It’s one of the Free and open-source brokers of MQTT written in Erlang/OTP.Current stable version 2.8.3 from 12 July 2018.Available for all platforms on which you can run Node.js: MS Windows, Mac OS, and also GNU/Linux distributions.Supports MQTT protocol version 3.1 and 3.1.1.Can be used standalone or embedded in another Node.js application.It’s one of the Free and open-source brokers of MQTT certainly, written in JavaScript.An MQTT client is any device (from a microcontroller up to a full-fledged server) that runs an MQTT library and connects to an MQTT broker over a network.An MQTT broker is a server that receives all messages from the clients and then routes the messages to the appropriate destination clients.When another client publishes a message on a subscribed topic, the broker forwards the message to any client that has subscribed. In short, Each device can subscribe, or register, to particular topics. Clients connect to this broker, which then mediates communication between the two devices. In other words, MQTT is a publish/subscribe protocol that allows edge-of-network devices to publish to a broker.
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It was available under a royalty-free license as protocol version 3.1 since 2010. Its created by Dr Andy Stanford-Clark of IBM and Arlen Nipper of Arcom in 1999. To know about 15 open-source (Public free) brokers of MQTT let’s first understand what MQTT is? MQTT ( Message Queuing Telemetry Transport ) is a machine-to-machine protocol designed to facilitate lightweight publish/subscribe message transportation.