Raspberry Pi Dev Log: Host–Pi TCP Chat with Python Sockets

Source: https://blog.csdn.net/2403_87969572/article/details/146921951

Captured at (local ISO): 2026-05-18 05:16:53

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Introduction

IoT projects lean heavily on the Raspberry Pi family for affordable Linux at the edge. Among transport layers, TCP remains the default first hop when you need reliable, ordered byte streams. This article shows how to stitch a minimal Python socket demo so the Pi behaves as the server while your Windows desktop joins as the client.

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I. Preparation

Readers landing here are usually already onboarded to Raspberry Pi basics—so we pivot quickly into TCP—but you still need baseline connectivity.

1. Adding Wi-Fi

Reference walkthrough: nmcli Wi-Fi module on Raspberry Pi

2. Installing Python on Raspberry Pi

Use your distro’s guide, e.g. Python environment on Raspberry Pi

3. Reading PC & Pi IPv4 on the same LAN

Raspberry Pi

hostname -I

Or hover the Wi-Fi tray icon for the assigned address.

Host PC

A. Command Prompt — Win + R → cmd → run ipconfig.

B. Network adapter GUI

1. Win + R → paste ncpa.cpl → Enter
   
2. Double-click Ethernet or Wi-Fi.
3. Open Details / Properties dialogs; copy IPv4 Address.

4. Remote desktop (optional)

If you prefer GUI upkeep: VNC Viewer targeting Raspberry Pi 5 desktops

II. TCP overview

Transmission Control Protocol is connection-oriented and reliable: segments carry sequence numbers, acknowledgements chase loss, reordering heals jitter, clients initiate while servers listen/accept.

This lab pins the Raspberry Pi as server (bind/listen) and Windows as client (connect), mirroring IoT gateways talking back to desktops.

III. Hands-on steps

Swap 172.20.10.6 placeholders for your Pi’s reachable IPv4; keep firewall rules open on port 8989 if relevant.

1. Server side

Create socket endpoint:

import socket
socket_server = socket.socket()

Bind NIC + listening port (must reflect Pi LAN IP):

socket_server.bind(("172.20.10.6", 8989))

Listen backlog:

socket_server.listen(100)

Accept loop scaffolding:

while True：
	client_socket, client_address = socket_server.accept()

Serve / echo loop skeleton:

	while True:
    	data = client_socket.recv(1024).decode("UTF-8")
    	print(f"服务端收到数据 : {data}")
    	client_socket.send(f"服务端收到如下: {data}".encode())
    	print(f"向客户端发送: {data}")
    	if data == '0':
            break

Tear down per session:

	client_socket.close()
	print(f'客户端断开连接 {client_address}')

Full server script

import socket
socket_server = socket.socket()
socket_server.bind(("172.20.10.6", 8989))
socket_server.listen(100)
while True:
    client_socket, client_address = socket_server.accept()
    while True:
        data = client_socket.recv(1024).decode("UTF-8")
    	print(f"服务端收到数据 : {data}")
    	client_socket.send(f"服务端收到如下: {data}".encode())
    	print(f"向客户端发送: {data}")
        if data == '0':
            break
    client_socket.close()
    print(f'客户端断开连接 {client_address}')

2. Client side

Initialize:

import socket
client_socket = socket.socket()

Connect to Pi:

client_socket.connect(("172.20.10.6", 8989))

Interactive REPL:

while True:
    command = input("请输入发送内容: ")
    client_socket.send(command.encode())
    print(f"客户端向服务端发送: {command}")
    if command == '0':
        break
    data = client_socket.recv(1024).decode("UTF-8")
    print(f"服务端: {data}")

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Shutdown

client_socket.close()

Full client script

import socket
client_socket = socket.socket()
client_socket.connect(("172.20.10.6", 8989))
while True:
    command = input("请输入: ")
    client_socket.send(command.encode())
    print(f"客户端发送数据: {command}")
    if command == '0':
        break
    data = client_socket.recv(1024).decode("UTF-8")
    print(f"接受到服务端的数据: {data}")
client_socket.close()
print("客户端关闭")