# Echo server program
# Server listening on PORT waiting to recieve a connection
# when a user connects it waits for a message and then replies 
# to the sender with the same message, then quits

import socket 

HOST = ''                 # Symbolic name meaning the localhost (localhost = our own machine)
PORT = 50007              # Arbitrary non-privileged port
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # creating a new socket
s.bind((HOST, PORT)) 	# bind the socket to the host and port we want to listen on 
s.listen(1)             # 1 = number of queued connections
conn, addr = s.accept() # conn is the new socket object, s the addr connecting on the other end
print 'Connected by', addr	# print the address of the client that has just connected
while 1:				# wait for message
    data = conn.recv(1024)	# 1024 = buffer size = how much data can be recieved
    if not data: break
    conn.send(data)		# send response
conn.close()