View source for Architecture:Protocols:MQTT

= MQTT =

* Part of [[Architecture:Protocols:Main_Page]]

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== MQTT (Message Queuing Telemetry Transport) ==

'''MQTT''' stands for ''Message Queuing Telemetry Transport''. It is a lightweight messaging protocol designed for low-bandwidth, high-latency, or unreliable networks, and is often used in [[Internet of Things]] (IoT) applications. It allows devices to communicate efficiently.

== How MQTT Works ==
MQTT uses a '''publish/subscribe model''', unlike traditional request/response networking. There is a central '''broker''' (server) that routes messages between devices:

* '''Publishers''': devices that send messages on a topic.
* '''Subscribers''': devices that receive messages from topics they are interested in.
* '''Broker''': manages message delivery, ensuring subscribers get messages they have subscribed to.

== Key Features ==
* '''Lightweight''': Minimal overhead, ideal for small sensors and embedded devices.
* '''Efficient''': Designed for low network bandwidth.
* '''Reliable''': Supports different levels of message delivery:
** QoS 0: At most once (fire-and-forget)
** QoS 1: At least once (may duplicate)
** QoS 2: Exactly once (guaranteed delivery)

== Typical Use Cases ==
* Smart home devices (lights, thermostats)
* Industrial sensors and machinery
* Vehicle telemetry
* Remote monitoring systems

== Ports and Transport ==
* MQTT usually runs over TCP, default port 1883.
* MQTT over TLS/SSL uses port 8883 for secure communication.

== Summary ==
In simple terms, MQTT is like a tiny, super-efficient postal service for devices, letting them send and receive messages without overwhelming the network.