fix(ui): make rig switching atomic and visible

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

@@ -443,6 +443,7 @@ const signalSplitValueEl = document.getElementById("signal-split-value");
 const overviewPeakHoldEl = document.getElementById("overview-peak-hold");
 const themeToggleBtn = document.getElementById("theme-toggle");
 const headerRigSwitchSelect = document.getElementById("header-rig-switch-select");
+const headerRigSummary = document.getElementById("header-rig-summary");
 const headerStylePickSelect = document.getElementById("header-style-pick-select");
 const rdsPsOverlay = document.getElementById("rds-ps-overlay");
 const tabMainEl = document.getElementById("tab-main");
@@ -902,6 +903,7 @@ async function restorePreviousTuneState() {
 let lastRigIds = [];
 let lastRigDisplayNames = {};
 let lastActiveRigId = null;
+let rigSwitchInProgress = false;
 let lastCityLabel = "";
 let sseSessionId = null;
 const originalTitle = document.title;
@@ -1246,6 +1248,20 @@ function populateRigPicker(selectEl, rigIds, activeRigId, disabled) {
   selectEl.disabled = disabled;
 }
 
+function updateRigIdentitySummary(rigId, pending = false) {
+  if (!headerRigSummary) return;
+  const rig = serverRigs.find((entry) => entry?.remote === rigId);
+  if (!rig) {
+    headerRigSummary.textContent = pending ? "Switching rigs…" : "No rig details available";
+    return;
+  }
+  const hardware = [rig.manufacturer, rig.model].map(value => String(value || "").trim()).filter(Boolean).join(" ") || rig.remote;
+  const modes = Array.isArray(rig.supported_modes) ? rig.supported_modes.map(normalizeMode).filter(Boolean) : [];
+  const features = [rig.tx ? "TX" : "RX", rig.filter_controls ? "SDR filters" : null, ...modes.slice(0, 5)];
+  if (modes.length > 5) features.push(`+${modes.length - 5} modes`);
+  headerRigSummary.textContent = `${pending ? "Switching to " : ""}${hardware} · ${features.filter(Boolean).join(" · ")}`;
+}
+
 function updateRigSubtitle(activeRigId) {
   if (!rigSubtitle) return;
   const name = (activeRigId && lastRigDisplayNames[activeRigId]) || activeRigId || "--";
@@ -1282,6 +1298,7 @@ function applyRigList(activeRigId, rigIds, displayNames) {
   const disableSwitch = lastRigIds.length === 0 || !authRole || authRole === "rx";
   populateRigPicker(headerRigSwitchSelect, lastRigIds, lastActiveRigId, disableSwitch);
   updateRigSubtitle(lastActiveRigId);
+  updateRigIdentitySummary(lastActiveRigId);
   window.trxUi?.setActiveRig(lastActiveRigId);
   if (rigListChanged) {
     if (typeof setSchedulerRig === "function") setSchedulerRig(lastActiveRigId);
@@ -3881,12 +3898,16 @@ function scheduleUiFrameJob(key, job) {
 
 window.trxScheduleUiFrameJob = scheduleUiFrameJob;
 
