Jmqtt review
A focused open-source broker for teams that want self-hosted MQTT 3.1.1 with MySQL clustering.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Jmqtt is an open-source MQTT broker implemented in Java and Netty, aimed at teams that want to run an MQTT 3.1.1 service on their own infrastructure. The project documents TCP and WebSocket connectivity, plus SSL and WSS, and supports MySQL-based data persistence and clustering. Its plugin and secondary-development support also makes it relevant to developers who want to extend broker behavior rather than adopt a hosted service. The published project is distributed under the Apache-2.0 license.
The clearest fit is a self-hosted deployment where MySQL is an acceptable foundation for both persistence and clustering. Jmqtt’s connection options cover TCP and browser-friendly WebSocket paths, with SSL and WSS also listed. The project describes plugin development for clustering, storage, device connections, and publish-subscribe authentication, so teams can work on those areas through extensions. Repository instructions cover building and running the broker, making this a developer-oriented choice rather than a managed service with a turnkey operating model.
The trade-off is a focused protocol scope: MQTT 3.1.1 is the documented version, and the listed capabilities center on connectivity, MySQL-backed storage and clustering, and plugins. Teams looking for a self-hosted broker with those characteristics may find the scope a match. Those needing a broader documented MQTT feature set or a different persistence and clustering foundation should compare alternatives before choosing Jmqtt. The project lists an online trial endpoint, but its core deployment model is self-hosted.
Jmqtt pros and cons
- Where it wins
- Supports TCP, WebSocket, SSL, and WSS connectivity
- Uses MySQL for data persistence and clustering
- Allows plugins and secondary development, including authentication extensions
- Where it doesn't
- Protocol support is specified for MQTT 3.1.1
- MySQL underpins both persistence and clustering
- Its documented feature set is focused on broker connectivity and extension
Jmqtt fact sheet, pricing and score →
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