MissionPlanner.Comms.SerialPort.toggleDTR C# (CSharp) Method

        public void toggleDTR()
        {
            if (ispx4(this.PortName))
            {
                Console.WriteLine("PX4 - no DTR");
                return;
            }


            bool open = this.IsOpen;
            Console.WriteLine("toggleDTR " + this.IsOpen);
            try
            {
                if (!open)
                    this.Open();
            }
            catch { }


            base.DtrEnable = false;
            base.RtsEnable = false;

            System.Threading.Thread.Sleep(50);

            base.DtrEnable = true;
            base.RtsEnable = true;

            System.Threading.Thread.Sleep(50);

            try
            {
                if (!open)
                    this.Close();
            }
            catch { }
            Console.WriteLine("toggleDTR done " + this.IsOpen);
        }

        /// <summary>
        /// detects STK version 1 or 2
        /// </summary>
        /// <param name="port">comportname</param>
        /// <returns>string either (1280/2560) or "" for none</returns>
        public static string DetectVersion(string port)
        {
            SerialPort serialPort = new SerialPort();
            serialPort.PortName = port;

            if (serialPort.IsOpen)
                serialPort.Close();

            serialPort.DtrEnable = true;
            serialPort.BaudRate = 57600;
            serialPort.Open();

            serialPort.toggleDTR();

            Thread.Sleep(100);

            int a = 0;
            while (a < 20) // 20 * 50 = 1 sec
            {
                //Console.WriteLine("write " + DateTime.Now.Millisecond);
                serialPort.DiscardInBuffer();
                serialPort.Write(new byte[] { (byte)'0', (byte)' ' }, 0, 2);
                a++;
                Thread.Sleep(50);

                //Console.WriteLine("btr {0}", serialPort.BytesToRead);
                if (serialPort.BytesToRead >= 2)
                {
                    byte b1 = (byte)serialPort.ReadByte();
                    byte b2 = (byte)serialPort.ReadByte();
                    if (b1 == 0x14 && b2 == 0x10)
                    {
                        serialPort.Close();
                        log.Info("is a 1280");
                        return "1280";
                    }
                }
            }

            serialPort.Close();

            log.Warn("Not a 1280");

            Thread.Sleep(500);

            serialPort.DtrEnable = true;
            serialPort.BaudRate = 115200;
            serialPort.Open();

            serialPort.toggleDTR();

            Thread.Sleep(100);

            a = 0;
            while (a < 4)
            {
                byte[] temp = new byte[] { 0x6, 0, 0, 0, 0 };
                temp = ArduinoDetect.genstkv2packet(serialPort, temp);
                a++;
                Thread.Sleep(50);

                try
                {
                    if (temp[0] == 6 && temp[1] == 0 && temp.Length == 2)
                    {
                        serialPort.Close();
                        log.Info("is a 2560");
                        return "2560";

                    }
                }
                catch
                {
                }
            }

            serialPort.Close();
            log.Warn("Not a 2560");
            return "";
        }