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Mosquitto

An open source MQTT broker

Eclipse Foundation

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About this app

Eclipse Mosquitto is an open source (EPL/EDL licensed) message broker that implements the MQTT protocol versions 5.0, 3.1.1 and 3.1. Mosquitto is lightweight and is suitable for use on all devices from low power single board computers to full servers.

The MQTT protocol provides a lightweight method of carrying out messaging using a publish/subscribe model. This makes it suitable for Internet of Things messaging such as with low power sensors or mobile devices such as phones, embedded computers or microcontrollers.

The Mosquitto project also provides a C library for implementing MQTT clients, and the very popular mosquitto_pub and mosquitto_sub command line MQTT clients.

What's new
Version 2.1.2today

This is a major new release with many new features and improvements:

  • Added built-in WebSockets support that no longer requires libwebsockets
  • Added support for PROXY protocol v1 and v2
  • Added broker-created topic aliases for MQTT v5
  • Added new global_plugin, global_max_clients, and global_max_connections options
  • Added accept_protocol_versions option to limit which MQTT versions are allowed per listener
  • Added --test-config option to validate configuration before going live
  • Added support for PUID/PGID environment variables for setting user/group privileges
  • Added bridge_receive_maximum and bridge_session_expiry_interval options for MQTT v5 bridges
  • Improved idle performance by reducing unnecessary process wakeups
  • Added new acl-file, password-file, persist-sqlite, and sparkplug-aware plugins
  • Dynamic security plugin now generates an initial configuration if none is present
  • ⚠️ max_packet_size now defaults to 2,000,000 bytes instead of 256MB - update your config if you use large payloads
  • ⚠️ The acl_file and password_file options are deprecated in favour of the new plugins
  • ⚠️ Support for TLS v1.1 has been removed
  • ⚠️ Support for OpenSSL versions older than 3.0 has been removed
  • Fixed PUID/PGID checking for Docker
  • Fixed persistence plugin conflict when used alongside persistence true
  • Various build fixes including missing libedit in Docker builds

Full release notes can be found at https://mosquitto.org/blog/

Version 2.0.228 months ago

This update includes several bug fixes and improvements:

  • Improved bridge functionality and idle timeout handling
  • Fixed problems with message queuing and client disconnections
  • Resolved compilation and linking issues on various platforms
  • Enhanced websockets support, including secure websockets
  • Improved memory management and error handling

Full release notes can be found at https://mosquitto.org/blog/

Version 2.0.2111 months ago

⚠️ Important security update that fixes vulnerabilities

This update includes several bug fixes and improvements:

  • Fixed memory leak on malicious SUBSCRIBE and patched a CVE
  • Improved handling of invalid or reserved packets
  • Fixed issues with IPv6 interface binding and anonymous access settings
  • Added option to expire unused retained messages from memory
  • Improved error handling for SSL config file combinations
  • Fixed client deadlock when using certain flags
  • Enabled client ID setting in mosquitto_ctrl dynsec
  • Added timezone data to Docker images
  • Fixed SSL-related test failures under load

Full release notes can be found at https://mosquitto.org/blog/

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