code: def start(self, any_zone):
          
  
          # Find our local network IP address which is accessible to the
          # Sonos net, see http://stackoverflow.com/q/166506
          with self._start_lock:
              if not self.is_running:
                  # Use configured IP address if there is one, else detect
                  # automatically.
                  if config.EVENT_LISTENER_IP:
                      ip_address = config.EVENT_LISTENER_IP
                  else:
                      temp_sock = socket.socket(socket.AF_INET,
                                                socket.SOCK_DGRAM)
                      temp_sock.connect((any_zone.ip_address,
                                         config.EVENT_LISTENER_PORT))
                      ip_address = temp_sock.getsockname()[0]
                      temp_sock.close()
  
                  # Start the event listener server in a separate thread.
                  self.address = (ip_address, config.EVENT_LISTENER_PORT)
                  self._listener_thread = EventServerThread(self.address)
                  self._listener_thread.daemon = True
                  self._listener_thread.start()
                  self.is_running = True
                  log.info("Event listener started")
docs: Start the event listener listening on the local machine at port 1400
          (default)
  
          Make sure that your firewall allows connections to this port
  
          Args:
              any_zone (SoCo): Any Sonos device on the network. It does not
                  matter which device. It is used only to find a local IP address
                  reachable by the Sonos net.
  
          Note:
              The port on which the event listener listens is configurable.
              See `config.EVENT_LISTENER_PORT`