code: def discover(timeout=5,
               include_invisible=False,
               interface_addr=None,
               all_households=False):
      
  
      found_zones = set()
      first_response = None
  
      def callback(zone):
          nonlocal first_response
  
          if first_response is None:
              first_response = time.monotonic()
  
          if include_invisible:
              found_zones.update(zone.all_zones)
          else:
              found_zones.update(zone.visible_zones)
  
          if not all_households:
              thread.stop()
  
      thread = discover_thread(
          callback, timeout, include_invisible, interface_addr)
      while thread.is_alive() and not thread.stopped():
          if first_response is None:
              thread.join(timeout=1)
          else:
              thread.join(timeout=first_response + 1 - time.monotonic())
              thread.stop()
  
      return found_zones or None
docs: Discover Sonos zones on the local network.
  
      Return a set of `SoCo` instances for each zone found.
      Include invisible zones (bridges and slave zones in stereo pairs if
      ``include_invisible`` is `True`. Will block for up to ``timeout`` seconds,
       after which return `None` if no zones found.
  
      Args:
          timeout (int, optional): block for this many seconds, at most.
              Defaults to 5.
          include_invisible (bool, optional): include invisible zones in the
              return set. Defaults to `False`.
          interface_addr (str or None): Discovery operates by sending UDP
              multicast datagrams. ``interface_addr`` is a string (dotted
              quad) representation of the network interface address to use as
              the source of the datagrams (i.e. it is a value for
              `socket.IP_MULTICAST_IF <socket>`). If `None` or not specified,
              all system interfaces will be tried. Defaults to `None`.
          all_households (bool, optional): wait for all replies to discover
              multiple households. If `False` or not specified, return only
              the first household found.
      Returns:
          set: a set of `SoCo` instances, one for each zone found, or else
              `None`.