config: store the protocol used by the device in the config file

Instead of having to detect the protocol multiple times, we should just
store it once so we can detect oddities when they arrive.

tuhi/base.py

@@ -167,7 +167,10 @@ class TuhiDevice(GObject.Object):
         self._tuhi_dbus_device.notify_button_press_required()
 
     def _on_uuid_updated(self, wacom_device, pspec, bluez_device):
-        self.config.new_device(bluez_device.address, wacom_device.uuid)
+        protocol = TuhiConfig.Protocol.SLATE
+        if wacom_device.is_spark():
+            protocol = TuhiConfig.Protocol.SPARK
+        self.config.new_device(bluez_device.address, wacom_device.uuid, protocol)
         self.registered = True
 
     def _on_listening_updated(self, dbus_device, pspec):
@@ -287,7 +290,7 @@ class Tuhi(GObject.Object):
             if uuid is None:
                 logger.info(f'{bluez_device.address}: device without config, must be registered first')
                 return
-            logger.debug(f'{bluez_device.address}: UUID {uuid}')
+            logger.debug(f'{bluez_device.address}: UUID {uuid} protocol: {config["Protocol"]}')
 
         # create the device if unknown from us
         if bluez_device.address not in self.devices:

tuhi/config.py

@@ -16,6 +16,7 @@ from gi.repository import GObject
 import xdg.BaseDirectory
 import os
 import configparser
+import enum
 import re
 import logging
 from .drawing import Drawing
@@ -30,6 +31,13 @@ def is_btaddr(addr):
 
 
 class TuhiConfig(GObject.Object):
+
+    class Protocol(enum.Enum):
+        UNKNOWN = 0
+        SPARK = 1
+        SLATE = 2
+        INTUOS_PRO = 3
+
     def __init__(self):
         GObject.Object.__init__(self)
         try:
@@ -67,9 +75,11 @@ class TuhiConfig(GObject.Object):
                 self._purge_drawings(entry)
 
                 assert config['Device']['Address'] == entry.name
+                if 'Protocol' not in config['Device']:
+                    config['Device']['Protocol'] = str(TuhiConfig.Protocol.UNKNOWN)
                 self._devices[entry.name] = config['Device']
 
-    def new_device(self, address, uuid):
+    def new_device(self, address, uuid, protocol):
         assert is_btaddr(address)
         assert len(uuid) == 12
 
@@ -92,6 +102,7 @@ class TuhiConfig(GObject.Object):
         config['Device'] = {
             'Address': address,
             'UUID': uuid,
+            'Protocol': protocol,
         }
 
         with open(path, 'w') as configfile: