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VerneMQ is a high-performance, distributed MQTT broker that connects IoT, M2M, Mobile, and web applications. It scales horizontally and vertically on commodity hardware to support a high number of concurrent publishers and consumers while maintaining low latency and fault tolerance.

VerneMQ is the reliable message hub for your IoT platform or smart products.

VerneMQ is an Apache2 licensed distributed MQTT broker, developed in Erlang.

MQTT used to stand for MQ Telemetry Transport, but it no longer is an acronym. It is an extremely simple and lightweight publish/subscribe messaging protocol, that was invented at IBM and Arcom (now Eurotech) to connect restricted devices in low bandwidth, high-latency or unreliable networks.

VerneMQ implements the MQTT 3.1, 3.1.1 and 5.0 specifications. Currently the following features are implemented and delivered as part of VerneMQ:

  • QoS 0, QoS 1, QoS 2
  • Basic Authentication and Authorization
  • Bridge Support
  • $SYS Tree for monitoring and reporting
  • TLS (SSL) Encryption
  • Websockets Support
  • Cluster Support
  • Logging (Console, Files, Syslog)
  • Reporting to Graphite
  • Extensible Plugin architecture
  • Multiple Sessions per ClientId
  • Session Balancing
  • Shared subscriptions
  • Message load regulation
  • Message load shedding (for system protection)
  • Offline Message Storage (based on LevelDB)
  • Queue can handle messages FIFO or LIFO style.
  • MongoDB auth & integration
  • Redis auth & integration
  • MySQL auth & integration
  • PostgreSQL auth & integration
  • CockroachDB auth & integration
  • Memcached integration
  • HTTP Webhooks
  • PROXY Protocol v2
  • Administration HTTP API
  • Real-time MQTT session tracing
  • Full multitenancy
  • Cluster status web page

The following features are also applies to MQTT 5.0 clients:

  • Enhanced authentication schemes (AUTH)
  • Message expiration
  • Last Will and Testament delay
  • Shared subscriptions
  • Request/response flow
  • Topic aliases
  • Flow control
  • Subscription flags (Retain as Published, No Local, Retain Handling)
  • Subscriber identifiers
  • All property types are supported: user properties, reason strings, content types etc.

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