VolantMQ is a high performance MQTT broker that aims to be fully compliant with MQTT specs

Features

• MQTT v3.1 - V3.1.1
• MQTT V5.0
• WebSockets transport
• SSL for both plain tcp and WebSockets transports
• Independent auth providers for each transport
• Persistence providers

Persistence providers

• BBolt
• In memory

Project has been tested with the following client libraries

• Paho MQTT Conformance/Interoperability Testing Suite (in Python)
  • Pass with all of the test cases
• Paho C Client library (in C)
  • Pass with all of the test cases

Best option is to run prebuilt docker image

docker run --rm -p 1883:1883 -p 8080:8080 -v $(pwd)/examples/config.yaml:/etc/volantmq/config.yaml --env VOLANTMQ_CONFIG=/etc/volantmq/config.yaml volantmq/volantmq

• In example above port 1883 is mqtt listener with default user/password testuser/testpassword
• Port 8080 exposes healthcheck endpoints as well as pprof at http:https://localhost:8080/debug/pprof

Appreciate JetBrains for granted license