wacom: load the protocol of the device from the config file

We can store this once for all, which will allow to keep the logic
of detecting the protocol while registering only

tuhi/base.py

@@ -134,7 +134,7 @@ class TuhiDevice(GObject.Object):
     def _on_bluez_device_connected(self, bluez_device):
         logger.debug(f'{bluez_device.address}: connected')
         if self._wacom_device is None:
-            self._wacom_device = WacomDevice(bluez_device, self._uuid)
+            self._wacom_device = WacomDevice(bluez_device, self.config)
             self._wacom_device.connect('drawing', self._on_drawing_received)
             self._wacom_device.connect('done', self._on_fetching_finished, bluez_device)
             self._wacom_device.connect('button-press-required', self._on_button_press_required)

tuhi/wacom.py

@@ -118,7 +118,7 @@ class WacomDevice(GObject.Object):
             (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_INT, GObject.TYPE_BOOLEAN)),
     }
 
-    def __init__(self, device, uuid=None):
+    def __init__(self, device, config):
         GObject.Object.__init__(self)
         self.device = device
         self.nordic_answer = None
@@ -127,10 +127,23 @@ class WacomDevice(GObject.Object):
         self.width = WACOM_SLATE_WIDTH
         self.height = WACOM_SLATE_HEIGHT
         self.name = device.name
-        self._uuid = uuid
+        self._config = None
         self.fw_logger = logging.getLogger('tuhi.fw')
         self._is_running = False
 
+        try:
+            self._config = config.devices[device.address]
+        except KeyError:
+            self._uuid = None
+            self._wacom_protocol = None
+        else:
+            self._uuid = self._config['uuid']
+            try:
+                self._protocol = next(p for p in Protocol if p.value == self._config['Protocol'])
+            except StopIteration:
+                logger.error(f'Unknown protocol in configuration: {self._config["Protocol"]}')
+                raise WacomCorruptDataException(f'Unknown Protocol {self._config["Protocol"]}')
+
         device.connect_gatt_value(WACOM_CHRC_LIVE_PEN_DATA_UUID,
                                   self._on_pen_data_changed)
         device.connect_gatt_value(WACOM_OFFLINE_CHRC_PEN_DATA_UUID,