Velbus Cover: Assume state for VMBxBL modules (#109213)

homeassistant/components/velbus/cover.py

@@ -34,6 +34,7 @@ class VelbusCover(VelbusEntity, CoverEntity):
     """Representation a Velbus cover."""
 
     _channel: VelbusBlind
+    _assumed_closed: bool
 
     def __init__(self, channel: VelbusBlind) -> None:
         """Initialize the cover."""
@@ -51,11 +52,16 @@ class VelbusCover(VelbusEntity, CoverEntity):
                 | CoverEntityFeature.CLOSE
                 | CoverEntityFeature.STOP
             )
+            self._attr_assumed_state = True
+            # guess the state to get the open/closed icons somewhat working
+            self._assumed_closed = False
 
     @property
     def is_closed(self) -> bool | None:
         """Return if the cover is closed."""
-        return self._channel.is_closed()
+        if self._channel.support_position():
+            return self._channel.is_closed()
+        return self._assumed_closed
 
     @property
     def is_opening(self) -> bool:
@@ -83,11 +89,13 @@ class VelbusCover(VelbusEntity, CoverEntity):
     async def async_open_cover(self, **kwargs: Any) -> None:
         """Open the cover."""
         await self._channel.open()
+        self._assumed_closed = False
 
     @api_call
     async def async_close_cover(self, **kwargs: Any) -> None:
         """Close the cover."""
         await self._channel.close()
+        self._assumed_closed = True
 
     @api_call
     async def async_stop_cover(self, **kwargs: Any) -> None: