code cleanup

custom_components/bluetti_bt/binary_sensor.py

@@ -99,7 +99,7 @@ class BluettiBinarySensor(CoordinatorEntity, BinarySensorEntity):
     def _handle_coordinator_update(self) -> None:
         """Handle updated data from the coordinator."""
 
-        if self.coordinator.persistent_conn and not self.coordinator.client.is_connected:
+        if self.coordinator.reader.persistent_conn and not self.coordinator.reader.client.is_connected:
             return
 
         _LOGGER.debug("Updating state of %s", unique_id_loggable(self._attr_unique_id))