[debug](trx-backend-soapysdr,trx-frontend-http): add RDS diagnostics

Add server-side debug log when RDS data is decoded (PI, PS, PTY).
Extend the RDS panel with active mode, frame counter, and a raw JSON
dump of the last spectrum frame (bins excluded) to help diagnose why
RDS remains absent from the SSE stream.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>

src/trx-client/trx-frontend/trx-frontend-http/assets/web/app.js

@@ -350,6 +350,7 @@ function syncTopBarAccess() {
 
 let overviewDrawPending = false;
 let lastSpectrumData = null;
+let rdsFrameCount = 0;
 let lastControl;
 let lastTxEn = null;
 let lastHasTx = true;
@@ -3099,6 +3100,7 @@ function startSpectrumStreaming() {
     }
     try {
       lastSpectrumData = JSON.parse(evt.data);
+      rdsFrameCount++;
       pushOverviewWaterfallFrame(lastSpectrumData);
       refreshCenterFreqDisplay();
       scheduleSpectrumDraw();
@@ -3125,6 +3127,7 @@ function stopSpectrumStreaming() {
   }
   spectrumDrawPending = false;
   lastSpectrumData = null;
+  rdsFrameCount = 0;
   overviewWaterfallRows = [];
   overviewWaterfallPushCount = 0;
   _wfResetOffscreen();
@@ -3155,6 +3158,7 @@ function updateRdsPsOverlay(rds) {
 
   // RDS debug panel
   const statusEl   = document.getElementById("rds-status");
+  const modeEl     = document.getElementById("rds-mode");
   const piEl       = document.getElementById("rds-pi");
   const psEl       = document.getElementById("rds-ps");
   const ptyEl      = document.getElementById("rds-pty");
@@ -3162,6 +3166,11 @@ function updateRdsPsOverlay(rds) {
   const rawEl      = document.getElementById("rds-raw");
   if (!statusEl) return;
 
+  // Always show the current mode, frame counter, and a sanitised spectrum snapshot
+  if (modeEl) modeEl.textContent = document.getElementById("mode")?.value || "--";
+  const framesEl = document.getElementById("rds-frames");
+  if (framesEl) framesEl.textContent = String(rdsFrameCount);
+
   if (!rds) {
     statusEl.textContent = "No signal";
     statusEl.className = "rds-value rds-no-signal";
@@ -3169,7 +3178,10 @@ function updateRdsPsOverlay(rds) {
     psEl.textContent = "--";
     ptyEl.textContent = "--";
     ptyNameEl.textContent = "--";
-    rawEl.textContent = "--";
+    if (rawEl && lastSpectrumData) {
+      const { bins: _b, ...rest } = lastSpectrumData;
+      rawEl.textContent = JSON.stringify(rest, null, 2);
+    }
     return;
   }
 
@@ -3344,7 +3356,7 @@ function drawSpectrum(data) {
   ctx.stroke();
   ctx.restore();
 
-  // Peak markers for easier snap-tune targeting.
+  // ── Peak markers for easier snap-tune targeting ──────────────────────────
   const markerPeaks = visibleSpectrumPeakIndices(data);
   if (markerPeaks.length > 0) {
     ctx.save();

src/trx-client/trx-frontend/trx-frontend-http/assets/web/index.html

@@ -274,12 +274,14 @@
       <div id="subtab-rds" class="sub-tab-panel" style="display:none;">
         <div class="rds-grid">
           <div class="rds-field"><span class="rds-label">Status</span><span id="rds-status" class="rds-value rds-no-signal">No signal</span></div>
+          <div class="rds-field"><span class="rds-label">Active mode</span><span id="rds-mode" class="rds-value">--</span></div>
+          <div class="rds-field"><span class="rds-label">Frames received</span><span id="rds-frames" class="rds-value">0</span></div>
           <div class="rds-field"><span class="rds-label">PI</span><span id="rds-pi" class="rds-value">--</span></div>
           <div class="rds-field"><span class="rds-label">PS</span><span id="rds-ps" class="rds-value rds-ps">--</span></div>
           <div class="rds-field"><span class="rds-label">PTY</span><span id="rds-pty" class="rds-value">--</span></div>
           <div class="rds-field"><span class="rds-label">PTY Name</span><span id="rds-pty-name" class="rds-value">--</span></div>
         </div>
-        <div class="rds-raw-label">Raw JSON</div>
+        <div class="rds-raw-label">Raw JSON (last spectrum frame)</div>
         <pre id="rds-raw" class="rds-raw">--</pre>
       </div>
       <div id="subtab-map" class="sub-tab-panel" style="display:none;">

src/trx-client/trx-frontend/trx-frontend-http/assets/web/style.css

@@ -123,6 +123,11 @@ body {
 input.status-input, select.status-input { width: 100%; padding: 0.45rem 0.5rem; font-size: 1rem; border: 1px solid var(--border-light); border-radius: 6px; background: var(--input-bg); color: var(--text); }
 #mode { height: var(--control-height); }
 #freq { font-family: 'DSEG14 Classic', monospace; font-size: 2rem; padding: 0.5rem 0.6rem; letter-spacing: 0.05em; text-align: center; }
+#freq:disabled,
+#center-freq:disabled {
+  opacity: 1;
+  -webkit-text-fill-color: currentColor;
+}
 #center-freq { color: var(--wavelength-fg); }
 .controls-row {
   display: grid;

src/trx-server/trx-backend/trx-backend-soapysdr/src/lib.rs

@@ -460,6 +460,9 @@ impl RigCat for SoapySdrRig {
             .channel_dsps
             .get(self.primary_channel_idx)
             .and_then(|dsp| dsp.lock().ok().and_then(|d| d.rds_data()));
+        if let Some(ref r) = rds {
+            tracing::debug!("RDS: pi={:?} ps={:?} pty={:?}({})", r.pi, r.program_service, r.pty, r.pty_name.as_deref().unwrap_or("?"));
+        }
         Some(SpectrumData {
             bins,
             center_hz: self.center_hz.max(0) as u64,