attempts to fix mypy issues

meshtastic/__main__.py

@@ -104,7 +104,7 @@ def getPref(node, comp_name) -> bool:
     for config in [localConfig, moduleConfig]:
         objDesc = config.DESCRIPTOR
         config_type = objDesc.fields_by_name.get(name[0])
-        pref = False		#FIXME - checkme - Used here as boolean, but set 2 lines below as a string.
+        pref = ""		#FIXME - is this correct to leave as an empty string if not found?
         if config_type:
             pref = config_type.message_type.fields_by_name.get(snake_name)
             if pref or wholeField:

meshtastic/ble_interface.py

@@ -151,7 +151,7 @@ class BLEInterface(MeshInterface):
             )
         return addressed_devices[0]
 
-    def _sanitize_address(address: Optional[str]) -> Optional[str]:  # pylint: disable=E0213
+    def _sanitize_address(self, address: Optional[str]) -> Optional[str]:  # pylint: disable=E0213
         "Standardize BLE address by removing extraneous characters and lowercasing."
         if address is None:
             return None

meshtastic/serial_interface.py

@@ -58,7 +58,7 @@ class SerialInterface(StreamInterface):
         self.stream = serial.Serial(
             self.devPath, 115200, exclusive=True, timeout=0.5, write_timeout=0
         )
-        self.stream.flush()
+        self.stream.flush()	# type: ignore[attr-defined]
         time.sleep(0.1)
 
         StreamInterface.__init__(