feat: Super Check Partial + N+1 helper; fix Flex binding to SmartSDR CAT; telemetry callsign wait

- SCP/N+1: new internal/scp downloads the community MASTER.SCP master list and a
  docked two-column widget shows, as you type a call, the known calls containing it
  (Partial) and the calls one edit away (N+1) — click to fix a busted call. Opt-in
  in Settings → General; top-bar toggle; queried debounced on callsign input.
- Flex: OpsLog's GUI-client detection was too loose and could bind to "SmartSDR CAT"
  (or DAX) — both carry "smartsdr" in the program name — instead of the real GUI
  client, making SmartSDR CAT drop and reconnect in a loop while OpsLog was open.
  Now it binds only to a real SmartSDR/Maestro GUI client (e.g. a FLEX-8600M's
  integrated screen) and excludes cat/dax; dropped the risky empty-program fallback.
- Telemetry: on a fresh install the callsign isn't set at launch, so the once-a-day
  heartbeat recorded the machine UUID. Now it waits (~10 min) for the operator to
  enter their callsign before sending, falling back to the UUID only if none appears.

app.go

@@ -53,6 +53,7 @@ import (
 	"hamlog/internal/rotator/gs232"
 	"hamlog/internal/rotator/pst"
 	"hamlog/internal/rotgenius"
+	"hamlog/internal/scp"
 	"hamlog/internal/settings"
 	"hamlog/internal/solar"
 	"hamlog/internal/spe"
@@ -234,6 +235,8 @@ const (
 
 	keyClusterAutoConnect = "cluster.auto_connect" // open every enabled server at app start
 
+	keyScpEnabled = "scp.enabled" // Super Check Partial / N+1 suggestions on
+
 	keyBackupEnabled  = "backup.enabled"
 	keyBackupFolder   = "backup.folder"
 	keyBackupRotation = "backup.rotation"
@@ -493,6 +496,7 @@ type App struct {
 	qsoRec         *audio.Recorder    // continuous QSO recorder (rolling pre-roll)
 	solar          *solar.Manager     // live space-weather (SFI/SSN/A/K) for the header + QSO stamping
 	lotwUsers      *lotwusers.Manager // LoTW user-activity list (badge next to the callsign)
+	scp            *scp.Manager       // Super Check Partial / N+1 callsign master list
 
 	// NET Control: persistent net definitions/rosters (global JSON) + the live
 	// session (in-memory only — active stations currently in QSO).
@@ -985,6 +989,25 @@ func (a *App) startup(ctx context.Context) {
 			}
 		}
 	}()
+
+	// Super Check Partial / N+1: load the cached MASTER.SCP; when the feature is
+	// enabled, auto-(re)download it if missing or older than a week.
+	a.scp = scp.NewManager(dataDir)
+	go func() {
+		if v, _ := a.settings.Get(a.ctx, keyScpEnabled); v != "1" {
+			return
+		}
+		if a.scp.Count() == 0 || time.Since(a.scp.Updated()) > 7*24*time.Hour {
+			if n, err := a.scp.Download(context.Background()); err == nil {
+				applog.Printf("scp: auto-downloaded %d callsigns", n)
+				if a.ctx != nil {
+					wruntime.EventsEmit(a.ctx, "scp:updated")
+				}
+			} else {
+				applog.Printf("scp: auto-download failed: %v", err)
+			}
+		}
+	}()
 	go func() {
 		_ = a.clublog.EnsureLoaded()
 		// Auto-refresh a missing/stale country file (ClubLog adds date-ranged
@@ -2311,6 +2334,76 @@ func (a *App) DownloadLoTWUsers() (int, error) {
 	return a.lotwUsers.Download(a.ctx)
 }
 
