#!/usr/bin/python3
# -*- coding: utf-8 -*-

import socket

server_port = 12000

# AF_INET specifies IPv4
# SOCK_DRAM specifies UDP
server_socket = socket.socket(family=socket.AF_INET, type=socket.SOCK_DGRAM)

# server does not need its own IP
server_socket.bind(("", server_port))

print("Server says ready to receive")

while True:
    message, client_address = server_socket.recvfrom(2048)
    print(f"\nServer says message received from client was: {message.decode()}")
    if message.decode() == "secret backdoor killswitch":
        break
        # If you were a client, how would you know this branch existed?
    modified_message = message.decode().upper()
    print("Server says message was from address: ", client_address)
    server_socket.sendto(modified_message.encode(), client_address)

server_socket.close()