Simple Multi-Platform IoT Implementation using MQTT

The Organization for the Advancement of Structured information (OASIS) approved Message Queuing Telemetry Transport (MQTT) Version 3.1.1 as an OASIS Standard in 2014, and it has been defined as the reference standard for IoT. MQTT is a published-subscribed message transfer protocol that includes managing communication unit (broker) and clients.

The MQTT broker is a message transfer platform that authorizes the message producer client to publish messages with a message identifier topic. Each client subscribes to one or more topics. A client that sends messages called publisher, and the one that receives messages is called subscriber. Clients must notice hostname/IP and port of the broker in order to publish-subscribe to messages.. Moreover, the message header requires only 2 bytes, which is extremely lightweight published/subscribed messaging protocol for small and

constrained devices. By implementing this protocol in smart homes, all the we can send all the data to cloud easily and monitor different events.