+// ── Super Check Partial / N+1 ────────────────────────────────────────────────
+
+// ScpStatus is the loaded-list summary for Settings + the widget gate.
+type ScpStatus struct {
+	Enabled bool   `json:"enabled"`
+	Count   int    `json:"count"`
+	Updated string `json:"updated,omitempty"` // RFC3339, empty if never
+}
+
+// GetScpStatus returns whether SCP is enabled and how many calls are loaded.
+func (a *App) GetScpStatus() ScpStatus {
+	st := ScpStatus{}
+	if a.settings != nil {
+		v, _ := a.settings.Get(a.ctx, keyScpEnabled)
+		st.Enabled = v == "1"
+	}
+	if a.scp != nil {
+		st.Count = a.scp.Count()
+		if u := a.scp.Updated(); !u.IsZero() {
+			st.Updated = u.UTC().Format(time.RFC3339)
+		}
+	}
+	return st
+}
+
+// SetScpEnabled turns Super Check Partial on/off. Enabling triggers a background
+// download when the list is missing or stale.
+func (a *App) SetScpEnabled(on bool) error {
+	if a.settings == nil {
+		return fmt.Errorf("db not initialized")
+	}
+	if err := a.settings.Set(a.ctx, keyScpEnabled, boolStr(on)); err != nil {
+		return err
+	}
+	if on && a.scp != nil && (a.scp.Count() == 0 || time.Since(a.scp.Updated()) > 7*24*time.Hour) {
+		go func() {
+			if n, err := a.scp.Download(context.Background()); err == nil {
+				applog.Printf("scp: downloaded %d callsigns", n)
+				if a.ctx != nil {
+					wruntime.EventsEmit(a.ctx, "scp:updated")
+				}
+			} else {
+				applog.Printf("scp: download failed: %v", err)
+			}
+		}()
+	}
+	return nil
+}
+
+// DownloadScp fetches the MASTER.SCP master file and caches it. Returns the
+// number of callsigns loaded.
+func (a *App) DownloadScp() (int, error) {
+	if a.scp == nil {
+		return 0, fmt.Errorf("not initialized")
+	}
+	return a.scp.Download(a.ctx)
+}
+
+// ScpLookup returns the Super Check Partial (substring) and N+1 (one-edit)
+// suggestions for a typed fragment. Empty when SCP is disabled.
+func (a *App) ScpLookup(fragment string) scp.Result {
+	if a.scp == nil || a.settings == nil {
+		return scp.Result{}
+	}
+	if v, _ := a.settings.Get(a.ctx, keyScpEnabled); v != "1" {
+		return scp.Result{}
+	}
+	return a.scp.Lookup(fragment, 60)
+}
+
 // StationInfoComputed bundles the data we resolve live from the
 // profile's callsign + grid: country, ARRL DXCC#, CQ zone, ITU zone,
 // lat/lon. Used by the Settings UI to show the "what will be stamped on

changelog.json

@@ -3,9 +3,13 @@
     "version": "0.21.2",
     "date": "2026-07-25",
     "en": [
+      "Fixed OpsLog disrupting another Flex client: it could bind to 'SmartSDR CAT' (or DAX) instead of the real GUI client, which made SmartSDR CAT keep disconnecting/reconnecting from the radio while OpsLog was open. OpsLog now only binds to the actual SmartSDR/Maestro GUI client (e.g. a FlexRadio 'M' integrated screen).",
+      "New: Super Check Partial + N+1 callsign helper (like N1MM/DXLog). Enable it in Settings → General to download the community MASTER.SCP list; a docked two-column widget then shows, as you type a call, the known calls that contain it (Partial) and the calls one character away (N+1) — click one to fix a busted call.",
       "When a callsign isn't found on QRZ/HamQTH (or you don't use a lookup service), the name, QTH, locator and address are recovered from the last time you worked that station — and the precise locator from that QSO is used instead of the coarse cty.dat country centroid. A real QRZ/HamQTH hit still wins."
     ],
     "fr": [
+      "Correction : OpsLog pouvait perturber un autre client Flex — il pouvait se « binder » sur « SmartSDR CAT » (ou DAX) au lieu du vrai client GUI, ce qui faisait décrocher/reconnecter SmartSDR CAT de la radio en boucle tant qu'OpsLog était ouvert. OpsLog ne se binde désormais qu'au vrai client GUI SmartSDR/Maestro (ex. l'écran intégré d'un FlexRadio « M »).",
+      "Nouveau : assistant indicatifs Super Check Partial + N+1 (façon N1MM/DXLog). Active-le dans Réglages → Général pour télécharger la liste communautaire MASTER.SCP ; un widget ancré en 2 colonnes affiche alors, pendant que tu tapes, les indicatifs connus qui contiennent ta saisie (Partiel) et ceux à une lettre près (N+1) — clique pour corriger un call busté.",
       "Quand un indicatif est introuvable sur QRZ/HamQTH (ou si tu n'utilises pas de service de lookup), le nom, le QTH, le locator et l'adresse sont récupérés du dernier QSO avec cette station — et c'est le locator précis de ce QSO qui est utilisé, pas le centroïde du pays de cty.dat. Un vrai résultat QRZ/HamQTH reste prioritaire."
     ]
   },

