Add Send/Recv gauges, fix tick loop to consume without BLE

- Four gauges: Send A/B (commanded) and Recv A/B (device-reported)
- State.LastSentA/B tracks what would be sent after limiting
- ConsumeTick always runs; only SendB0 gated on IsConnected
- Stream queues drain correctly in dev mode (no box)
- Tray icon hot state works without BLE connected
- Removed strength text label, widened form to 420x360

MainForm.cs

@@ -14,7 +14,6 @@ public class MainForm : Form
     readonly NotifyIcon       _tray;
     readonly Label            _lblBle;
     readonly Label            _lblWs;
-    readonly Label            _lblStrength;
     readonly Label            _lblDeviceName;
     readonly TextBox          _txtDeviceName;
     readonly Button           _btnConnect;
@@ -25,10 +24,14 @@ public class MainForm : Form
 
     bool _closingFromTray;
 
-    readonly ProgressBar _gaugeA;
+    readonly ProgressBar _gaugeSendA;
-    readonly ProgressBar _gaugeB;
+    readonly ProgressBar _gaugeSendB;
-    readonly Label _lblGaugeA;
+    readonly ProgressBar _gaugeRecvA;
-    readonly Label _lblGaugeB;
+    readonly ProgressBar _gaugeRecvB;
+    readonly Label _lblSendA;
+    readonly Label _lblSendB;
+    readonly Label _lblRecvA;
+    readonly Label _lblRecvB;
     readonly TrackBar _limitBar;
     readonly Label _lblLimit;
     readonly CheckBox _chkScale;
@@ -52,7 +55,7 @@ public class MainForm : Form
         _loopCts = new CancellationTokenSource();
 
         Text = "Substation";
-        ClientSize = new Size(360, 340);
+        ClientSize = new Size(420, 360);
         FormBorderStyle = FormBorderStyle.FixedSingle;
         MaximizeBox = false;
         StartPosition = FormStartPosition.CenterScreen;
@@ -62,7 +65,7 @@ public class MainForm : Form
         {
             Text = "BLE: searching...",
             Location = new Point(16, 16),
-            Size = new Size(328, 20),
+            Size = new Size(388, 20),
             Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
         };
 
@@ -70,34 +73,27 @@ public class MainForm : Form
         {
             Text = "WS: idle",
             Location = new Point(16, 40),
-            Size = new Size(328, 20),
+            Size = new Size(388, 20),
             Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
         };
 
-        _lblStrength = new Label
-        {
-            Text = "Strength: A=0 B=0",
-            Location = new Point(16, 64),
-            Size = new Size(328, 20)
-        };
-
         _lblDeviceName = new Label
         {
             Text = "Device:",
-            Location = new Point(16, 90),
+            Location = new Point(16, 66),
             Size = new Size(48, 20)
         };
         _txtDeviceName = new TextBox
         {
             Text = "47L121000",
-            Location = new Point(68, 88),
+            Location = new Point(68, 64),
             Size = new Size(160, 20)
         };
 
         _btnConnect = new Button
         {
             Text = "Connect",
-            Location = new Point(236, 88),
+            Location = new Point(296, 64),
             Size = new Size(108, 24)
         };
         _btnConnect.Click += OnConnect;
@@ -105,7 +101,7 @@ public class MainForm : Form
         _btnTest = new Button
         {
             Text = "Test",
-            Location = new Point(16, 120),
+            Location = new Point(16, 96),
             Size = new Size(100, 32)
         };
         _btnTest.Click += OnTest;
@@ -113,7 +109,7 @@ public class MainForm : Form
         _btnMusic = new Button
         {
             Text = "Music",
-            Location = new Point(130, 120),
+            Location = new Point(130, 96),
             Size = new Size(100, 32)
         };
         _btnMusic.Click += OnMusic;
@@ -121,7 +117,7 @@ public class MainForm : Form
         _btnStop = new Button
         {
             Text = "Stop All",
-            Location = new Point(244, 120),
+            Location = new Point(244, 96),
             Size = new Size(100, 32)
         };
         _btnStop.Click += OnStop;
@@ -129,37 +125,67 @@ public class MainForm : Form
         _lblTrack = new Label
         {
             Text = "",
-            Location = new Point(16, 158),
+            Location = new Point(16, 134),
-            Size = new Size(328, 16),
+            Size = new Size(388, 16),
             ForeColor = Color.DimGray
         };
 
