MQTT is a lightweight publish/subscribe messaging protocol designed for M2M (machine to machine) telemetry in low bandwidth environments although it is fast becoming the protocol of choice for the (IIOT) Industrial Internet of Things applications.
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It was designed by Andy Stanford-Clark (IBM) and Arlen Nipper in 1999 for connecting Oil Pipeline telemetry systems over satellite.
Although it started as a proprietary protocol it was released Royalty free in 2010 and became an OASIS standard in 2014.
The first concept is the publish-and-subscribe mechanic. In a publish-and-subscribe system, a device can publish a message on a topic, or it can be subscribed to a particular topic to receive messages. Messages are automatically pushed to subscribers to the corresponding topic when there is an update.
Due to it being a lightweight protocol. It is ultimately efficient at fast-data transmission providing real-time interation accross the internet. Furthermore, using MQTT puts less computational burden or your system as you only need to send the data you need in small size data packets which minimises overheads and traffic across a network.
System Devices UK Ltd can help you to get your IIoT projects moving, from HMI's with MQTT capabilities to full Automation Controllers for Industry 4.0
Watch the video below for an Introduction to MQTT