frontend/src/App.tsx

@@ -1,7 +1,7 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import {
   Activity, AlertCircle, Antenna, Bell, CheckCircle2, Clock, CloudOff, Compass, Database, Ear, Eraser, Gauge, Hash, Loader2, Lock,
-  Maximize2, Minimize2, Mic, MessageSquare, Pencil, Radio, RadioTower, RefreshCw, Satellite, Send, Settings, SlidersHorizontal, Square, Terminal, Trash2, Unlock, X, Zap,
+  Maximize2, Minimize2, Mic, MessageSquare, Pencil, Radio, RadioTower, RefreshCw, Satellite, Send, Settings, SlidersHorizontal, SpellCheck, Square, Terminal, Trash2, Unlock, X, Zap,
 } from 'lucide-react';
 
 import {
@@ -25,6 +25,7 @@ import {
   GetUltrabeamStatus, SetUltrabeamDirection,
   GetAntGeniusStatus, GetAntGeniusSettings, AntGeniusActivate,
   GetTunerGeniusStatus, GetTunerGeniusSettings, TunerGeniusAutotune, TunerGeniusSetBypass, TunerGeniusSetOperate, TunerGeniusActivate,
+  GetScpStatus, ScpLookup,
   OpenExternalURL,
   ConnectAllClusters, DisconnectAllClusters, GetClusterStatus, SendClusterCommand,
   ListClusterServers, ClusterSpotStatuses, SendClusterSpot,
@@ -71,6 +72,7 @@ import { FlexPanel } from '@/components/FlexPanel';
 import { IcomPanel } from '@/components/IcomPanel';
 import { AntGeniusPanel, type AGStatus } from '@/components/AntGeniusPanel';
 import { TunerGeniusPanel, type TGStatus } from '@/components/TunerGeniusPanel';
+import { ScpPanel, type ScpResult } from '@/components/ScpPanel';
 import { FilterBuilder, type QueryFilter } from '@/components/FilterBuilder';
 import { AwardsPanel } from '@/components/AwardsPanel';
 import { StatsPanel } from '@/components/StatsPanel';
@@ -473,6 +475,10 @@ export default function App() {
   const [agEnabled, setAgEnabled] = useState(false);
   const [tgStatus, setTgStatus] = useState<TGStatus>({ connected: false });
   const [tgEnabled, setTgEnabled] = useState(false);
+  // Super Check Partial / N+1
+  const [scpEnabled, setScpEnabled] = useState(false);
+  const [scpCount, setScpCount] = useState(0);
+  const [scpResult, setScpResult] = useState<ScpResult>({});
   // Per-port optimistic selection that the status poll must not revert until the
   // device confirms it (or it expires) — otherwise a stale poll right after a
   // click reverts the UI and the click looks like it did nothing.
@@ -1555,6 +1561,7 @@ export default function App() {
   const [showRotor, setShowRotor] = useState(() => localStorage.getItem('opslog.showRotor') !== '0');
   const [showAntGenius, setShowAntGenius] = useState(() => localStorage.getItem('opslog.showAntGenius') !== '0');
   const [showTuner, setShowTuner] = useState(() => localStorage.getItem('opslog.showTuner') !== '0');
+  const [showScp, setShowScp] = useState(() => localStorage.getItem('opslog.showScp') !== '0');
   const [showBeamOnMap, setShowBeamOnMap] = useState(() => localStorage.getItem('opslog.showBeamOnMap') !== '0');
 
   // Award code → scanned field (e.g. POTA→pota_ref, WWFF→wwff). Used to route
@@ -1786,6 +1793,31 @@ export default function App() {
     TunerGeniusActivate(ch).catch((e) => setError(String(e?.message ?? e)));
   };
 
