Ble-getting错误代码 - 128写入charactertic时

Question

我正在使用以下反应库react-native-ble-manager

我试图在BLE设备上执行读写操作.我成功地执行了读操作.但是在写入BLE设备时我收到错误代码128.

首先,我正在启用特征通知 -

BleManager.startNotification(peripheralId, serviceId, characteristicId)

写是这样的 -
将'hex'值转换为base64字符串 -

  const base64String = new Buffer('0x00B00050D0', 'hex').toString('base64');

  BleManager.write(peripheralId, serviceId, characteristicId, base64Value)

写操作返回错误代码-128

:(

UPDATE - 这是用于启动通知和写入值的代码片段 - 完整文件可在此处找到 - BluetoothLeService.java

public void writeCharacteristic(BleCharacteristic bleCharacteristic, String inputValue) {

    if (mBluetoothAdapter == null || mBluetoothGatt == null) {
        Log.w(TAG, "BluetoothAdapter not initialized");
        return;
    }

    if (!bleCharacteristic.isNotificationStarted()) {
        Log.w(TAG, "Notification not started please start notification");
        return;
    }

    BluetoothGattCharacteristic bluetoothGattCharacteristic = bleCharacteristic.getBluetoothGattCharacteristic();
    bluetoothGattCharacteristic.setValue(inputValue);
    mBluetoothGatt.writeCharacteristic(bluetoothGattCharacteristic);
}

public void setCharacteristicNotification(BleCharacteristic bleCharacteristic) {
    if (mBluetoothAdapter == null || mBluetoothGatt == null) {
        Log.w(TAG, "BluetoothAdapter not initialized");
        return;
    }
    boolean enable = !bleCharacteristic.isNotificationStarted();
    Log.d(TAG, "setCharacteristicNotification(device=" + mBluetoothDeviceAddress + ", UUID="
            + bleCharacteristic.getUUID().toString() + ", enable=" + enable + " )");
    BluetoothGattCharacteristic characteristic = mBluetoothGatt.getService(bleCharacteristic.getServiceUUID()).getCharacteristic(bleCharacteristic.getUUID());
    mBluetoothGatt.setCharacteristicNotification(characteristic, enable);
    BluetoothGattDescriptor descriptor = characteristic.getDescriptor(UUID.fromString(SampleGattAttributes.CLIENT_CHARACTERISTIC_CONFIG));
    descriptor.setValue(enable ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : new byte[]{0x00, 0x00});
    boolean result = mBluetoothGatt.writeDescriptor(descriptor);
    bleCharacteristic.setNotificationStarted(result);
    Log.d(TAG, "setCharacteristicNotification(device=" + mBluetoothDeviceAddress + ", UUID="
            + bleCharacteristic.getUUID().toString() + ", enabled=" + result + " )");
}

Answer 1

这是一个无资源错误。你确定你写了描述符吗？如果您不设置描述符 (BluetoothGattDescriptor) 并仅调用 write，您将收到此错误。

这是一个例子：

protected static final UUID CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID = UUID.fromString("00002902-0000-1000-8000-00805f9b34fb");

public boolean setCharacteristicNotification(BluetoothDevice device, UUID serviceUuid, UUID characteristicUuid,
        boolean enable) {
    if (IS_DEBUG)
        Log.d(TAG, "setCharacteristicNotification(device=" + device.getName() + device.getAddress() + ", UUID="
                + characteristicUuid + ", enable=" + enable + " )");
    BluetoothGatt gatt = mGattInstances.get(device.getAddress()); //I just hold the gatt instances I got from connect in this HashMap
    BluetoothGattCharacteristic characteristic = gatt.getService(serviceUuid).getCharacteristic(characteristicUuid);
    gatt.setCharacteristicNotification(characteristic, enable);
    BluetoothGattDescriptor descriptor = characteristic.getDescriptor(CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);
    descriptor.setValue(enable ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : new byte[] { 0x00, 0x00 });
    return gatt.writeDescriptor(descriptor); //descriptor write operation successfully started? 
}

来源