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MOSQUITTO(7) Conventions and miscellaneous MOSQUITTO(7) NAME mosquitto - Project overview DESCRIPTION The mosquitto project contains MQTT related programs, and comprises the mosquitto broker and applications, command line clients, and a client li- brary for implementing custom MQTT clients. A brief description of some MQTT features is available at mqtt(7). Mosquitto is an Eclipse Foundation project, part of the IoT top level project. The project home page is at mosquitto.org, the github project is at github.com/eclipse-mosquitto/mosquitto, and the project provides a public MQTT test broker available at test.mosquitto.org. Development is driven by Cedalo, who also provide professional support and enterprise features for mosquitto. MOSQUITTO BROKER The mosquitto broker is the core of the project. Details on starting the broker, MQTT support, and feature descriptions can be found in mosquitto(8). A full description of the configuration file format can be found in mosquitto.conf(5). MOSQUITTO BROKER APPLICATIONS These command line applications directly support the running of the mosquitto broker. mosquitto_ctrl This can be used to interact with the broker MQTT APIs when the broker is running. It can run in batch mode, where all arguments are provided on the command line, or from version 2.1 onwards, in an interactive shell mode. The batch mode is described in mosquitto_ctrl(1), with the Dynamic Security module described in mosquitto_ctrl_dynsec(1). The interactive shell mode is described in mosquitto_ctrl_shell(1). mosquitto_passwd This tool is used to generate and modify password files that can be used with the mosquitto_password_file plugin or password_file configuration op- tion. It is described in mosquitto_passwd(1). mosquitto_signal Available from version 2.1. This tool is used to send signals to the broker. On POSIX systems it per- forms the same task as the kill command, but with named signals. On Windows it is the only method of sending signals to the broker. It is described in mosquitto_signal(1). MOSQUITTO MQTT COMMAND LINE CLIENTS These command line tools act as MQTT clients and can be useful for testing and automation of tasks related to any MQTT broker. mosquitto_pub This client can publish messages to a broker. It supports sending simple messages from the command line, reading from stdin, and sending files. It is described at mosquitto_pub(1). mosquitto_rr This client operates in a request/response style by sending a single mes- sage to a broker and waiting for a response on another topic. Request/re- sponse support is an MQTT v5.0 feature, but it is not required most cases for this client. It is described at mosquitto_rr(1). mosquitto_sub This client subscribes to topics on the broker and prints messages that it receives. It has a wide variety of output options. It is described at mosquitto_sub(1). MOSQUITTO CLIENT LIBRARY The Mosquitto client library is described at libmosquitto(3). AUTHOR Roger Light <roger@atchoo.org> Mosquitto Project 07/30/2026 MOSQUITTO(7)
NAME | DESCRIPTION | MOSQUITTO BROKER | MOSQUITTO BROKER APPLICATIONS | MOSQUITTO MQTT COMMAND LINE CLIENTS | MOSQUITTO CLIENT LIBRARY | AUTHOR
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