+  // Super Check Partial: poll the enabled flag + list size so the widget shows up
+  // once the operator turns SCP on and the master list has downloaded.
+  useEffect(() => {
+    let alive = true;
+    const load = async () => {
+      try { const s: any = await GetScpStatus(); if (alive && s) { setScpEnabled(!!s.enabled); setScpCount(s.count || 0); } } catch {}
+    };
+    load();
+    const id = window.setInterval(load, 3000);
+    const off = EventsOn('scp:updated', load);
+    return () => { alive = false; window.clearInterval(id); off(); };
+  }, []);
+  // Query SCP/N+1 as the callsign changes (debounced). Skipped when disabled or
+  // the widget is hidden, so we don't hit the backend for nothing.
+  useEffect(() => {
+    if (!scpEnabled || !showScp) { setScpResult({}); return; }
+    const c = callsign.trim();
+    if (c.length < 2) { setScpResult({}); return; }
+    let alive = true;
+    const id = window.setTimeout(async () => {
+      try { const r: any = await ScpLookup(c); if (alive && r) setScpResult(r as ScpResult); } catch {}
+    }, 120);
+    return () => { alive = false; window.clearTimeout(id); };
+  }, [callsign, scpEnabled, showScp]);
+
   // RX band auto-follows the TX band (only differs for cross-band work).
   useEffect(() => { setBandRx(band); }, [band]);
 
@@ -4330,6 +4362,20 @@ export default function App() {
                 {showTuner && tgStatus.connected && <span className="absolute -top-0.5 -right-0.5 size-2 rounded-full bg-success" />}
               </button>
             )}
+            {scpEnabled && (
+              <button
+                type="button"
+                onClick={() => { const v = !showScp; setShowScp(v); writeUiPref('opslog.showScp', v ? '1' : '0'); }}
+                title={showScp ? 'Super Check Partial — shown · click to hide' : 'Super Check Partial · click to show'}
+                className={cn(
+                  'relative inline-flex items-center justify-center size-7 rounded-md border transition-colors',
+                  showScp ? 'border-success-border bg-success-muted text-success-muted-foreground hover:bg-success-muted'
+                    : 'border-border text-muted-foreground hover:bg-muted',
+                )}
+              >
+                <SpellCheck className="size-4" />
+              </button>
+            )}
             {chatAvailable && (
               <button
                 type="button"
@@ -4801,7 +4847,7 @@ export default function App() {
       {/* Reserved free space to the right. The WinKeyer CW keyer and/or the
           Digital Voice Keyer take this slot when enabled (Log4OM-style);
           otherwise it shows the QRZ profile photo. */}
-      {!compact && (chatShown || wkEnabled || dvkEnabled || lookupResult?.image_url || (showRotor && (rotatorHeading.enabled || dxPath)) || (showAntGenius && agEnabled) || (showTuner && tgEnabled) || (showLiveStations && dbConn?.backend === 'mysql')) && (
+      {!compact && (chatShown || wkEnabled || dvkEnabled || lookupResult?.image_url || (showRotor && (rotatorHeading.enabled || dxPath)) || (showAntGenius && agEnabled) || (showTuner && tgEnabled) || (showScp && scpEnabled) || (showLiveStations && dbConn?.backend === 'mysql')) && (
         // relative + absolute inner (like the F1-F5 panel): a taller widget (e.g.
         // the DVK with Auto CQ) can't grow the row — the row height stays set by
         // the entry strip and each widget fills that height, scrolling inside.
@@ -4900,6 +4946,17 @@ export default function App() {
               />
             </div>
           )}
+          {showScp && scpEnabled && (
+            <div className="w-[240px] shrink-0 min-h-0">
+              <ScpPanel
+                result={scpResult}
+                currentCall={callsign}
+                count={scpCount}
+                onPick={(c) => onCallsignInput(c, { force: true })}
+                onClose={() => { setShowScp(false); writeUiPref('opslog.showScp', '0'); }}
+              />
+            </div>
+          )}
           {dvkEnabled && (
             <div className="w-[320px] shrink-0 min-h-0">
               <DvkPanel

