Qt Bluetooth query when running on Linux with BlueZ

[ankurtyagi]

Hi,

I am using Qt5.4.1 on Linux with BlueZ4.101

When trying to connect to another slave device, I have following queries:

1. How does pairing happen ? I don't have agent running but still requestPairing(QBluetoothAddress(address), QBluetoothLocalDevice::AuthorizedPaired) succeeds.
2. I get following log during pairing:
   qt.bluetooth.bluez: OrgBluezDeviceInterface* getDevice(const QBluetoothAddress&, QBluetoothLocalDevicePrivate*) reply failed QDBusError("org.bluez.Error.DoesNotExist", "Does Not Exist")

I enabled logging in my app and here are the logs:

qt.bluetooth.bluez: Bluez 4 detected.
name: "test-bt" address: "78:A5:04:26:13:86" mode: 2
qt.bluetooth.bluez: OrgBluezDeviceInterface* getDevice(const QBluetoothAddress&, QBluetoothLocalDevicePrivate*) reply failed QDBusError("org.bluez.Error.DoesNotExist", "Does Not Exist")
[0627/052831:FATAL:at_exit.cc(53)] Check failed: false. Tried to RegisterCallback without an AtExitManager

qt.bluetooth.bluez: void QBluetoothLocalDevicePrivate::Release()
BT slave device: "00:02:72:E3:0F:7F" Paired
qt.bluetooth: Starting discovery
qt.bluetooth: UUID filter ("{00001101-0000-1000-8000-00805f9b34fb}")
qt.bluetooth.bluez: Discovery on: "00:02:72:E3:0F:7F" Mode: 1
qt.bluetooth.bluez: void QBluetoothServiceDiscoveryAgentPrivate::_q_createdDevice(QDBusPendingCallWatcher*) created "00:02:72:E3:0F:7F"
qt.bluetooth.bluez: Discovered BLE-only device. Normal service discovery skipped.
qt.bluetooth.bluez: Discovered service "{00001101-0000-1000-8000-00805f9b34fb}" 1
(1) Sequence
(1) uuid 1101
(4) Sequence
(4) Sequence
(4) uuid 0100
(4) Sequence
(4) uuid 0007
(256) string Serial Port Profile
qt.bluetooth: FOUND SERVICE!
qt.bluetooth: Could not find port/psm for potential remote service
qt.bluetooth: Socket discovery finished
qt.bluetooth: Didn't find any
qt.bluetooth.bluez: "Method "GetProperties" with signature "" on interface "org.bluez.Device" doesn't exist

Can someone please explain whats happening here ?

thanks
Ankur