Mosquitto

Mosquitto is an Open Source MQTT v3.1 message broker written by Roger Light. It aims to provide the same features (and more) as IBM's Really Small Message Broker but as fully Open Source software.

quick link → to a blog post on getting started with Mosquitto on Ubuntu

and another → Getting Started with MQTT

Mosquitto is available at http://mosquitto.org/download and can also be installed on recent versions of Ubuntu from the normal package repository. The latest version is always available from the Mosquitto PPA.

To add the ppa and install Mosquitto on ubuntu 9.10+:

sudo add-apt-repository ppa:mosquitto-dev/mosquitto-ppa && sudo apt-get update && sudo apt-get install mosquitto

If installed from the ppa or Debian package Mosquitto will start automatically

For RPM-based installs see General outline Still needs some work but drop a line on the irc channel #mqtt if something looks incorrect.

Download the latest tar from http://mosquitto.org/download Currently mosquitto-0.15.tar.gz

The following instructions are for the Debian install

$ sudo apt-get install libwrap0-dev
$ tar zxf mosquitto-0.15.tar.gz
$ cd mosquitto-0.15
$ make
$ sudo make install
$ sudo ldconfig

Included with Mosquitto are two basic command line clients: mosquitto_pub and mosquitto_sub. They can be used testing of the broker, and combined with a scripting language to implement many pub/sub functions. Mosquitto can also interface with other MQTT clients.

Full manpage documentation covering configuration and usage is available via the mosquitto website

Currently mosquitto is largely similar in functionality to RSMB, but it does not support the following options (these may be added in future; an up-to-date list is maintained at the end of the shipped mosquitto.conf file):

autosave_on_changes
addresses
notification_topic
round_robin
ffdc_output
max_log_entries
trace_level
trace_output
try_private

The Mosquitto client library also does not support multiple topic Subscribe/Unsubscribe actions within a single message.