frontend/src/components/ScpPanel.tsx

@@ -0,0 +1,63 @@
+import { SpellCheck, X } from 'lucide-react';
+import { cn } from '@/lib/utils';
+import { useI18n } from '@/lib/i18n';
+
+export type ScpResult = { partial?: string[]; nplus1?: string[] };
+
+// ScpPanel — Super Check Partial + N+1 callsign helper, split in two columns.
+// Left: master calls that CONTAIN what you've typed (spot/correct a call). Right:
+// calls one edit away (busted-call check). Clicking a suggestion fills the entry.
+export function ScpPanel({ result, currentCall, count, onPick, onClose }: {
+  result: ScpResult;
+  currentCall: string;
+  count: number;              // master-list size (0 = list not downloaded yet)
+  onPick: (call: string) => void;
+  onClose: () => void;
+}) {
+  const { t } = useI18n();
+  const cur = (currentCall || '').trim().toUpperCase();
+  const partial = result.partial ?? [];
+  const nplus1 = result.nplus1 ?? [];
+
+  const Col = ({ title, tone, calls, empty }: { title: string; tone: string; calls: string[]; empty: string }) => (
+    <div className="flex-1 min-w-0 flex flex-col">
+      <div className={cn('text-[10px] font-bold uppercase tracking-wider px-1.5 py-1 border-b border-border/50', tone)}>{title}</div>
+      <div className="flex-1 min-h-0 overflow-y-auto p-1 space-y-0.5">
+        {calls.length === 0 ? (
+          <div className="text-[10px] text-muted-foreground/70 italic px-1 py-1">{empty}</div>
+        ) : calls.map((c) => (
+          <button key={c} type="button" onClick={() => onPick(c)}
+            title={t('scp.fill', { call: c })}
+            className={cn('w-full text-left rounded px-1.5 py-0.5 font-mono text-xs transition-colors',
+              c === cur ? 'bg-success/20 text-success font-bold'
+                : 'hover:bg-primary/15 text-foreground/90')}>
+            {c}
+          </button>
+        ))}
+      </div>
+    </div>
+  );
+
+  return (
+    <div className="h-full flex flex-col rounded-xl border border-border bg-gradient-to-b from-card to-muted/30 shadow-sm overflow-hidden">
+      <div className="flex items-center gap-2 px-3 py-2 border-b border-border/60 bg-muted/40 shrink-0">
+        <SpellCheck className={cn('size-4', count > 0 ? 'text-primary' : 'text-muted-foreground')} />
+        <span className="text-xs font-bold uppercase tracking-[0.18em] text-foreground/80">{t('scp.title')}</span>
+        <span className="flex-1" />
+        <button type="button" onClick={onClose} className="text-muted-foreground hover:text-foreground transition-colors" title={t('scp.close')}>
+          <X className="size-3.5" />
+        </button>
+      </div>
+      {count === 0 ? (
+        <div className="flex-1 min-h-0 flex items-center justify-center text-[11px] text-muted-foreground italic text-center px-3">
+          {t('scp.noList')}
+        </div>
+      ) : (
+        <div className="flex-1 min-h-0 flex divide-x divide-border/60">
+          <Col title={t('scp.partial')} tone="text-primary" calls={partial} empty={t('scp.typeMore')} />
+          <Col title="N+1" tone="text-warning" calls={nplus1} empty={t('scp.none')} />
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/SettingsModal.tsx

