Chapter 6 TCP/IP
In this chapter, we will introduce how ESP32-S3 implements network communications based on TCP/IP
protocol. There are two roles in TCP/IP communication, namely Server and Client, which will be implemented
respectively with two projects in this chapter.
Project 6.1 As Client
In this section, ESP32-S3 is used as Client to connect Server on the same LAN and communicate with it.
Component List
Component knowledge
TCP connection
Before transmitting data, TCP needs to establish a logical connection between the sending end and the
receiving end. It provides reliable and error-free data transmission between the two computers. In the TCP
connection, the client and the server must be clarified. The client sends a connection request to the server,
and each time such a request is proposed, a "three-times handshake" is required.
Three-times handshake: In the TCP protocol, during the preparation phase of sending data, the client and the
server interact three times to ensure the reliability of the connection, which is called "three-times handshake".
The first handshake, the client sends a connection request to the server and waits for the server to confirm.
The second handshake, the server sends a response back to the client informing that it has received the
connection request.
The third handshake, the client sends a confirmation message to the server again to confirm the connection.
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