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This article mainly introduces the example analysis of MQTT, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let the editor take you to understand it.

MQTT (Message Queuing Telemetry Transport, message queuing Telemetry Transport Protocol) is a "lightweight" communication protocol based on publish / subscribe (publish/subscribe) mode, which is based on TCP/IP protocol and was released by IBM in 1999. The biggest advantage of MQTT is that it can provide real-time and reliable message service for connecting remote devices with very little code and limited bandwidth. As an instant messaging protocol with low overhead and low bandwidth consumption, it is widely used in Internet of things, small devices, mobile applications and so on.

The MQTT protocol defines two entity types in the network: a message broker and some clients. An agent is a server that receives all messages from the client and then routes them to the relevant target client. A client is anything that can interact with an agent to send and receive messages. The client can be an on-site IoT sensor or an application that processes IoT data in the data center.

The client connects to the agent. It can subscribe to any message "topic" in the broker. This connection can be a simple TCP/IP connection or an encrypted TLS connection used to send sensitive messages. The client publishes messages within the scope of a topic by sending messages and topics to the agent. The agent then forwards the message to all clients that subscribe to the topic.

Because MQTT messages are organized by topic, application developers have the flexibility to specify that certain clients can only interact with certain messages. For example, the sensor will publish readings within the scope of the "sensor_data" topic and subscribe to the "config_change" topic. Data processing applications that save sensor data to a back-end database subscribe to the "sensor_data" topic. The administrative console application can receive commands from the system administrator to adjust the configuration of the sensor, such as sensitivity and sampling frequency, and publish these changes to the "config_change" topic.

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