winrt: implement BleakScanner service_uuids kwarg

This provides an implementation for the BleakScanner service_uuids
kwarg in the WinRT backend. As explained in the code comment, it is
not possible to use the OS-provided filter mechanism for technical
reasons.

Fixes #230

CHANGELOG.rst

@@ -14,7 +14,7 @@ Added
 -----
 
 * Added ``service_uuids`` kwarg to ``BleakScanner``. This can be used to work
- around issue of scanning not working on macOS 12. Issue #635.
+ around issue of scanning not working on macOS 12. Fixes #230. Works around #635.
 
 Changed
 -------

bleak/backends/winrt/scanner.py

@@ -106,6 +106,20 @@ def _received_handler(
  # Get a "BLEDevice" from parse_event args
  device = self._parse_adv_data(raw_data)
 
+ # On Windows, we have to fake service UUID filtering. If we were to pass
+ # a BluetoothLEAdvertisementFilter to the BluetoothLEAdvertisementWatcher
+ # with the service UUIDs appropriately set, we would no longer receive
+ # scan response data (which commonly contains the local device name).
+ # So we have to do it like this instead.
+
+ if self._service_uuids:
+ for uuid in device.metadata["uuids"]:
+ if uuid in self._service_uuids:
+ break
+ else:
+ # if there were no matching service uuids, the don't call the callback
+ return
+
  service_data = {}
 
  # Decode service data