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

MQTT stands for MQ Telemetry Transport. 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 and 3.1.1 specifications, integration of MQTT-SN is planned. Currently the following features are implemented:

• QoS 0, QoS 1, QoS 2
• Basic Authentication and Authorization
• Bridge Support
• $SYS Tree for monitoring and reporting
• SSL Encryption
• Dynamic Topics
• Websockets Support
• Cluster Support
• SNMP Monitoring
• Logging (Console, Files, Syslog)
• Reporting to Graphite
• Extensible Plugin architecture
• Multiple Sessions per ClientId
• Session Balancing

For more information head over to the VerneMQ Documentation or to the product page VerneMQ.