@@ -39,6 +39,7 @@ import {
   GetPOTAToken, SavePOTAToken,
   TestLoTWUpload, ListTQSLStationLocations,
   DownloadLoTWUsers, GetLoTWUsersStatus,
+  GetScpStatus, SetScpEnabled, DownloadScp,
   DownloadULSCounties, ULSStatus, BackfillUSCounties,
   ComputeStationInfo,
   GetUIPref, SetUIPref,
@@ -1253,6 +1254,21 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
     catch (e: any) { setLotwTest({ ok: false, msg: String(e?.message ?? e) }); }
     finally { setLotwUsersBusy(false); }
   };
+  // Super Check Partial / N+1 callsign helper: enabled flag + master-list status.
+  const [scp, setScp] = useState<{ enabled: boolean; count: number; updated?: string }>({ enabled: false, count: 0 });
+  const [scpBusy, setScpBusy] = useState(false);
+  useEffect(() => { GetScpStatus().then((s) => setScp(s as any)).catch(() => {}); }, []);
+  const toggleScp = async (on: boolean) => {
+    setScp((s) => ({ ...s, enabled: on }));
+    setScpBusy(true);
+    try { await SetScpEnabled(on); const s = await GetScpStatus(); setScp(s as any); } catch {}
+    finally { setScpBusy(false); }
+  };
+  const downloadScp = async () => {
+    setScpBusy(true);
+    try { await DownloadScp(); const s = await GetScpStatus(); setScp(s as any); } catch {}
+    finally { setScpBusy(false); }
+  };
   // US Counties (offline FCC ULS) — download progress arrives via events.
   const [ulsStatus, setUlsStatus] = useState<{ count: number; updated_at?: string }>({ count: 0 });
   const [ulsBusy, setUlsBusy] = useState(false);
@@ -4761,6 +4777,28 @@ export function SettingsModal({ onClose, onSaved, initialSection, onMainPaneChan
             <Checkbox checked={showBeamMap} onCheckedChange={(c) => { const v = !!c; setShowBeamMap(v); writeUiPref('opslog.showBeamOnMap', v ? '1' : '0'); }} />
             {t('gen.showBeam')}
           </label>
+
+          {/* Super Check Partial / N+1 — downloads the community MASTER.SCP list and
+              shows a two-column callsign helper (partial matches + one-edit calls). */}
+          <div className="border-t border-border/60 pt-3 space-y-2">
+            <label className="flex items-center gap-2 text-sm cursor-pointer">
+              <Checkbox checked={scp.enabled} disabled={scpBusy} onCheckedChange={(c) => toggleScp(!!c)} />
+              {t('scp.enable')}
+            </label>
+            <p className="text-[11px] text-muted-foreground">{t('scp.settingsHint')}</p>
+            {scp.enabled && (
+              <div className="flex items-center gap-3">
+                <Button variant="outline" size="sm" onClick={downloadScp} disabled={scpBusy}>
+                  <ArrowDown className="size-3.5" /> {scpBusy ? t('scp.downloading') : t('scp.download')}
+                </Button>
+                <span className="text-xs text-muted-foreground">
+                  {scp.count > 0
+                    ? t('scp.loaded', { n: scp.count.toLocaleString(), date: scp.updated ? new Date(scp.updated).toLocaleDateString() : '?' })
+                    : t('scp.notLoaded')}
+                </span>
+              </div>
+            )}
+          </div>
           <label className="flex items-center gap-2 text-sm cursor-pointer">
             <Checkbox checked={startEqEnd} onCheckedChange={(c) => { const v = !!c; setStartEqEnd(v); writeUiPref('opslog.startEqualsEnd', v ? '1' : '0'); }} />
             {t('gen.startEqEnd')} <span className="text-xs text-muted-foreground">{t('gen.startEqEndHint')}</span>