-        _lblGaugeA = new Label
+        _lblSendA = new Label
         {
-            Text = "A",
+            Text = "Send A",
-            Location = new Point(16, 180),
+            Location = new Point(16, 160),
-            Size = new Size(16, 20),
+            Size = new Size(48, 20),
             Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
         };
-        _gaugeA = new ProgressBar
+        _gaugeSendA = new ProgressBar
         {
-            Location = new Point(40, 180),
+            Location = new Point(72, 160),
-            Size = new Size(304, 20),
+            Size = new Size(332, 20),
             Minimum = 0,
             Maximum = 200,
             Style = ProgressBarStyle.Continuous
         };
-        _lblGaugeB = new Label
+        _lblSendB = new Label
         {
-            Text = "B",
+            Text = "Send B",
-            Location = new Point(16, 208),
+            Location = new Point(16, 184),
-            Size = new Size(16, 20),
+            Size = new Size(48, 20),
             Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
         };
-        _gaugeB = new ProgressBar
+        _gaugeSendB = new ProgressBar
         {
-            Location = new Point(40, 208),
+            Location = new Point(72, 184),
-            Size = new Size(304, 20),
+            Size = new Size(332, 20),
+            Minimum = 0,
+            Maximum = 200,
+            Style = ProgressBarStyle.Continuous
+        };
+        _lblRecvA = new Label
+        {
+            Text = "Recv A",
+            Location = new Point(16, 212),
+            Size = new Size(48, 20),
+            Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
+        };
+        _gaugeRecvA = new ProgressBar
+        {
+            Location = new Point(72, 212),
+            Size = new Size(332, 20),
+            Minimum = 0,
+            Maximum = 200,
+            Style = ProgressBarStyle.Continuous
+        };
+        _lblRecvB = new Label
+        {
+            Text = "Recv B",
+            Location = new Point(16, 236),
+            Size = new Size(48, 20),
+            Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
+        };
+        _gaugeRecvB = new ProgressBar
+        {
+            Location = new Point(72, 236),
+            Size = new Size(332, 20),
             Minimum = 0,
             Maximum = 200,
             Style = ProgressBarStyle.Continuous
@@ -168,14 +194,14 @@ public class MainForm : Form
         _lblLimit = new Label
         {
             Text = "Limit: 30",
-            Location = new Point(16, 248),
+            Location = new Point(16, 272),
             Size = new Size(64, 20),
             Font = new Font(Font.FontFamily, 9, FontStyle.Bold)
         };
         _limitBar = new TrackBar
         {
-            Location = new Point(80, 244),
+            Location = new Point(80, 268),
-            Size = new Size(180, 45),
+            Size = new Size(240, 45),
             Minimum = 0,
             Maximum = 200,
             TickFrequency = 50,
@@ -185,14 +211,14 @@ public class MainForm : Form
         _chkScale = new CheckBox
         {
             Text = "Scale",
-            Location = new Point(268, 248),
+            Location = new Point(328, 272),
             Size = new Size(76, 24),
             Checked = false
         };
         _chkScale.CheckedChanged += OnLimitChanged;
         OnLimitChanged(null, EventArgs.Empty);
 
-        Controls.AddRange(new Control[] { _lblBle, _lblWs, _lblStrength, _lblDeviceName, _txtDeviceName, _btnConnect, _btnTest, _btnMusic, _btnStop, _lblTrack, _lblGaugeA, _gaugeA, _lblGaugeB, _gaugeB, _lblLimit, _limitBar, _chkScale });
+        Controls.AddRange(new Control[] { _lblBle, _lblWs, _lblDeviceName, _txtDeviceName, _btnConnect, _btnTest, _btnMusic, _btnStop, _lblTrack, _lblSendA, _gaugeSendA, _lblSendB, _gaugeSendB, _lblRecvA, _gaugeRecvA, _lblRecvB, _gaugeRecvB, _lblLimit, _limitBar, _chkScale });
 
         // Tray icon — three cached variants: neutral=gray, active=gold, hot=red-orange
         _iconNeutral = CreateVoltageIcon(Color.Gray);
@@ -242,9 +268,9 @@ public class MainForm : Form
         {
             try
             {
+                var (modeA, valA, modeB, valB, freqA, intA, freqB, intB) = _state.ConsumeTick();
                 if (_device.IsConnected)
                 {
-                    var (modeA, valA, modeB, valB, freqA, intA, freqB, intB) = _state.ConsumeTick();
                     var frame = B0.Build(0, modeA, modeB, valA, valB, freqA, intA, freqB, intB);
                     await _device.SendB0(frame);
                 }
@@ -331,9 +357,10 @@ public class MainForm : Form
         _lblBle.Text = _device.IsConnected
             ? $"BLE: connected ({_device.DeviceName})"
             : "BLE: disconnected";
-        _lblStrength.Text = $"Strength: A={_device.StrengthA} B={_device.StrengthB}";
+        _gaugeSendA.Value = Math.Clamp(_state.LastSentA, 0, 200);
-        _gaugeA.Value = Math.Clamp(_device.StrengthA, 0, 200);
+        _gaugeSendB.Value = Math.Clamp(_state.LastSentB, 0, 200);
-        _gaugeB.Value = Math.Clamp(_device.StrengthB, 0, 200);
+        _gaugeRecvA.Value = Math.Clamp(_device.StrengthA, 0, 200);
+        _gaugeRecvB.Value = Math.Clamp(_device.StrengthB, 0, 200);
         _btnTest.Enabled = !_server.HasClient && !IsTestRunning;
         _btnMusic.Enabled = !_server.HasClient && !_isMusicRunning;
         _btnStop.Enabled = true;

State.cs

@@ -16,6 +16,7 @@ public class State
     public readonly ConcurrentQueue<WaveFrame> StreamB = new();
 
     public int ActualA, ActualB;
+    public int LastSentA, LastSentB;
 
     public int MaxStrength = 200;
     public LimitMode LimitMode = LimitMode.Clamp;
@@ -99,6 +100,8 @@ public class State
                     : (byte)Math.Clamp(desired, 0, limit);
             var valA  = ApplyLimit(DesiredA);
             var valB  = ApplyLimit(DesiredB);
+            LastSentA = valA;
+            LastSentB = valB;
             DirtyA = false;
             DirtyB = false;