Как остановить функцию if, если внутри нее функция не выдает true/false в течение 16 секунд

public const string EksisDLL = "EksisExchange.dll";
 
[DllImport(EksisDLL, CharSet = CharSet.Ansi, SetLastError = true, CallingConvention = CallingConvention.StdCall)]
        public static extern bool EKSIS_Bluetooth_Read(string aPortNum, char aMem, uint aAddr, byte[] aData, ushort aCount);
 
static void Main(string[] args)
{
            string PortNum = "COM4";
            char Mem = 'R';
            uint Addr = 0x0;
            byte[] Data = new byte[254];
            ushort Count = 12;
            float MeasuringTemp;
            float MeasuringHumidy;
            float MeasuringPressure;
            string tech = null;
            float period;
 
            if (EKSIS_Bluetooth_Read("COM4", Mem, Addr, Data, Count))
            {
                MeasuringTemp = BitConverter.ToSingle(Data, 0);
 
                MeasuringHumidity = BitConverter.ToSingle(Data, 4);
 
                MeasuringPressure = BitConverter.ToSingle(Data, 8);
 
                Console.Write("Result: " + MeasuringTemp + " " + MeasuringHumidity + " " + MeasuringPressure + "\r\n");
            }
}

var cs = CancellationTokenSource(16000);
try
{
    bool result = await LookForDevice("COM4", cs.Token);
    if (result)
        Console.WriteLine("Device available on COM4");
}
catch (OperationCancellationException)
{
    Console.WriteLine("Device not available");
}
 
// ...
 
Task<bool> LookForDevice(string port, CancellationToken ct)
{
    return Task.Run(() => EKSIS_Bluetooth_Read(port, /* ... */), ct);
}