import socket
 
server_address=('127.0.0.1',5578)
user_limit=int(8)
 
def main():
    tcp_server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    tcp_server.bind(server_address)
    tcp_server.listen(user_limit)
 
    #Wait until Connection
    client,client_address=tcp_server.accept()
    print('Connection From',client_address)
 
    while True:
        #Wait until Recv One Byte
        recv_type=client.recv(1)
 
        #Connection Closed
        if len(recv_type)==0:
            print('Connection Lost')
            break
 
        recv_type=int.from_bytes(recv_type,byteorder='big',signed=False)
        if recv_type==0:
            print('Client Quit')
            break
 
        elif recv_type==1:
            recv_len=client.recv(1)
            #Should be Same with Client
            recv_len=int.from_bytes(recv_len,byteorder='big',signed=False)
 
            recv_message=client.recv(recv_len)
            recv_message=recv_message.decode('utf-8')
 
            print(recv_message)
 
    client.close()
 
if __name__=='__main__':
    main()

import socket
 
server_address=('127.0.0.1',5578)
 
def main():
    server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
    server.connect(server_address)
    print('Connect Finished')
 
    while True:
        message=input('')
 
        if message=='Q':
            mess_type=int(0)
            mess_type=mess_type.to_bytes(1,byteorder='big',signed=False)
 
            server.sendall(mess_type)
 
            break
 
        else:
            mess_type=int(1)
            mess_type=mess_type.to_bytes(1,byteorder='big',signed=False)
 
            message=message.encode('utf-8')
 
            message_len=len(message)
            message_len=message_len.to_bytes(1,byteorder='big',signed=False)
 
            server.sendall(mess_type+message_len+message)
 
    server.close()
 
if __name__=='__main__':
    main()