bluetooth - Android BLE sending message using synchronized method -

i need send message custom device via ble.

i able send message below 20 bytes. used just:

 public boolean writecharacteristic(byte[] value){          if (mbluetoothgatt == null) {             log.e(tag, "lost connection");             return false;         }         bluetoothgattservice service = mbluetoothgatt.getservice(uuid_service_generic_attribute);         if (service == null) {             log.e(tag, "service not found!");             return false;         }         bluetoothgattcharacteristic charac = service.getcharacteristic(uuid_write);         if (charac == null) {             log.e(tag, "char not found!");             return false;         }          charac.setvalue(value);         boolean status = mbluetoothgatt.writecharacteristic(charac);         return status;     } 

but need send longer message in "as short time possible". found: android: sending data >20 bytes ble

but need use synchronized method , oncharacteristicwrite (this should fastest way).

i found: http://blog.stylingandroid.com/bluetooth-le-part-6/, not clear me.

do have easy example how send message via ble using synchronized methods?