using System;
using System.Diagnostics.Metrics;
using System.IO.Ports;
using System.Timers;

class Program
{
    static SerialPort? serialPort;

    static void Main()
    {
        string[] ports = SerialPort.GetPortNames();

        serialPort = new SerialPort("COM3", 115200, Parity.None, 8, StopBits.One);
        serialPort.Handshake = Handshake.None;
        serialPort.Open();

        byte[] dataToSend = new byte[44]; // 送信データ（ゼロ埋め）

        System.Timers.Timer sendTimer = new System.Timers.Timer(40); // 40ms周期
        sendTimer.Elapsed += (sender, e) => SendData(dataToSend);
        sendTimer.AutoReset = true;
        sendTimer.Start();

        Console.WriteLine("送信中。Enterキーで終了します...");
        Console.ReadLine();

        sendTimer.Stop();
        serialPort.Close();
    }

    static void SendData(byte[] data)
    {
        if (serialPort != null && serialPort.IsOpen)
        {
            serialPort.Write(data, 0, data.Length);
            Console.WriteLine($"送信: {DateTime.Now:HH:mm:ss.fff}");

        }
    }
}