v0.6: DHCP tunnel transport with NOP heartbeat protocol

Robovoice.App/MainForm.cs

@@ -2,7 +2,7 @@ using NAudio.Wave;
 using Robovoice.App;
 using Robovoice.Core;
 using Robovoice.Core.Voices;
-using Robovoice.Stt.Tcp;
+using Robovoice.Stt.Dhcp;
 using Robovoice.Tts.LibPiper;
 using System.Diagnostics;
 
@@ -16,7 +16,7 @@ internal sealed partial class MainForm : Form
 
     private LibPiperTtsEngine? _tts;
     private AudioOutput? _audioOutput;
-    private TcpSttSource? _sttSource;
+    private DhcpSttSource? _sttSource;
     private Orchestrator? _orchestrator;
     private PttHotkey? _pttHotkey;
     private NotifyIcon? _trayIcon;
@@ -61,7 +61,7 @@ internal sealed partial class MainForm : Form
         OnSliderScroll(null, EventArgs.Empty);
 
         chkMinimizeToTray.Checked = _config.MinimizeToTray;
-        txtServer.Text = _config.ServerEndpoint;
+        PopulateInterfaces();
 
         btnBrowseFile.Click += OnBrowseFile;
         btnTestVoice.Click += OnTestVoice;
@@ -71,8 +71,7 @@ internal sealed partial class MainForm : Form
         txtPttKey.KeyDown += OnPttKeyDown;
         cmbOutput.SelectedIndexChanged += OnOutputChanged;
         cmbVoice.SelectedIndexChanged += OnVoiceChanged;
-        txtServer.Leave += OnServerChanged;
-        btnConnect.Click += OnConnect;
+        cmbInterface.SelectedIndexChanged += OnInterfaceChanged;
 
         trkNoise.Scroll += OnSliderScroll;
         trkSpeed.Scroll += OnSliderScroll;
@@ -245,8 +244,9 @@ internal sealed partial class MainForm : Form
 
         if (_sttSource is null)
         {
-            _sttSource = new TcpSttSource { ServerEndpoint = txtServer.Text, Log = Log };
-            Log($"STT endpoint: {_sttSource.ServerEndpoint} (press Connect)");
+            string ifaceIp = cmbInterface.SelectedItem as string ?? "";
+            _sttSource = new DhcpSttSource { InterfaceIp = ifaceIp, Log = Log };
+            await _sttSource.StartAsync();
         }
 
         _orchestrator?.DisposeAsync().AsTask().Wait();
@@ -425,40 +425,59 @@ internal sealed partial class MainForm : Form
         SaveConfig();
     }
 
-    private void OnServerChanged(object? sender, EventArgs e)
+    private void PopulateInterfaces()
     {
-        if (_sttSource is not null)
+        cmbInterface.Items.Clear();
+        foreach (var (ip, name) in DhcpSttSource.GetAvailableInterfaces())
         {
-            _sttSource.ServerEndpoint = txtServer.Text;
-            Log($"Server endpoint: {txtServer.Text}");
+            cmbInterface.Items.Add(name);
+            cmbInterface.Items[^1] = name;
+            cmbInterface.Items[cmbInterface.Items.Count - 1] = name;
         }
-        SaveConfig();
+
+        if (!string.IsNullOrEmpty(_config.InterfaceIp))
+        {
+            for (int i = 0; i < cmbInterface.Items.Count; i++)
+            {
+                if (cmbInterface.Items[i] is string s && s.Contains(_config.InterfaceIp))
+                {
+                    cmbInterface.SelectedIndex = i;
+                    return;
+                }
+            }
+        }
+
+        if (cmbInterface.Items.Count > 0)
+            cmbInterface.SelectedIndex = 0;
     }
 
-    private async void OnConnect(object? sender, EventArgs e)
+    private void OnInterfaceChanged(object? sender, EventArgs e)
     {
-        if (_sttSource is null)
-        {
-            Log("STT source not initialized.");
+        if (cmbInterface.SelectedItem is not string selected)
             return;
-        }
 
-        _sttSource.ServerEndpoint = txtServer.Text;
+        string? ip = ExtractIpFromDisplay(selected);
+        if (ip is null) return;
+
+        _config.InterfaceIp = ip;
         SaveConfig();
-        btnConnect.Enabled = false;
-        try
+
+        if (_sttSource is not null)
         {
-            if (_sttSource.IsRunning)
-                await _sttSource.ReconnectAsync();
-            else
-                await _sttSource.StartAsync();
-        }
-        finally
-        {
-            btnConnect.Enabled = true;
+            _sttSource.DisposeAsync().AsTask().Wait(2000);
+            _sttSource = null;
+            _ = InitializeEngineAsync();
         }
     }
 
+    private static string? ExtractIpFromDisplay(string display)
+    {
+        int start = display.IndexOf('(');
+        int end = display.IndexOf(')');
+        if (start < 0 || end <= start) return null;
+        return display[(start + 1)..end];
+    }
+
     private void SetupTray()
     {
         if (_trayInit) return;
@@ -524,7 +543,7 @@ internal sealed partial class MainForm : Form
         _config.LengthScale = trkSpeed.Value;
         _config.NoiseWScale = trkNoiseW.Value;
         _config.MinimizeToTray = chkMinimizeToTray.Checked;
-        _config.ServerEndpoint = txtServer.Text;
+        _config.InterfaceIp = ExtractIpFromDisplay(cmbInterface.SelectedItem as string ?? "") ?? "";
         _config.Save();
     }