text: """
  Support for Tellstick covers.
  
  For more details about this platform, please refer to the documentation at
  https://home-assistant.io/components/cover.tellstick/
  """
  
  
  from homeassistant.components.cover import CoverDevice
  from homeassistant.components.tellstick import (
      DEFAULT_SIGNAL_REPETITIONS, ATTR_DISCOVER_DEVICES, ATTR_DISCOVER_CONFIG,
      DATA_TELLSTICK, TellstickDevice)
  
  
  def setup_platform(hass, config, add_devices, discovery_info=None):
      """Set up the Tellstick covers."""
      if (discovery_info is None or
              discovery_info[ATTR_DISCOVER_DEVICES] is None):
          return
  
      signal_repetitions = discovery_info.get(
          ATTR_DISCOVER_CONFIG, DEFAULT_SIGNAL_REPETITIONS)
  
      add_devices([TellstickCover(hass.data[DATA_TELLSTICK][tellcore_id],
                                  signal_repetitions)
                   for tellcore_id in discovery_info[ATTR_DISCOVER_DEVICES]],
                  True)
  
  
  class TellstickCover(TellstickDevice, CoverDevice):
      """Representation of a Tellstick cover."""
  
      @property
      def is_closed(self):
          """Return the current position of the cover is not possible."""
          return None
  
      @property
      def assumed_state(self):
          """Return True if unable to access real state of the entity."""
          return True
  
      def close_cover(self, **kwargs):
          """Close the cover."""
          self._tellcore_device.down()
  
      def open_cover(self, **kwargs):
          """Open the cover."""
          self._tellcore_device.up()
  
      def stop_cover(self, **kwargs):
          """Stop the cover."""
          self._tellcore_device.stop()
  
      def _parse_tellcore_data(self, tellcore_data):
          """Turn the value received from tellcore into something useful."""
          pass
  
      def _parse_ha_data(self, kwargs):
          """Turn the value from HA into something useful."""
          pass
  
      def _update_model(self, new_state, data):
          """Update the device entity state to match the arguments."""
          pass
  