GitHub – eclipse-mosquitto/mosquitto: Eclipse Mosquitto

Mosquitto is an open source implementation of a server for version 5.0, 3.1.1,
and 3.1 of the MQTT protocol. It also includes a C and C++ client library,
the mosquitto_pub mosquitto_rr, and mosquitto_sub utilities for
publishing and subscribing, and the mosquitto_ctrl, mosquitto_signal, and
mosquitto_passwd applications for helping administer the broker.

See the following links for more information on MQTT:

Mosquitto project information is available at the following locations:

There is also a public test server available at https://test.mosquitto.org/

See https://mosquitto.org/download/ for details on installing binaries for
various platforms.

If you have installed a binary package the broker should have been started
automatically. If not, it can be started with a very basic configuration:

Then use mosquitto_sub to subscribe to a topic:

mosquitto_sub -t 'test/topic' -v

And to publish a message:

mosquitto_pub -t 'test/topic' -m 'hello world'

Note that starting the broker like this allows anonymous/unauthenticated access
but only from the local computer, so it’s only really useful for initial testing.

If you want to have clients from another computer connect, you will need to
provide a configuration file. If you have installed from a binary package, you
will probably already have a configuration file at somewhere like
/etc/mosquitto/mosquitto.conf. If you’ve compiled from source, you can write
your config file then run as mosquitto -c /path/to/mosquitto.conf.

To start your config file you define a listener and you will need to think
about what authentication you require. It is not advised to run your broker
with anonymous access when it is publicly available.

For details on how to do this, look at the
authentication methods
available and the dynamic security plugin.

Documentation for the broker, clients and client library API can be found in
the man pages, which are available online at https://mosquitto.org/man/. There
are also pages with an introduction to the features of MQTT, the
mosquitto_passwd utility for dealing with username/passwords, and a
description of the configuration file options available for the broker.

Detailed client library API documentation can be found at https://mosquitto.org/api/

To build from source the recommended route for end users is to download the
archive from https://mosquitto.org/download/.

On Windows and Mac, use cmake to build. On other platforms, just run make
to build. For Windows, see also README-windows.md.

If you are building from the git repository then the documentation will not
already be built. Use make binary to skip building the man pages, or install
docbook-xsl on Debian/Ubuntu systems.

• cJSON – required
• c-ares (libc-ares-dev on Debian based systems) – optional, enable with
  WITH_SRV=yes
• libedit – for mosquitto_ctrl interactive shell – optional, disable with
  WITH_EDITLINE=no
• libmicrohttpd – for broker http api support – optional, disable with
  WITH_HTTP_API=no
• openssl (libssl-dev on Debian based systems) – optional, disable with
  WITH_TLS=no
• pthreads – for client library thread support. This is required to support the
  mosquitto_loop_start() and mosquitto_loop_stop() functions. If compiled
  without pthread support, the library isn’t guaranteed to be thread safe.
• sqlite3 – for persistence support in the broker – optional, disable with
  WITH_SQLITE=no
• uthash / utlist – bundled versions of these headers are provided, disable
  their use with WITH_BUNDLED_DEPS=no
• xsltproc (xsltproc and docbook-xsl on Debian based systems) – only needed
  when building from git sources – disable with WITH_DOCS=no

Equivalent options for enabling/disabling features are available when using the
CMake build. It is also possible to enable/disable building of specific plugins
in the CMake build.

You can download and install mosquitto using the vcpkg dependency manager:

git clone https://github.com/Microsoft/vcpkg.git
cd vcpkg
./bootstrap-vcpkg.sh
./vcpkg integrate install
./vcpkg install mosquitto

The mosquitto port in vcpkg is kept up to date by Microsoft team members and
community contributors. If the version is out of date, please create an issue
or pull request on the vcpkg repository.

Mosquitto was written by Roger Light [email protected]. There have been
substantial contributions by other people in the community both in terms of
code and other help.