ble: drop the 'event' argument from device-added

An 'event' boolean is less than obvious ('is-event' may be better). This
signalled the difference between a device-added during Manager startup and the
device-added at runtime (i.e. device goes online).

We don't need that differentiation. The manager adds all existing devices
immediately after connnect_to_bluez(). All we have to do is run through the
device list, add them locally and then subscribe to the signal.

This keeps the is-event confusion within one file only instead of spreading it
across two and an internal API. And we can re-name it to hotplugged.

tuhi/base.py

@@ -231,8 +231,6 @@ class Tuhi(GObject.Object):
         self.server.connect('search-start-requested', self._on_start_search_requested)
         self.server.connect('search-stop-requested', self._on_stop_search_requested)
         self.bluez = BlueZDeviceManager()
-        self.bluez.connect('device-added', self._on_bluez_device_updated)
-        self.bluez.connect('device-updated', self._on_bluez_device_updated)
         self.bluez.connect('discovery-started', self._on_bluez_discovery_started)
         self.bluez.connect('discovery-stopped', self._on_bluez_discovery_stopped)
 
@@ -245,6 +243,11 @@ class Tuhi(GObject.Object):
 
     def _on_tuhi_bus_name_acquired(self, dbus_server):
         self.bluez.connect_to_bluez()
+        for dev in self.bluez.devices:
+            self._add_device(self.bluez, dev)
+
+        self.bluez.connect('device-added', self._on_bluez_device_updated)
+        self.bluez.connect('device-updated', self._on_bluez_device_updated)
 
     def _on_tuhi_bus_name_lost(self, dbus_server):
         self.mainloop.quit()
@@ -282,7 +285,7 @@ class Tuhi(GObject.Object):
         # restart discovery if some users are already in the listening mode
         self._on_listening_updated(None, None)
 
-    def _on_bluez_device_updated(self, manager, bluez_device, event=True):
+    def _add_device(self, manager, bluez_device, hotplugged=False):
         uuid = None
 
         # check if the device is already known by us
@@ -295,11 +298,11 @@ class Tuhi(GObject.Object):
         if uuid is None and bluez_device.vendor_id not in WACOM_COMPANY_IDS:
             return
 
-        # if event is set, the device has been 'hotplugged' in the bluez stack
+        # if the device has been 'hotplugged' in the bluez stack,
-        # so ManufacturerData is reliable. Else, consider the device not in
+        # ManufacturerData is reliable. Else, consider the device not in
-        # the register mode
+        # register mode
         register_mode = False
-        if event:
+        if hotplugged:
             register_mode = Tuhi._device_in_register_mode(bluez_device)
 
         if not register_mode:
@@ -323,6 +326,9 @@ class Tuhi(GObject.Object):
         elif d.listening:
             d.listen()
 
+    def _on_bluez_device_updated(self, manager, bluez_device):
+        self._add_device(manager, bluez_device, True)
+
     def _on_listening_updated(self, tuhi_dbus_device, pspec):
         listen = self._search_stop_handler is not None
         for dev in self.devices.values():

tuhi/ble.py

@@ -291,7 +291,7 @@ class BlueZDeviceManager(GObject.Object):
     '''
     __gsignals__ = {
         'device-added':
-            (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT, GObject.TYPE_BOOLEAN)),
+            (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT,)),
         'device-updated':
             (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT,)),
         'discovery-started':
@@ -326,7 +326,7 @@ class BlueZDeviceManager(GObject.Object):
         # object path length and process them in order, this way we're
         # guaranteed that the objects we need already exist.
         for obj in self._om.get_objects():
-            self._process_object(obj, event=False)
+            self._process_object(obj)
 
     def _discovery_timeout_expired(self):
         self.stop_discovery()
@@ -428,7 +428,7 @@ class BlueZDeviceManager(GObject.Object):
         if obj.get_interface(ORG_BLUEZ_ADAPTER1) is not None:
             self._process_adapter(obj)
         elif obj.get_interface(ORG_BLUEZ_DEVICE1) is not None:
-            self._process_device(obj, event)
+            self._process_device(obj)
         elif obj.get_interface(ORG_BLUEZ_GATTCHARACTERISTIC1) is not None:
             return True
 
@@ -438,11 +438,11 @@ class BlueZDeviceManager(GObject.Object):
         objpath = obj.get_object_path()
         logger.debug(f'Adapter: {objpath}')
 
-    def _process_device(self, obj, event=True):
+    def _process_device(self, obj):
         dev = BlueZDevice(self._om, obj)
         self.devices.append(dev)
         dev.connect('updated', self._on_device_updated)
-        self.emit('device-added', dev, event)
+        self.emit('device-added', dev)
 
     def _process_characteristic(self, obj):
         objpath = obj.get_object_path()