USB HID Device (PC側)

using System;
using System.Linq;
using System.Windows.Forms;

//https://csharpdoc.hotexamples.com/class/HidLibrary/HidDevice

namespace TestHID
{
        public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        const int VendorId = 0x483;     // STMicroelectronics
        const int ProductId = 0x5750;  //   
        HidLibrary.HidDevice _device;

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Interval = 500;
            timer1.Start();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            TryDeviceConnect();
        }

        void TryDeviceConnect()
        {
            _device = HidLibrary.HidDevices.Enumerate(VendorId, ProductId).FirstOrDefault();

            if (_device != null)
            {
                _device.Inserted += () => Invoke((MethodInvoker)(()=> 
                {
                    groupBox1.Enabled = true; 
                }));

                _device.Removed += () => Invoke((MethodInvoker)(() =>
                {
                    groupBox1.Enabled = false;
                    timer1.Start();
                }));

                _device.MonitorDeviceEvents = true;
                                _device.ReadReport(OnReport);
                _device.OpenDevice();
                panel1.Enabled = true;
                timer1.Stop();
            }
                }

                void OnReport(HidLibrary.HidReport report)
                {
                        this.Invoke((MethodInvoker)(() =>
                        {
                                textBox1.Text = Convert.ToString(BitConverter.ToString(report.Data));
                        }));
                        if (_device != null)
                                _device.ReadReport(OnReport);
                }

        private void radioButton_CheckedChanged(object sender, EventArgs e)
        {
            if (!((RadioButton)sender).Checked) return;  // prevent to be called twice
            HidLibrary.HidReport rep;
            rep = new HidLibrary.HidReport(65);
            int i;
            if (radioButton1.Checked)
            {
                for (i = 0; i < rep.Data.Length; i++)
                    rep.Data[i] = (byte)i;
            }
            else
            {
                for (i = 0; i < rep.Data.Length; i++)
                    rep.Data[i] = (byte)(rep.Data.Length - i);
            }
                        _device.WriteReport(rep);
        }
        }
}