The Essential Guide to MQTT: All Core Concepts and FAQs Explained

Message Queuing Telemetry Transport (MQTT) is a lightweight, publish–subscribe messaging protocol designed for constrained devices and unreliable networks. Originally developed by IBM in the late 1990s, MQTT has become the backbone of modern IoT systems, connecting sensors, embedded devices, and cloud platforms efficiently.
Its strength lies in simplicity: small packet overhead, efficient bandwidth usage, and a flexible publish–subscribe architecture that decouples data producers from consumers.
This makes MQTT ideal for embedded systems, where resources are limited, but reliable communication is crucial.

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