MQTT and MQTT-SN are lightweight publish/subscribe messaging transports for TCP/IP and connectionless protocols (such as UDP) respectively. The Eclipse Paho project provides open source, mainly client side, implementations of MQTT and MQTT-SN in a variety of programming languages.
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For Constrained Networks
IoT systems need to deal with frequent network disruption and intermittent, slow, or poor quality networks. Minimal data costs are crucial on networks with millions and billons of connected devices.
Devices and Embedded Platforms
Devices and edge-of-network servers often have very limited processing resources available. Paho understands small footprint clients and corresponding server support.
Paho focuses on reliable implementations that will integrate with a wide range of middleware, programming and messaging models.
“How would you connect the information from a temperature sensor on a BeagleBone Black to an LED display on a Raspberry Pi and would your solution scale up to many sensors and displays? In this article we’ll show how MQTT and the Eclipse Paho project can let you answer that challenge.”
Talking Small: Using Eclipse Paho's MQTT on BeagleBone Black and Raspberry Pi »
MQTT is a light weight publish/subscribe messaging protocol, originally created by IBM and Arcom (later to become part of Eurotech) around 1998. MQTT is an OASIS standard. The latest version is 5.0 and is available in a variety of formats.
MQTT 3.1.1 is also an ISO standard (ISO/IEC 20922).
More information about the protocols can be found on MQTT.org.
There is an Eclipse IoT sandbox MQTT server available at mqtt.eclipseprojects.io.