retv_if(object_path == NULL, BLUETOOTH_ERROR_INTERNAL);
proxy = g_dbus_proxy_new_sync(gconn, G_DBUS_PROXY_FLAGS_NONE, NULL,
BT_BLUEZ_NAME, object_path, BT_PROPERTIES_INTERFACE, NULL,
&err);
retv_if(object_path == NULL, BLUETOOTH_ERROR_INTERNAL);
proxy = g_dbus_proxy_new_sync(gconn, G_DBUS_PROXY_FLAGS_NONE, NULL,
BT_BLUEZ_NAME, object_path, BT_PROPERTIES_INTERFACE, NULL,
&err);