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EMQX is an open-source, highly scalable, and feature-rich MQTT broker designed for IoT and real-time messaging applications. It supports various protocols, including MQTT (3.1, 3.1.1, and 5.0), HTTP, QUIC, and WebSocket.

GreptimeDB can be used as a data system for EMQX. To learn how to integrate GreptimeDB with EMQX, please refer to Ingest MQTT Data into GreptimeDB.