TCPIP-dat

tools

1. Netcat (nc) == Cross-platform or Windows

• Type: Command-line
• Supports: TCP and UDP
• Platforms: Linux, macOS, Windows (via ncat)

Example (TCP listener):

nc -l -p 5000

Example (send TCP):

echo "Hello" | nc 127.0.0.1 5000

TCP server python script

# tcp_server.py
import socket

HOST = '0.0.0.0'  # Listen on all interfaces
PORT = 5000       # Change as needed

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind((HOST, PORT))
server_socket.listen()

print(f"Listening on {HOST}:{PORT}...")

conn, addr = server_socket.accept()
print(f"Connected by {addr}")

while True:
    data = conn.recv(1024)
    if not data:
        break
    print("Received:", data.decode())
    conn.sendall(b'ACK: ' + data)  # Send back confirmation

conn.close()

1） tcp通讯过程

2） tcp client

http-dat、mqtt-dat 这些协议都是在tcp之上的协议。