Printer/MarlinConnector.cs

using System.IO.Ports;
using System.Threading.Tasks;

namespace FastPrint.Printer
{
    public class MarlinConnector
    {
        private SerialPort port;

        public MarlinConnector(string portName, int baudRate = 115200)
        {
            port = new SerialPort(portName, baudRate);
        }

        public async Task ConnectAsync()
        {
            if (!port.IsOpen)
                port.Open();
            await SendCommandAsync("M115"); // Get firmware info
        }

        public async Task SendCommandAsync(string gcode)
        {
            if (port.IsOpen)
                await port.BaseStream.WriteAsync(System.Text.Encoding.ASCII.GetBytes(gcode + "\n"));
        }

        public void Disconnect()
        {
            if (port.IsOpen)
                port.Close();
        }
    }
}