new_contents: """Discover Xiaomi Mi Home (aka Lumi) Gateways."""
  from . import MDNSDiscoverable
  from ..const import ATTR_MAC_ADDRESS, ATTR_PROPERTIES
  
  
  # pylint: disable=too-few-public-methods
  class Discoverable(MDNSDiscoverable):
      """Add support for discovering Xiaomi Gateway"""
  
      def __init__(self, nd):
          """Initialize the discovery."""
          super(Discoverable, self).__init__(nd, '_miio._udp.local.')
  
      def info_from_entry(self, entry):
          """Return most important info from mDNS entries."""
          info = super().info_from_entry(entry)
  
          # Workaround of misparsing of mDNS properties. It's unclear
          # whether it's bug in zeroconf module or in the Gateway, but
          # returned properties look like:
          # {b'poch': b'0:mac=286c07aaaaaa\x00'} instead of expected:
          # {b'epoch': b'0', b'mac': '286c07aaaaaa'}
          if "poch" in info[ATTR_PROPERTIES]:
              misparsed = info[ATTR_PROPERTIES]["poch"]
              misparsed = misparsed.rstrip("\0")
              for val in misparsed.split(":"):
                  if val.startswith("mac="):
                      info[ATTR_MAC_ADDRESS] = val[len("mac="):]
  
          return info
  
      def get_entries(self):
          """Return Xiaomi Gateway devices."""
          return self.find_by_device_name('lumi-gateway-')
  
subject: Add Xiaomi Mi Home Gateway discovery. (#144)