Question

如何将蓝牙低功耗（BLE）设备与Android配对以读取加密数据。

使用Android BLE page中的信息，我能够发现设备，连接设备，发现服务并读取未加密的特征。

当我尝试读取加密特征（一个会导致iOS显示要求配对然后完成阅读的弹出窗口）时，我得到错误代码5 ，这对应于{{ 3}}。

我不确定如何使设备配对或如何为读取完成提供身份验证信息。

我通过尝试添加描述符来玩弄BluetoothGattCharacteristics，但这也不起作用任何帮助表示赞赏！

Answer 1

当您收到GATT_INSUFFICIENT_AUTHENTICATION错误时，系统会为您启动绑定过程。在下面的例子中，我试图在葡萄糖监测器上启用通知和指示。首先，我启用葡萄糖测量特征的通知，这可能导致错误出现。

@Override
    public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
        if (status == BluetoothGatt.GATT_SUCCESS) {
            if (GM_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onGlucoseMeasurementNotificationEnabled();

                if (mGlucoseMeasurementContextCharacteristic != null) {
                    enableGlucoseMeasurementContextNotification(gatt);
                } else {
                    enableRecordAccessControlPointIndication(gatt);
                }
            }

            if (GM_CONTEXT_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onGlucoseMeasurementContextNotificationEnabled();
                enableRecordAccessControlPointIndication(gatt);
            }

            if (RACP_CHARACTERISTIC.equals(descriptor.getCharacteristic().getUuid())) {
                mCallbacks.onRecordAccessControlPointIndicationsEnabled();
            }
        } else if (status == BluetoothGatt.GATT_INSUFFICIENT_AUTHENTICATION) {
            // this is where the tricky part comes

            if (gatt.getDevice().getBondState() == BluetoothDevice.BOND_NONE) {
                mCallbacks.onBondingRequired();

                // I'm starting the Broadcast Receiver that will listen for bonding process changes

                final IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_BOND_STATE_CHANGED);
                mContext.registerReceiver(mBondingBroadcastReceiver, filter);
            } else {
                // this situation happens when you try to connect for the second time to already bonded device
                // it should never happen, in my opinion
                Logger.e(TAG, "The phone is trying to read from paired device without encryption. Android Bug?");
                // I don't know what to do here
                // This error was found on Nexus 7 with KRT16S build of Andorid 4.4. It does not appear on Samsung S4 with Andorid 4.3.
            }
        } else {
            mCallbacks.onError(ERROR_WRITE_DESCRIPTOR, status);
        }
    };

mBondingBroadcastReceiver是：

private BroadcastReceiver mBondingBroadcastReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(final Context context, final Intent intent) {
        final BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        final int bondState = intent.getIntExtra(BluetoothDevice.EXTRA_BOND_STATE, -1);
        final int previousBondState = intent.getIntExtra(BluetoothDevice.EXTRA_PREVIOUS_BOND_STATE, -1);

        Logger.d(TAG, "Bond state changed for: " + device.getAddress() + " new state: " + bondState + " previous: " + previousBondState);

        // skip other devices
        if (!device.getAddress().equals(mBluetoothGatt.getDevice().getAddress()))
            return;

        if (bondState == BluetoothDevice.BOND_BONDED) {
            // Continue to do what you've started before
            enableGlucoseMeasurementNotification(mBluetoothGatt);

            mContext.unregisterReceiver(this);
            mCallbacks.onBonded();
        }
    }
};

请记住在退出活动时取消注册广播接收器。它可能没有被接收者本身注销。

Answer 2

我认为新的android 4.4提供了配对方法。同样的问题我已经面临所以等待更新和希望解决问题解决了createBond（）方法。

http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#setPairingConfirmation%28boolean%29

Answer 3

您可能需要检查内核smp.c文件，哪种方法可以调用它来进行配对。 1）密钥2）正常工作等。我想如果它能够调用MIMT和密钥安全级别，就不会有任何身份验证问题。确保将所有标志设置为调用SMP密钥方法。通过在smp.c文件中放置一些打印来跟踪。

在ICS中运行的解决方案：在android中使用btmgmt工具并将其挂钩在加密API中。使用密钥或任何其他方法。有用。您可能需要从最新的bluez代码中添加btmgmt中的密钥API。

Android蓝牙低能耗配对

3 个答案: