Mosquitto is a message broker that implements the MQ Telemetry Transport (MQTT) protocol version 3. MQTT provides a lightweight method of carrying out messaging using a publish/subscribe model.
Probably the most famous example of this is all of the work that Andy Stanford-Clark (one of the originators of MQTT) has done in home monitoring and automation with his twittering house and twittering ferry (but it's not all about twitter!).
What's New in This Release: [ read full changelog ]
· Fix compliance with the MQTT protocol for messages published at QoS 2. This means that messages that time out are dealt with correctly and duplicate messages are also dealt with correctly.