Start discovery mode when one device requests it

We need to check when the discovery stops (timeout from StartSearch)
if we should keep the discover one or not.

tuhi.py

@@ -118,8 +118,9 @@ class TuhiDevice(GObject.Object):
         assert self._tuhi_dbus_device is None
         self._tuhi_dbus_device = device
         self._tuhi_dbus_device.connect('pair-requested', self._on_pair_requested)
+        self._tuhi_dbus_device.connect('notify::listening', self._on_listening_updated)
 
-    @property
+    @GObject.Property
     def listening(self):
         return self._tuhi_dbus_device.listening
 
@@ -186,6 +187,9 @@ class TuhiDevice(GObject.Object):
         self.config.new_device(bluez_device.address, wacom_device.uuid)
         self.paired = True
 
+    def _on_listening_updated(self, dbus_device, pspec):
+        self.notify('listening')
+
 
 class Tuhi(GObject.Object):
     __gsignals__ = {
@@ -246,6 +250,9 @@ class Tuhi(GObject.Object):
         if self._search_stop_handler is not None:
             self._search_stop_handler(0)
 
+        # 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):
         if bluez_device.vendor_id != WACOM_COMPANY_ID:
             return
@@ -266,6 +273,7 @@ class Tuhi(GObject.Object):
         if bluez_device.address not in self.devices:
                 d = TuhiDevice(bluez_device, self.config, uuid=uuid, paired=not pairing_device)
                 d.dbus_device = self.server.create_device(d)
+                d.connect('notify::listening', self._on_listening_updated)
                 self.devices[bluez_device.address] = d
 
         d = self.devices[bluez_device.address]
@@ -275,6 +283,18 @@ class Tuhi(GObject.Object):
         elif d.listening:
             d.connect_device()
 
+    def _on_listening_updated(self, tuhi_dbus_device, pspec):
+        listen = False
+        for dev in self.devices.values():
+            if dev.listening:
+                listen = True
+                break
+
+        if listen:
+            self.bluez.start_discovery()
+        else:
+            self.bluez.stop_discovery()
+
 
 def main(args):
     desc = "Daemon to extract the pen stroke data from Wacom SmartPad devices"

tuhi/dbusserver.py

@@ -232,8 +232,8 @@ class TuhiDBusDevice(GObject.Object):
         self._listening_client = (sender, s)
         logger.debug('Listening started on {} for {}'.format(self.name, sender))
 
-        # FIXME: notify the server to start discovery
-        self.listening = True
+        self._listening = True
+        self.notify('listening')
 
     def _on_name_owner_changed_signal_cb(self, connection, sender, object_path,
                                          interface_name, node,
@@ -252,13 +252,14 @@ class TuhiDBusDevice(GObject.Object):
         self._listening_client = None
         logger.debug('Listening stopped on {} for {}'.format(self.name, sender))
 
-        # FIXME: notify the server to stop discovery
+        self.notify('listening')
 
         status = GLib.Variant.new_int32(0)
         status = GLib.Variant.new_tuple(status)
         connection.emit_signal(sender, self.objpath, INTF_DEVICE,
                                "ListeningStopped", status)
         self.listening = False
+        self.notify('listening')
 
     def _json_data(self, args):
         index = args[0]