dash in domogik

from pydhcplib.dhcp_network import *
from urllib2 import Request, urlopen, URLError, HTTPError #pour pouvoir appeler                                                                                                  une url
import time

def do_something():
    print("button has been pressed")
    urlopen("http://192.168.0.1:40406/rest/cmd/id/291?value=1"                                                                                                 , timeout = 1)
    # Wait for 2 seconds
    time.sleep(2)
    urlopen("http://192.168.0.1:40406/rest/cmd/id/291?value=0"                                                                                                 , timeout = 1)

netopt = {'client_listen_port':"68", 'server_listen_port':"67", 'listen_address'                                                                                                 :"0.0.0.0"}

class Server(DhcpServer):
    def __init__(self, options, dashbuttons):
        DhcpServer.__init__(self, options["listen_address"],
                                options["client_listen_port"],
                                options["server_listen_port"])
        self.dashbuttons = dashbuttons

    def HandleDhcpRequest(self, packet):
        mac = self.hwaddr_to_str(packet.GetHardwareAddress())
        self.dashbuttons.press(mac)


    def hwaddr_to_str(self, hwaddr):
        result = []
        hexsym = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f                                                                                                 ']
        for iterator in range(6) :
            result += [str(hexsym[hwaddr[iterator]/16]+hexsym[hwaddr[iterator]%1                                                                                                 6])]
        return ':'.join(result)

class DashButtons():
    def __init__(self):
        self.buttons = {}

    def register(self, mac, function):
        self.buttons[mac] = function

    def press(self, mac):
        if mac in self.buttons:
            self.buttons[mac]()
            return True
        return False


dashbuttons = DashButtons()
dashbuttons.register("xx:xx:xx:xx:xx:xx", do_something)
server = Server(netopt, dashbuttons)

while True :
    server.GetNextDhcpPacket()

Works only for 1 dash for now
And needed mac in minus at the end of file