What is MQTT? MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol that is commonly used in IoT (Internet of Things) applications to exchange messages between devices. It was designed to be efficient and easy to implement, making it well-suited for use in resource-constrained devices and networks.

MQTT follows a publish/subscribe model, where devices publish messages to topics, and other devices can subscribe to those topics to receive the messages. The protocol supports three quality of service (QoS) levels to ensure reliable message delivery based on the requirements of the application.

MQTT can be used with a variety of network protocols, including TCP/IP, Wi-Fi, and Bluetooth, and is supported by many IoT platforms and cloud services. Its simplicity and efficiency make it a popular choice for IoT applications, such as home automation, industrial monitoring, and smart cities.

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