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MQTT Broker

Eclipse Mosquitto is an open-source broker for the MQTT (Message Queuing Telemetry Transport) messaging protocol.

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Eclipse Mosquitto is an open-source broker for the MQTT (Message Queuing Telemetry Transport) messaging protocol. It lets IoT devices and applications exchange data via lightweight publish/subscribe messaging and ships with client libraries and command-line utilities for publishing, subscribing, and administering the broker.

Platform availability

Available on 3 of 9 platforms

  • Unraid
  • TrueNAS
  • Umbrel (not listed)
  • ZimaOS (not listed)
  • Proxmox
  • Helm (not listed)
  • Mac (not listed)
  • Windows (not listed)
  • Linux (not listed)

Health score?A 0-100 score computed nightly from four factors: maintained (40%: recent commits and steady activity), popular (25%: GitHub stars, log scale), easy to install (20%: platforms, install notes, setup guides, Docker image) and light to run (15%: minimum RAM, ARM support). When the source code has been checked, a fifth factor, security check (20%: automated scan for committed secrets, unsafe desktop-app settings, known-vulnerable dependencies and project hygiene; any serious finding caps it at 20), is added. Factors without data are left out and the rest are rescaled.

83/100 Excellent

Maintained
97last commit 49 days ago
Popular
8111,235 GitHub stars
Easy to install
351 install platform, install notes, Docker image
Light to run
100256 MB minimum RAM, runs on ARM
Security check
95no serious findings, CI, tests

Availability: platform listings confirmed today

GitHub stars
11,235
Open issues
890
Last commit
2026-09-03
Activity
unknown

Checked 23 days ago - source: GitHub (eclipse-mosquitto/mosquitto)

Resources & Compatibility

Minimum requirements: 256 MB RAM, 1 CPU core(s), 100 MB disk. ARM (e.g. Raspberry Pi) is supported.

Checked 23 days ago - source: Docker Hub image tags and published docs

First-install notes

  • Installing with Docker Deploy as a Docker container and, for production use, enable authentication, TLS encryption, and persistent storage in the broker's configuration file. source

Fetched 11 days ago - each note links to its source

Alternatives (1)

  • RabbitMQ - RabbitMQ is an open source message broker that implements the Advanced Message Queuing Protocol (AMQP), used to route and queue messages be…

Checked 10 days ago - source: AlternativeTo

Common questions

Can I start Mosquitto without a configuration file for a quick test?

Yes. Running just mosquitto starts a local, anonymous broker that is only useful for initial testing. Use a configuration file with a listener and authentication for clients on other computers.

Can Mosquitto be fronted by HAProxy for TLS termination?

Yes. The documentation includes guidance for using Mosquitto with HAProxy, including deployments where HAProxy performs TLS termination.

What should I expect when building Mosquitto from source?

The build requires cJSON. Use CMake on Windows and Mac or make on other platforms, and use make binary when building from git to skip building man pages.

What common MQTT gateway failures should I check when clients cannot connect?

Check TLS certificate issues, topic mismatches, broker connectivity problems, and DNS errors.

Answers sourced from docs.chipkin.com, github.com, mosquitto.org

Community

Collected yesterday - public community threads