Improve node_type caching

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Ongoing
+
+- PR [342](https://github.com/plugwise/python-plugwise-usb/pull/342): Improve node_type chaching.
+
 ## 0.46.0 - 2025-09-12
 
 - PR [338](https://github.com/plugwise/python-plugwise-usb/pull/338): Append report interval to Sense node configuration

plugwise_usb/network/cache.py

@@ -28,10 +28,11 @@ async def save_cache(self) -> None:
         """Save the node information to file."""
         cache_data_to_save: dict[str, str] = {}
         for mac, node_type in self._nodetypes.items():
-            node_value = str(node_type)
-            cache_data_to_save[mac] = node_value
-        _LOGGER.debug("Save NodeTypes %s", str(len(cache_data_to_save)))
-        await self.write_cache(cache_data_to_save)
+            cache_data_to_save[mac] = node_type.name
+        _LOGGER.debug("Save NodeTypes for %s Nodes", (len(cache_data_to_save)))
+        await self.write_cache(
+            cache_data_to_save, True
+        )  # rewrite set to True is required
 
     async def clear_cache(self) -> None:
         """Clear current cache."""
@@ -44,11 +45,16 @@ async def restore_cache(self) -> None:
         self._nodetypes = {}
         for mac, node_value in data.items():
             node_type: NodeType | None = None
-            if len(node_value) >= 10:
+            # Backward-compatible parsing: support full enums, enum names, or numeric values
+            val = node_value.strip()
+            key = (val.split(".", 1)[1] if val.startswith("NodeType.") else val).upper()
+            node_type = NodeType.__members__.get(key)  # e.g., "CIRCLE"
+            if node_type is None:
                 try:
-                    node_type = NodeType[node_value[9:]]
-                except KeyError:
+                    node_type = NodeType(int(val))
+                except ValueError:
                     node_type = None
+
             if node_type is None:
                 _LOGGER.warning("Invalid NodeType in cache: %s", node_value)
                 continue
@@ -86,5 +92,9 @@ async def prune_cache(self, registry: list[str]) -> None:
                 continue
             if (node_type := self.get_nodetype(mac)) is not None:
                 new_nodetypes[mac] = node_type
+
+        if new_nodetypes == self._nodetypes:
+            _LOGGER.debug("prune_cache: no changes; skipping save")
+            return
         self._nodetypes = new_nodetypes
         await self.save_cache()

tests/test_usb.py

@@ -1712,9 +1712,9 @@ async def makedirs(cache_dir: str, exist_ok: bool) -> None:
 
         # test with valid data
         mock_read_data = [
-            "0123456789ABCDEF;NodeType.CIRCLE_PLUS",
+            "0123456789ABCDEF;CIRCLE_PLUS",
             "FEDCBA9876543210;NodeType.CIRCLE",
-            "1298347650AFBECD;NodeType.SCAN",
+            "1298347650AFBECD;6",
         ]
         file_chunks_iter = iter(mock_read_data)
         mock_file_stream = MagicMock(readlines=lambda *args, **kwargs: file_chunks_iter)
@@ -1733,10 +1733,10 @@ async def makedirs(cache_dir: str, exist_ok: bool) -> None:
             )
             mock_file_stream.writelines.assert_called_with(
                 [
-                    "0123456789ABCDEF;NodeType.CIRCLE_PLUS\n",
-                    "FEDCBA9876543210;NodeType.CIRCLE\n",
-                    "1298347650AFBECD;NodeType.SCAN\n",
-                    "1234ABCD4321FEDC;NodeType.STEALTH\n",
+                    "0123456789ABCDEF;CIRCLE_PLUS\n",
+                    "FEDCBA9876543210;CIRCLE\n",
+                    "1298347650AFBECD;SCAN\n",
+                    "1234ABCD4321FEDC;STEALTH\n",
                 ]
             )
         assert pw_nw_cache.nodetypes == {