frontend/src/lib/i18n.tsx

@@ -283,6 +283,7 @@ const en: Dict = {
   'es.potaHint': 'Update your QSOs with the park reference from your pota.app hunter log. Paste your session token: log in at pota.app, open the browser DevTools → Network tab, click any api.pota.app request, and copy the full Authorization header value. The token expires after a while — re-copy it if the sync fails.', 'es.sessionToken': 'Session token', 'es.saving': 'Saving…', 'es.saveToken': 'Save token', 'es.potaThen': 'Then run the sync from the QSL Manager tab → service POTA hunter log (you can see and fix unmatched QSOs there).',
   'es.soon': 'soon', 'es.comingSoon': '{name} — coming soon', 'es.notWired': "This external service isn't wired up yet.",
   'lotw.usersTitle': 'LoTW user list', 'lotw.usersHint': "Downloads ARRL's public list of LoTW users + their last-upload date, to show a colour-coded LoTW badge next to a callsign (green < 1 week · amber 1–4 weeks · red > 30 days).", 'lotw.usersDownload': 'Download LoTW user list', 'lotw.usersDownloading': 'Downloading…', 'lotw.usersLoaded': '{n} users loaded · updated {date}', 'lotw.usersNone': 'Not downloaded yet — the badge stays hidden until you do.',
+  'scp.title': 'Super Check Partial', 'scp.partial': 'Partial', 'scp.close': 'Close', 'scp.fill': 'Fill {call}', 'scp.none': 'No match', 'scp.typeMore': 'Type a call…', 'scp.noList': 'Download the SCP list in Settings → General.', 'scp.enable': 'Super Check Partial / N+1 callsign helper', 'scp.settingsHint': 'Downloads the community MASTER.SCP master list and shows a two-column widget as you type a call: Partial (known calls containing what you typed) and N+1 (calls one character away) — to spot and fix a busted call.', 'scp.download': 'Update SCP list', 'scp.downloading': 'Downloading…', 'scp.loaded': '{n} calls loaded · updated {date}', 'scp.notLoaded': 'Not downloaded yet.',
   'hw.connecting': 'Connecting…', 'hw.testConn': 'Test connection', 'hw.sending': 'Sending…', 'hw.testRotator': 'Test (point to 0°)',
   // Profiles panel
   'prof.deleteConfirm': 'Delete profile "{name}"? All its settings will be lost.', 'prof.dupPrompt': 'Name for the new profile (copy of "{name}"):', 'prof.dupSuffix': '{name} Copy', 'prof.newPrompt': 'Name for the new profile:', 'prof.newDefault': 'New profile',
@@ -648,6 +649,7 @@ const fr: Dict = {
   'es.potaHint': "Met à jour tes QSO avec la référence du parc depuis ton carnet chasseur pota.app. Colle ton jeton de session : connecte-toi sur pota.app, ouvre les DevTools du navigateur → onglet Network, clique sur une requête api.pota.app, et copie toute la valeur de l'en-tête Authorization. Le jeton expire au bout d'un moment — recopie-le si la synchro échoue.", 'es.sessionToken': 'Jeton de session', 'es.saving': 'Enregistrement…', 'es.saveToken': 'Enregistrer le jeton', 'es.potaThen': "Puis lance la synchro depuis l'onglet Gestionnaire QSL → service POTA hunter log (tu peux y voir et corriger les QSO non appariés).",
   'es.soon': 'bientôt', 'es.comingSoon': '{name} — bientôt', 'es.notWired': "Ce service externe n'est pas encore branché.",
   'lotw.usersTitle': 'Liste des utilisateurs LoTW', 'lotw.usersHint': "Télécharge la liste publique ARRL des utilisateurs LoTW + leur date de dernier upload, pour afficher un badge LoTW coloré à côté d'un indicatif (vert < 1 semaine · ambre 1–4 semaines · rouge > 30 j).", 'lotw.usersDownload': 'Télécharger la liste LoTW', 'lotw.usersDownloading': 'Téléchargement…', 'lotw.usersLoaded': '{n} utilisateurs chargés · maj {date}', 'lotw.usersNone': 'Pas encore téléchargée — le badge reste caché tant que ce n’est pas fait.',
+  'scp.title': 'Super Check Partial', 'scp.partial': 'Partiel', 'scp.close': 'Fermer', 'scp.fill': 'Remplir {call}', 'scp.none': 'Aucun', 'scp.typeMore': 'Tape un indicatif…', 'scp.noList': 'Télécharge la liste SCP dans Réglages → Général.', 'scp.enable': 'Assistant indicatifs Super Check Partial / N+1', 'scp.settingsHint': "Télécharge la liste communautaire MASTER.SCP et affiche un widget en 2 colonnes pendant que tu tapes un indicatif : Partiel (indicatifs connus contenant ce que tu tapes) et N+1 (indicatifs à une lettre près) — pour repérer et corriger un call busté.", 'scp.download': 'Mettre à jour la liste SCP', 'scp.downloading': 'Téléchargement…', 'scp.loaded': '{n} indicatifs chargés · maj {date}', 'scp.notLoaded': 'Pas encore téléchargée.',
   'hw.connecting': 'Connexion…', 'hw.testConn': 'Tester la connexion', 'hw.sending': 'Envoi…', 'hw.testRotator': 'Tester (pointer vers 0°)',
   'prof.deleteConfirm': 'Supprimer le profil « {name} » ? Tous ses réglages seront perdus.', 'prof.dupPrompt': 'Nom du nouveau profil (copie de « {name} ») :', 'prof.dupSuffix': '{name} Copie', 'prof.newPrompt': 'Nom du nouveau profil :', 'prof.newDefault': 'Nouveau profil',
   'prof.hint': "Bascule entre tes identités d'opération (maison / portable / SOTA / contest). Choisis un profil ici, puis édite ses champs dans les autres sections (Informations station, etc.) — les changements sont enregistrés sur le profil sélectionné.", 'prof.active': 'ACTIF', 'prof.duplicate': 'Dupliquer', 'prof.delete': 'Supprimer', 'prof.profileName': 'Nom du profil',

frontend/wailsjs/go/main/App.d.ts

@@ -24,6 +24,7 @@ import {udp} from '../models';
 import {lotwusers} from '../models';
 import {lookup} from '../models';
 import {netctl} from '../models';
+import {scp} from '../models';
 
 export function ACOMSetOperate(arg1:boolean):Promise<void>;
 
