Bluetooth Serial communication slow

[theJoey]

I am working on implementing your library into an android app but I am facing a performance issue.
When I use your app (xbee on google play) I can send at least 10 commands per second through the serial interface
However, when I use your library, I can only send 5 commands per seconds with this method :

mXBeeDevice.sendUserDataRelay(
XBeeLocalInterface.SERIAL,
data
)

I followed your github example so I have no idea where the issue comes from.

Can you give me a clue about what happened please?

[DanielLazarHTDM]

Hi theJoey,

well I had same impression.

than I've put into:
xbee_android_library/src/main/java/com/digi/xbee/api/android/connection/bluetooth/AndroidBluetoothInterface.java

bluetoothGatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH);

To boost it and after that instead of about 100 ms per write it is able to write 30 ms. Check following log every frame received in serial console.

12-28 16:33:24.642 23047 23047 I PERFORMANCE: 30 [ms] 91226 bytes
12-28 16:33:24.672 23047 23047 I PERFORMANCE: 30 [ms] 91459 bytes
12-28 16:33:24.702 23047 23047 I PERFORMANCE: 30 [ms] 91692 bytes
12-28 16:33:24.733 23047 23047 I PERFORMANCE: 31 [ms] 91925 bytes
12-28 16:33:24.763 23047 23047 I PERFORMANCE: 29 [ms] 92158 bytes
12-28 16:33:24.792 23047 23047 I PERFORMANCE: 29 [ms] 92391 bytes
12-28 16:33:24.822 23047 23047 I PERFORMANCE: 30 [ms] 92624 bytes
12-28 16:33:24.852 23047 23047 I PERFORMANCE: 30 [ms] 92857 bytes
12-28 16:33:24.882 23047 23047 I PERFORMANCE: 30 [ms] 93090 bytes
12-28 16:33:24.883 23047 23047 I PERFORMANCE: Total: 12481 [ms] 93090 bytes => 7.458536976203829 kB/s

Cheers,
Dan