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CC2564 update connection interval from Android 4.3, 4.4

cao xuan phong
Prodigy 190 points
Other Parts Discussed in Thread: CC2564

Hello,

I have to send a huge file, about 200KB, from CC2564 to Android phone. In Android 5.0, transfer speed is good, about 4KB/s.
But in Android 4.3, transfer speed is just about 300B/s. From Android 5.0 I can use BluetoothGatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH);  to choose high speed transfer mode. So How I can do in Android 4.3? 

Thanks all.