CR: Fix typo in docstring

CR: Fix incorrect bitwise operator for dirty flag
CR: Fix boolean cache retrieval logic

Author: dirixmjm

plugwise_usb/nodes/node.py

@@ -659,9 +659,9 @@ def _get_cache_as_bool(self, setting: str) -> bool | None:
         """Retrieve bool of specified setting from cache memory."""
         if not self._cache_enabled:
             return None
-        if self._node_cache.get_state(setting) == "True":
-            return True
-        return False
+        if (bool_value := self._node_cache.get_state(setting)) is None:
+            return None
+        return bool_value == "True"
 
     def _get_cache_as_datetime(self, setting: str) -> datetime | None:
         """Retrieve value of specified setting from cache memory and return it as datetime object."""

plugwise_usb/nodes/scan.py

@@ -164,7 +164,7 @@ async def _load_from_cache(self) -> bool:
         if (sensitivity_level := self._sensitivity_level_from_cache()) is None:
             dirty = True
             sensitivity_level = DEFAULT_SENSITIVITY
-        dirty &= self._motion_config_dirty_from_cache()
+        dirty |= self._motion_config_dirty_from_cache()
 
         self._motion_config = MotionConfig(
             daylight_mode=daylight_mode,

plugwise_usb/nodes/sed.py

@@ -161,7 +161,7 @@ async def _load_from_cache(self) -> bool:
         if (sleep_duration := self._sleep_duration_from_cache()) is None:
             dirty = True
             sleep_duration = SED_DEFAULT_SLEEP_DURATION
-        dirty &= self._sed_config_dirty_from_cache()
+        dirty |= self._sed_config_dirty_from_cache()
         self._battery_config = BatteryConfig(
             awake_duration=awake_duration,
             clock_interval=clock_interval,
@@ -331,7 +331,7 @@ async def set_sleep_duration(self, minutes: int) -> bool:
     # region Properties
     @property
     def dirty(self) -> int:
-        """Battry configuration dirty flag."""
+        """Battery configuration dirty flag."""
         return self._battery_config.dirty
 
     @property