LE/Android: Pass list of advertised services found in scan record

Currently the advertising packet (scan record) received from BLE devices
during scanning on Android devices is ignored. Consequently, the
serviceUuids() method of the QBluetoothDeviceInfo class returns an empty
list for BLE devices. However, this list provides important information needed
by clients to identify whether a given device is of interest.

This changeset implements parsing of the scan record received from the
Android Bluetooth layer. The Java byte array is passed over JNI to the
C++ adapter classes, where it's parsed to find any service UUIDs being
advertised by the device.

Parsing the scan record ourselves is required for compatibility (Qt uses
"old-style" LE scan API from Android api level 18.)

All found UUIDs are added to a list which is subsequently passed to the
user of the QBluetoothDeviceDiscoveryAgent class via the
deviceDiscovered(QBluetoothDeviceInfo&) signal.

Note: not all Android devices pass the full advertisement data. The
service UUID list may be empty in those cases.

[ChangeLog][QtBluetooth][Android] Parse list of advertised services found in
LE scan record and pass them to API client via
QBluetoothDeviceInfo::serviceUuids()

Task-number: QTBUG-56625
Change-Id: I253f1b841c7b15b3bbabc9e478de87c81979815e
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/android/bluetooth/src/org/qtproject/qt5/android/bluetooth/QtBluetoothLE.java b/src/android/bluetooth/src/org/qtproject/qt5/android/bluetooth/QtBluetoothLE.java
index deb70dc0..9fe88e9c 100644
--- a/src/android/bluetooth/src/org/qtproject/qt5/android/bluetooth/QtBluetoothLE.java
+++ b/src/android/bluetooth/src/org/qtproject/qt5/android/bluetooth/QtBluetoothLE.java
@@ -114,11 +114,11 @@ public class QtBluetoothLE {
                     if (qtObject == 0)
                         return;
 
-                    leScanResult(qtObject, device, rssi);
+                    leScanResult(qtObject, device, rssi, scanRecord);
                 }
             };
 
-    public native void leScanResult(long qtObject, BluetoothDevice device, int rssi);
+    public native void leScanResult(long qtObject, BluetoothDevice device, int rssi, byte[] scanRecord);
 
     /*************************************************************/
     /* Service Discovery                                         */