Introduction

EMQX (Erlang/Enterprise/Elastic MQTT Broker) is an open source IoT MQTT message broker based on the Erlang/OTP platform.

Erlang/OTP is an excellent Soft-Realtime, Low-Latency and Distributed development platform.

MQTT is a lightweight message exchange protocol using publish-subscribe pattern.

EMQX is designed for massive clients access and realizes fast and low-latency message routing between massive physical network devices:

1. Stable to host large-scale MQTT client connections, and a single server node supports 2 million connections.
2. Distributed cluster, fast and low-latency message routing, and single-cluster supports tens of thousands of routes.
3. Extensible, support customized plugins, such as authentication and other functions.
4. Comprehensive IoT protocol support, including MQTT, MQTT-SN, CoAP, LwM2M, and other TCP/UDP based proprietary protocol.

Features List

• Full MQTT V3.1/V3.1.1 and V5.0 protocol specification support
  • QoS0, QoS1, QoS2 message support
  • Persistent conversation and offline message support
  • Retained message support
  • Last Will message support
• TCP/SSL connection support
• MQTT/WebSocket/SSL support
• HTTP message publishing interface support
• $SYS/# system theme support
• Client online status query and subscription support
• Client ID or IP address authentication support
• User name and password authentication support
• LDAP authentication
• Redis, MySQL, PostgreSQL, MongoDB, HTTP authentication integration
• Browser cookie authentication
• Access control (ACL) based on client ID, IP address, user name
• Multi-server node cluster (Cluster)
• Support manual, mcast, dns, etcd, k8s and other cluster discovery methods
• Automatic network partition healing
• Message rate limit
• Connection rate limit
• Configure nodes by partition
• Multi-server node bridge (Bridge)
• MQTT Broker bridge support
• Stomp protocol support
• MQTT-SN protocol support
• CoAP protocol support
• Stomp/SockJS support
• Delay Publish ($delay/topic)
• Flapping detection
• Blacklist support
• Shared subscription($share/<group>/topic)
• TLS/PSK support
• Rule engine
  • No action (debug)
  • Message republish
  • Bridge data to MQTT Broker
  • Check (debug)
  • Send data to web service