Eclipse Mosquitto
The lightweight MQTT broker that connects your devices, from edge to server.
Mosquitto is the Eclipse Foundation's open-source MQTT broker: it routes publish/subscribe messages between sensors, gateways and applications. Written in C, it runs on anything from a microcontroller or Raspberry Pi to a full server, and supports MQTT 3.1, 3.1.1 and 5.0 with TLS. It's the default pick when you want a reliable, minimal broker with no heavy dependencies.
What Eclipse Mosquitto brings to your project.
Typical use cases: Pub/sub backbone for connected-device fleets and IoT telemetry.
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Tiny footprint: runs from the edge (IoT, Raspberry Pi) to servers.
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MQTT 3.1, 3.1.1 and 5.0, plus TLS, WebSockets and authentication.
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Eclipse open source, stable and battle-tested in production for years.
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mosquitto_pub / mosquitto_sub CLI clients to test and script quickly.
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