In embedded systems, network sockets often use the following network communication protocols:
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TCP/IP protocol: TCP/IP (Transmission Control Protocol/Internet Protocol) is the most common and widely used combination of network protocols. It provides reliable, connection-oriented communication and ensures that data is transmitted in the correct order and without loss. The TCP/IP protocol is suitable for scenarios that require the reliability and order of data transmission, such as web browsing and file transmission.
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UDP protocol: UDP (User Datagram Protocol) is a connectionless communication protocol. Unlike the TCP/IP protocol, UDP does not provide reliability and order guarantees, so packet loss or out-of-sequence may occur when transmitting data. UDP is suitable for applications that require high real-time performance, such as audio and video transmission, and scenarios that require high data transmission efficiency.
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HTTP protocol: HTTP (Hypertext Transfer Protocol) is an application layer protocol based on TCP/IP, which is used to transmit hypertext data, that is, web page data. In the embedded system, the data interaction and communication between the device and the server can be realized by using the HTTP protocol. For example, the HTTP protocol can send a request to the server and get a response to realize remote control and data transmission.
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MQTT protocol: MQTT (Message Queuing Telemetry Transport) is a lightweight, IoT-oriented communication protocol. It is suitable for communication between resource-constrained embedded devices and sensors, and features low power consumption and high bandwidth efficiency. The MQTT protocol is often used in the Internet of Things system to implement message delivery and communication in the publish-subscribe mode between devices.
It is necessary to select an appropriate network communication protocol according to different application scenarios. The TCP/IP and UDP protocols are the most common and versatile choices, the HTTP protocol is suitable for Web data interaction, and the MQTT protocol is suitable for the communication needs of the Internet of Things.