question: private boolean writeToCharacteristic ( BluetoothGattCharacteristic charc , byte [ ] data ) { charc . setValue ( data ) ; boolean result = mGattClient . writeCharacteristic ( charc ) ; if ( result ) { Log . d ( TAG , "Wrote to characteristic: " + charc . getUuid ( ) + ", data: " + Arrays . toString ( data ) ) ; } else { Log . e ( TAG , "Write failed to characteristic: " + charc . getUuid ( ) + ", data: " + Arrays . toString ( data ) ) ; } return result ; }
target:  Write to a OAD characteristic