serer.py

# -*- coding: utf-8 -*-
# https://www.liaoxuefeng.com/wiki/0014316089557264a6b348958f449949df42a6d3a2e542c000/001432004374523e495f640612f4b08975398796939ec3c000#0

import socket, threading, time

#TCP socket based on ipv4
#server
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

#listening on port
s.bind(('0.0.0.0', 9999))
s.listen(5)
print("Waiting for connection...")

def tcplink(sock, addr):
    print('Accept new connection from %s:%s...' % addr)
    sock.send(b'Welcome!')
    while True:
        data = sock.recv(1024)
        time.sleep(1)
        if not data or data.decode('utf-8') == 'exit':
            break
        sock.send(('Hello, %s!' %data.decode('utf-8')).encode('utf-8'))
    sock.close()
    print('Connection from %s:%s closed.' % addr)

while True:
    #receive a new connect 
    sock, addr = s.accept()
    #make a new thread dispose TCPlink
    t = threading.Thread(target=tcplink, args=(sock, addr))
    t.start()