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Commit 1f99a327 authored by Phil Burk's avatar Phil Burk
Browse files

BluetoothMidi: request higher priority, for lower latency 



Request a higher connection priority.
This will result in a Connection Interval below 15 msec
vs 45 msec for some devices.

Fix: 34710538
Test: Connect a BLE-MIDI device using the MIDI+BTLE test app. See bug.
Change-Id: I846a76a36c864f82969173a94d86b05059a786ad
Signed-off-by: default avatarPhil Burk <philburk@google.com>
parent 3a543a1b

media/packages/BluetoothMidiService/src/com/android/bluetoothmidiservice/BluetoothMidiDevice.java

+20 −20
Original line number Diff line number Diff line
@@ -100,8 +100,8 @@ public final class BluetoothMidiDevice { 
                int newState) {

            String intentAction;

            if (newState == BluetoothProfile.STATE_CONNECTED) {

                Log.i(TAG, "Connected to GATT server.");

                Log.i(TAG, "Attempting to start service discovery:" +

                Log.d(TAG, "Connected to GATT server.");

                Log.d(TAG, "Attempting to start service discovery:" +

                        mBluetoothGatt.discoverServices());

            } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {

                Log.i(TAG, "Disconnected from GATT server.");
@@ -112,24 +112,24 @@ public final class BluetoothMidiDevice { 
        @Override

        public void onServicesDiscovered(BluetoothGatt gatt, int status) {

            if (status == BluetoothGatt.GATT_SUCCESS) {

                List<BluetoothGattService> services = mBluetoothGatt.getServices();

                for (BluetoothGattService service : services) {

                    if (MIDI_SERVICE.equals(service.getUuid())) {

                BluetoothGattService service = gatt.getService(MIDI_SERVICE);

                if (service != null) {

                    Log.d(TAG, "found MIDI_SERVICE");

                        List<BluetoothGattCharacteristic> characteristics

                            = service.getCharacteristics();

                        for (BluetoothGattCharacteristic characteristic : characteristics) {

                            if (MIDI_CHARACTERISTIC.equals(characteristic.getUuid())) {

                    BluetoothGattCharacteristic characteristic

                            = service.getCharacteristic(MIDI_CHARACTERISTIC);

                    if (characteristic != null) {

                        Log.d(TAG, "found MIDI_CHARACTERISTIC");

                        mCharacteristic = characteristic;



                        // Request a lower Connection Interval for better latency.

                        boolean result = gatt.requestConnectionPriority(

                                BluetoothGatt.CONNECTION_PRIORITY_HIGH);

                        Log.d(TAG, "requestConnectionPriority(CONNECTION_PRIORITY_HIGH):"

                            + result);



                        // Specification says to read the characteristic first and then

                        // switch to receiving notifications

                        mBluetoothGatt.readCharacteristic(characteristic);

                                break;

                            }

                        }

                        break;

                    }

                }

            } else {