-async function postPath(path) {
+async function postPath(path, options = {}) {
+  if (rigSwitchInProgress && !options.allowDuringRigSwitch) {
+    throw new Error("Wait for the rig switch to finish");
+  }
+  const targetRigId = options.remote === undefined ? lastActiveRigId : options.remote;
   // Auto-append remote so each tab targets its own rig.
   // Skip when the caller already included remote (e.g. /select_rig).
-  if (lastActiveRigId && !path.includes("remote=")) {
+  if (targetRigId && !path.includes("remote=")) {
     const sep = path.includes("?") ? "&" : "?";
-    path = `${path}${sep}remote=${encodeURIComponent(lastActiveRigId)}`;
+    path = `${path}${sep}remote=${encodeURIComponent(targetRigId)}`;
   }
   const resp = await fetch(path, { method: "POST" });
   if (authEnabled && resp.status === 401) {
@@ -3931,36 +3952,45 @@ async function switchRigFromSelect(selectEl) {
     return;
   }
   const prevRig = lastActiveRigId;
-  lastActiveRigId = selectEl.value;
+  const nextRig = selectEl.value;
-  if (prevRig && prevRig !== lastActiveRigId) {
+  if (nextRig === prevRig || rigSwitchInProgress) return;
-    resetDecoderStateOnRigSwitch();
+  rigSwitchInProgress = true;
-  }
+  setControlPending(selectEl, true);
-  updateRigSubtitle(lastActiveRigId);
+  selectEl.closest(".header-rig-switch")?.classList.add("is-switching");
-  if (typeof setSchedulerRig === "function") setSchedulerRig(lastActiveRigId);
+  updateRigIdentitySummary(nextRig, true);
-  if (typeof setBackgroundDecodeRig === "function") setBackgroundDecodeRig(lastActiveRigId);
+  showHint(`Switching to ${lastRigDisplayNames[nextRig] || nextRig}…`);
-  if (typeof bmFetch === "function") bmFetch(document.getElementById("bm-category-filter")?.value || "");
-  window.trx.modules.map?.syncAprsReceiverMarker();
-  // Switch this session's rig and reconnect SSE to the new rig's
-  // state channel.
   try {
     const sidParam = sseSessionId ? `&session_id=${encodeURIComponent(sseSessionId)}` : "";
-    await postPath(`/select_rig?remote=${encodeURIComponent(selectEl.value)}${sidParam}`);
+    await postPath(`/select_rig?remote=${encodeURIComponent(nextRig)}${sidParam}`, { allowDuringRigSwitch: true, remote: null });
+    lastActiveRigId = nextRig;
+    resetDecoderStateOnRigSwitch();
+    updateRigSubtitle(lastActiveRigId);
+    updateRigIdentitySummary(lastActiveRigId);
+    window.trxUi?.setActiveRig(lastActiveRigId);
+    if (typeof setSchedulerRig === "function") setSchedulerRig(lastActiveRigId);
+    if (typeof setBackgroundDecodeRig === "function") setBackgroundDecodeRig(lastActiveRigId);
+    if (typeof bmFetch === "function") bmFetch(document.getElementById("bm-category-filter")?.value || "");
+    window.trx.modules.map?.syncAprsReceiverMarker();
     connect();
+    stopSpectrumStreaming();
+    startSpectrumStreaming();
+    stopMeterStreaming();
+    startMeterStreaming();
+    if (rxActive) {
+      stopRxAudio();
+      startRxAudio();
+    }
+    showHint(`Rig: ${lastRigDisplayNames[lastActiveRigId] || lastActiveRigId}`, 1500);
   } catch (err) {
     console.error("select_rig failed:", err);
+    selectEl.value = prevRig || "";
+    updateRigIdentitySummary(prevRig);
+    window.trxUi?.notify("Rig could not be switched", { kind: "error" });
+  } finally {
+    rigSwitchInProgress = false;
+    setControlPending(selectEl, false);
+    selectEl.closest(".header-rig-switch")?.classList.remove("is-switching");
   }
-  // Reconnect spectrum SSE to the new rig's spectrum channel.
-  stopSpectrumStreaming();
-  startSpectrumStreaming();
-  // Reconnect meter SSE to the new rig's meter channel.
-  stopMeterStreaming();
-  startMeterStreaming();
-  // Reconnect audio to the new rig if audio is active.
-  if (rxActive) {
-    stopRxAudio();
-    startRxAudio();
-  }
-  showHint(`Rig: ${lastActiveRigId}`, 1500);
 }
 
 if (headerRigSwitchSelect) {

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

@@ -85,6 +85,7 @@ SPDX-License-Identifier: GPL-2.0-or-later
         <button id="header-rec-btn" class="header-bar-btn header-rec-btn" type="button" aria-label="Toggle recording" title="Toggle recording">REC</button>
         <div class="header-rig-switch">
           <select id="header-rig-switch-select" aria-label="Select active rig"></select>
+          <span id="header-rig-summary" class="header-rig-summary" aria-live="polite"></span>
         </div>
         <div class="header-style-pick">
           <select id="header-style-pick-select" aria-label="Select UI style">

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

@@ -1407,6 +1407,33 @@ small { color: var(--text-muted); }
   display: flex;
   align-items: center;
   gap: 0.35rem;
+  position: relative;
+}
+.header-rig-summary {
+  position: absolute;
+  top: calc(100% + 0.3rem);
+  left: 0;
+  z-index: 20;
+  width: max-content;
+  max-width: min(28rem, calc(100vw - 2rem));
+  padding: 0.25rem 0.45rem;
+  border: 1px solid color-mix(in srgb, var(--border-light) 75%, transparent);
+  border-radius: var(--radius-sm);
+  background: color-mix(in srgb, var(--card-bg) 96%, transparent);
+  color: var(--text-muted);
+  box-shadow: 0 7px 20px color-mix(in srgb, #000 24%, transparent);
+  font-size: var(--fs-xs);
+  line-height: 1.35;
+  opacity: 0;
+  visibility: hidden;
+  pointer-events: none;
+  transition: opacity var(--dur-fast) var(--ease-out), visibility var(--dur-fast);
+}
+.header-rig-switch:hover .header-rig-summary,
+.header-rig-switch:focus-within .header-rig-summary,
+.header-rig-switch.is-switching .header-rig-summary {
+  opacity: 1;
+  visibility: visible;
 }
 .header-rig-switch select {
   min-width: 8rem;

src/trx-client/trx-frontend/trx-frontend-http/src/api/rig.rs

@@ -389,6 +389,8 @@ struct RigListItem {
     manufacturer: String,
     model: String,
     supported_modes: Vec<trx_core::RigMode>,
+    tx: bool,
+    filter_controls: bool,
     initialized: bool,
     #[serde(skip_serializing_if = "Option::is_none")]
     latitude: Option<f64>,
@@ -424,6 +426,8 @@ fn map_rig_entry(entry: &RemoteRigEntry) -> RigListItem {
         manufacturer: entry.state.info.manufacturer.clone(),
         model: entry.state.info.model.clone(),
         supported_modes: entry.state.info.capabilities.supported_modes.clone(),
+        tx: entry.state.info.capabilities.tx,
+        filter_controls: entry.state.info.capabilities.filter_controls,
         initialized: entry.state.initialized,
         latitude: entry.state.server_latitude,
         longitude: entry.state.server_longitude,