Raspberry pie and PC end use python for instant messaging in LAN

The computer and raspberry pie are in the same LAN. First, create the python running environment in the computer and raspberry pie, and then run rpi.py in the raspberry pie with python.Run computer.py on your computer;Enter characters on your computer to display raspberry pie instantly!

rpi.py

#coding:utf-8
#import necessary package
import socket
import time
import sys


HOST_IP = "192.168.31.151" # Raspberry pie IP address 
HOST_PORT = 8888
print("Starting socket: TCP...")
#1.create socket object:socket=socket.socket(family,type)
socket_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
print("TCP server listen @ %s:%d!" %(HOST_IP, HOST_PORT) )
host_addr = (HOST_IP, HOST_PORT)
#2.bind socket to addr:socket.bind(address)
socket_tcp.bind(host_addr)
#3.listen connection request:socket.listen(backlog)
socket_tcp.listen(1)
#4.waite for client:connection,address=socket.accept()
socket_con, (client_ip, client_port) = socket_tcp.accept()
print("Connection accepted from %s." %client_ip)
socket_con.send("Welcome to RPi TCP server!")

print("Receiving package...")

### Main cycle 
while True:
 try:
  data=socket_con.recv(512)
  if len(data)>0:
   print("Received:%s"%data)
   socket_con.send(data)
   time.sleep(1)
   continue
 except Exception:
   socket_tcp.close()
   sys.exit(1)

computer.py

import socket
import time
import sys

SERVER_IP = "192.168.31.151" # Raspberry pie IP address 
SERVER_PORT = 8888

print("Starting socket: TCP...")
server_addr = (SERVER_IP, SERVER_PORT)
socket_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

while True:
 try:
  print("Connecting to server @ %s:%d..." %(SERVER_IP, SERVER_PORT))
  socket_tcp.connect(server_addr)
  break
 except Exception:
  print("Can't connect to server,try it latter!")
  time.sleep(1)
  continue
print("Please input:")
while True:
 try:
  data = socket_tcp.recv(512)
  if len(data)>0:
   print("Received: %s" % data)
   command=raw_input()
   socket_tcp.send(command)
   time.sleep(1)
   continue
 except Exception:
  socket_tcp.close()
  socket_tcp=None
  sys.exit(1)