The Eclipse Paho project provides open-source client implementations of MQTT and MQTT-SN messaging protocols aimed at new, existing, and emerging applications for the Internet of Things (IoT).

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MQTT is a light-weight publish/subscribe messaging protocol, originally created by IBM and Arcom (later to become part of Eurotech) around 1998. The MQTT 3.1.1 specification has now been standardised by the OASIS consortium. The standard is available in a variety of formats.

As of 2016, MQTT is now an ISO standard (ISO/IEC 20922)

More information about the protocol can be found on the MQTT.org community site.

There is a publically accessible sandbox server for the Eclipse IoT projects available at iot.eclipse.org, port 1883.