mosquitto

USE flags

• bridge - Enable bridge support in the MQTT broker.
• examples - Install examples, usually source code
• persistence - Store messages and subscriptions to a file.
• srv - Include SRV lookup support.
• ssl - Add support for SSL/TLS connections (Secure Socket Layer / Transport Layer Security)
• systemd - Enable use of systemd-specific libraries and features like socket activation or session tracking
• tcpd - Add support for TCP wrappers
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
• websockets - Support the WebSocket protocol.