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EMQ X Broker - Scalable Distributed MQTT Messaging Broker
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EMQ X Broker

EMQ X broker is a fully open source, highly scalable, highly available distributed MQTT messaging broker for IoT, M2M and Mobile applications that can handle tens of millions of concurrent clients.

Starting from 3.0 release, EMQ X broker fully supports MQTT V5.0 protocol specifications and backward compatible with MQTT V3.1 and V3.1.1, as well as other communication protocols such as MQTT-SN, CoAP, LwM2M, WebSocket and STOMP. The 3.0 release of the EMQ X broker can scaled to 10+ million concurrent MQTT connections on one cluster.


The EMQ X broker is cross-platform, which can be deployed on Linux, Unix, Mac, Windows and even Raspberry Pi.

Download the binary package for your platform from here.

Build From Source

The EMQ X broker requires Erlang/OTP R21+ to build since 3.0 release.

git clone

cd emqx-rel && make

cd _rel/emqx && ./bin/emqx console

Quick Start

# Start emqx
./bin/emqx start

# Check Status
./bin/emqx_ctl status

# Stop emqx
./bin/emqx stop

To view the dashboard after running, use your browser to open: http://localhost:18083


The EMQ X Roadmap uses Github milestones to track the progress of the project.

Community, discussion, contribution, and support

You can reach the EMQ community and developers via the following channels:

Please submit any bugs, issues, and feature requests to emqx/emqx.

MQTT Specifications

You can read the mqtt protocol via the following links:

MQTT Version 3.1.1

MQTT Version 5.0



Copyright (c) 2018 EMQ Technologies Co., Ltd. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");you may not use this file except in compliance with the License.You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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