Eclipse Mosquitto

Eclipse Mosquitto is a lightweight MQTT broker implementing protocol versions 5.0, 3.1.1, and 3.1. It moves messages between clients with a publish/subscribe model, and ships command-line utilities for testing and administration. Its small footprint suits everything from full servers down to low-power and embedded devices.

It also provides a C and C++ client library plus the mosquitto_pub, mosquitto_rr, and mosquitto_sub messaging tools and the mosquitto_ctrl, mosquitto_signal, and mosquitto_passwd admin tools. The broker runs from a basic local setup or a fuller config file for remote clients, with support for several authentication methods and a dynamic security plugin.

Eclipse Mosquitto is part of the Eclipse Foundation and is dual-licensed under the EPL and EDL. Binary packages are available across platforms, and a mosquitto port is included in vcpkg.