Aggiungere i file di progetto.

OMControl/Serial/SerialPortWatcher.cs

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+using System;
+using System.Collections.Generic;
+using System.IO.Ports;
+using System.Linq;
+using System.Timers;
+
+public sealed class SerialPortWatcher : IDisposable
+{
+    private readonly System.Timers.Timer _timer;
+    private HashSet<string> _last = new(StringComparer.OrdinalIgnoreCase);
+
+    public event Action<string[]>? PortsAdded;
+    public event Action<string[]>? PortsRemoved;
+
+    public SerialPortWatcher(double intervalMs = 1000)
+    {
+        _timer = new System.Timers.Timer(intervalMs);
+        _timer.Elapsed += (_, _) => Tick();
+        _timer.AutoReset = true;
+    }
+
+    public void Start()
+    {
+        _last = GetPorts();
+        _timer.Start();
+    }
+
+    public void Stop() => _timer.Stop();
+
+    private void Tick()
+    {
+        var current = GetPorts();
+
+        var added = current.Except(_last).ToArray();
+        var removed = _last.Except(current).ToArray();
+
+        if (added.Length > 0) PortsAdded?.Invoke(added);
+        if (removed.Length > 0) PortsRemoved?.Invoke(removed);
+
+        _last = current;
+    }
+
+    private static HashSet<string> GetPorts()
+        => new HashSet<string>(SerialPort.GetPortNames(), StringComparer.OrdinalIgnoreCase);
+
+    public void Dispose()
+    {
+        _timer.Stop();
+        _timer.Dispose();
+    }
+}
+