C＃Detect按钮按下Windows Phone Project中的蓝牙设备

Question

我有蓝牙手写笔设备。它上面有三个按钮：电源/通话，音量增大，音量减小。在我的Windows手机上运行的C＃项目与手写笔配对时，如何检测其中一个按钮何时被按下？

注意：我已经可以在代码中看到设备：

BluetoothDevice currentDevice { get; set; }
string deviceName = "P1";
protected async override void OnNavigatedTo(NavigationEventArgs e)
{
    foreach (DeviceInformation di in await DeviceInformation.FindAllAsync(BluetoothDevice.GetDeviceSelector()))
    {
        BluetoothDevice bdDevice = await BluetoothDevice.FromIdAsync(di.Id);
        if (bdDevice.Name == deviceName)
        {
            currentDevice = bdDevice;
            //OK, so now what do I do to listen for the button clicks???
        }
    }
}