rebar.config and relx.config:

etc/emqttd.conf for example::

%% Max ClientId Length Allowed.
{mqtt_max_clientid_len, 512}.

%% Max Packet Size Allowed, 64K by default.
{mqtt_max_packet_size, 65536}.

%% Client Idle Timeout.
{mqtt_client_idle_timeout, 30}. % Second

MQTT-SN Protocol Plugin

The MQTT-SN Protocol Plugin emqttd_sn_ has been ready in 2.0-beta1 release. The default UDP port of MQTT-SN is 1884.

Load the plugin::

./bin/emqttd_ctl plugins load emqttd_sn

Improve the PubSub Design

.. image:: _static/images/publish.png

Improve the Plugin Management

The plugin of EMQ 2.0 broker is a normal erlang application which depends on and extends 'emqttd'. You can create a standalone plugin application project, and add it to emqttd-relx_ Makefile as a DEP.

All the plugins' config files will be copied to emqttd/etc/plugins/ folder when making emqttd brinary packages in emqttd-relx_ project::

▾ emqttd/
  ▾ etc/
    ▸ modules/
    ▾ plugins/

EMQ 2.0 Documentation