@Override public void onCharacteristicRead( BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) { super.onCharacteristicRead(gatt, characteristic, status); Log.d(LOG_TAG, "onCharacteristicRead " + characteristic); if (readCallback != null) { if (status == BluetoothGatt.GATT_SUCCESS) { byte[] dataValue = characteristic.getValue(); String value = BleManager.bytesToHex(dataValue); if (readCallback != null) { readCallback.invoke(value); readCallback = null; } } else { readFailCallback.invoke("Error reading " + characteristic.getUuid() + " status=" + status); readFailCallback = null; } readCallback = null; } }