import binascii
import socket
import struct
import sys
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_address = ('10.10.10.10', 2001)
sock.bind(server_address)
sock.listen(1)
unpacker = struct.Struct('>b b b b b b 6s 4s 4s h h h h h h h')
packer = struct.Struct('>b b b b b b 6s 4s 4s h h h h h h h')
while True:
    print >>sys.stderr, '\nwaiting for a connection'
    connection, client_address = sock.accept()
    try:
        data = connection.recv(unpacker.size)
        unpacked_data = unpacker.unpack(data)
        conf_arr = list(unpacked_data)
        conf_arr[3] = 1 # тут должно быть что-то более осмысленное
        packed_data = packer.pack(*conf_arr)
        connection.sendall(packed_data)
        
    finally:
        connection.close()