Question

在我的应用程序中执行以下代码：

gatt[0] = bluetoothAdapter.getRemoteDevice(macAddress).connectGatt(context, true, new AbstractCallback(subscriber) {
                @Override
                public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
                ... // do something with new characteristic value
                }
            })

AbstractCallback的位置是：

 private abstract class AbstractScaleCallback extends BluetoothGattCallback {

    ... // fields and constants

    private final byte[] TURN_ON_COMMAND = ...
    private static final String COMMAND_CHARACTERISTIC_UUID = ...

    private BluetoothGattCharacteristic commandCharacteristic;
    private Subscription subscriber;

    AbstractScaleCallback(Subscription subscriber) {
        this.subscriber = subscriber;
    }

    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        if (newState == BluetoothProfile.STATE_CONNECTED) {
            gatt.discoverServices();
        } else if (newState == BluetoothProfile.STATE_DISCONNECTED) {
            gatt.close();
        }
    }

    @Override
    public void onServicesDiscovered(BluetoothGatt gatt, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            ... // find other characteristics

            commandCharacteristic = measurementService.getCharacteristic(UUID.fromString(COMMAND_CHARACTERISTIC_UUID));
            commandCharacteristic.setValue(TURN_ON_COMMAND);
            gatt.writeCharacteristic(commandCharacteristic);
        }
    }

    @Override
    public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
        if (characteristic.getUuid().equals(UUID.fromString(COMMAND_CHARACTERISTIC_UUID)) && Arrays.equals(characteristic.getValue(), TURN_ON_COMMAND)) {
            if (status == BluetoothGatt.GATT_SUCCESS) {
                ... // set up characteristic notifications
            } else {
                ... // throw error
            }
        }
    }
}

在我的所有测试设备上，代码从应用程序端产生相同的结果 - 所有回调都按正确的顺序调用， gatt.writeCharacteristic（commandCharacteristic）方法返回＆＃39; true＆＃39 ;.但似乎在某些设备上，外围设备的特征值保持不变。即便如此，特征变更通知似乎也可行从我发现的，所有有问题的设备似乎共享相同系列的SoC - Snapdragon 600 有谁知道可能是什么问题以及如何解决它？

无法在某些设备上写出BLE gatt特性

0 个答案: