server.py

import socket

server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_socket.bind(('', 12000))

conn_dict = {}

while True:
    try: 
        message, address = server_socket.recvfrom(1024)
        message = message.decode("utf-8") 
        conn_dict[address[0]] = address[1]   
        
        if message == "pulse\0":
            print("Heartbeat from: {}".format(address))

        else:

            print("{}:{} is requesting a connection to {}".format(address[0], address[1], message))
 
            ipLookUp = message;
         

            if ipLookUp in conn_dict.keys():
                               
               # server_socket.sendto(bytearray(str(7777), "utf-8"), address)
                
                puncherAddress = list(address)
                puncherAddress[1] = str(puncherAddress[1])
                puncherAddress = ":".join(puncherAddress)
                puncherAddress += '\0'




                puncheAddress = (ipLookUp, int(conn_dict[ipLookUp]))

                print("Telling {} that {} wants to punch them.".format(puncheAddress, puncherAddress))
                server_socket.sendto(bytearray(puncherAddress, "utf-8"), puncheAddress)



                print("resolved it")
            else:

                server_socket.sendto(b'404', address)
                print("I could not resolve this")
    except socket.timeout:
        print("Waiting for connection")