MQTT is a publish-subscribe-based messaging protocol used in the internet of Things. A lightweight messaging protocol for small sensors and mobile devices, optimized for high-latency or unreliable networks, enabling a Connected World and the. MQTT in the IoT architecture is a lightweight messaging protocol for sending high volumes of sensor messages to analytics platforms and cloud solutions. MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol that was developed by IBM and first released in 1999. MQTT is an open OASIS and ISO standard (ISO/IEC 20922) lightweight, publish- subscribe network protocol that transports messages between devices. Message Queuing Telemetry Transport (MQTT) is a lightweight application-layer messaging protocol based on the publish/subscribe (pub/sub).