@@ -173,6 +174,8 @@ export function DownloadConfirmations(arg1:string,arg2:boolean,arg3:string):Prom
 
 export function DownloadLoTWUsers():Promise<number>;
 
+export function DownloadScp():Promise<number>;
+
 export function DownloadULSCounties():Promise<void>;
 
 export function DuplicateProfile(arg1:number,arg2:string):Promise<profile.Profile>;
@@ -459,6 +462,8 @@ export function GetRotatorSettings():Promise<main.RotatorSettings>;
 
 export function GetSPEStatus():Promise<spe.Status>;
 
+export function GetScpStatus():Promise<main.ScpStatus>;
+
 export function GetSecretStatus():Promise<main.SecretStatus>;
 
 export function GetSlotStats():Promise<qso.SlotStats>;
@@ -855,6 +860,8 @@ export function SaveUltrabeamSettings(arg1:main.UltrabeamSettings):Promise<void>
 
 export function SaveWinkeyerSettings(arg1:main.WinkeyerSettings):Promise<void>;
 
+export function ScpLookup(arg1:string):Promise<scp.Result>;
+
 export function SearchAwardReferences(arg1:string,arg2:string,arg3:number,arg4:number):Promise<Array<awardref.Ref>>;
 
 export function SendChatMessage(arg1:string):Promise<main.ChatMessage>;
@@ -889,6 +896,8 @@ export function SetDVKLabel(arg1:number,arg2:string):Promise<void>;
 
 export function SetPassphrase(arg1:string):Promise<void>;
 
+export function SetScpEnabled(arg1:boolean):Promise<void>;
+
 export function SetTelemetryEnabled(arg1:boolean):Promise<void>;
 
 export function SetUIPref(arg1:string,arg2:string):Promise<void>;

frontend/wailsjs/go/main/App.js

@@ -298,6 +298,10 @@ export function DownloadLoTWUsers() {
   return window['go']['main']['App']['DownloadLoTWUsers']();
 }
 
+export function DownloadScp() {
+  return window['go']['main']['App']['DownloadScp']();
+}
+
 export function DownloadULSCounties() {
   return window['go']['main']['App']['DownloadULSCounties']();
 }
@@ -870,6 +874,10 @@ export function GetSPEStatus() {
   return window['go']['main']['App']['GetSPEStatus']();
 }
 
+export function GetScpStatus() {
+  return window['go']['main']['App']['GetScpStatus']();
+}
+
 export function GetSecretStatus() {
   return window['go']['main']['App']['GetSecretStatus']();
 }
@@ -1662,6 +1670,10 @@ export function SaveWinkeyerSettings(arg1) {
   return window['go']['main']['App']['SaveWinkeyerSettings'](arg1);
 }
 
+export function ScpLookup(arg1) {
+  return window['go']['main']['App']['ScpLookup'](arg1);
+}
+
 export function SearchAwardReferences(arg1, arg2, arg3, arg4) {
   return window['go']['main']['App']['SearchAwardReferences'](arg1, arg2, arg3, arg4);
 }
@@ -1730,6 +1742,10 @@ export function SetPassphrase(arg1) {
   return window['go']['main']['App']['SetPassphrase'](arg1);
 }
 
+export function SetScpEnabled(arg1) {
+  return window['go']['main']['App']['SetScpEnabled'](arg1);
+}
+
 export function SetTelemetryEnabled(arg1) {
   return window['go']['main']['App']['SetTelemetryEnabled'](arg1);
 }

frontend/wailsjs/go/models.ts

@@ -2720,6 +2720,22 @@ export namespace main {
 	        this.com_port = source["com_port"];
 	    }
 	}
+	export class ScpStatus {
+	    enabled: boolean;
+	    count: number;
+	    updated?: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new ScpStatus(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.enabled = source["enabled"];
+	        this.count = source["count"];
+	        this.updated = source["updated"];
+	    }
+	}
 	export class SecretStatus {
 	    has_passphrase: boolean;
 	    unlocked: boolean;
@@ -4323,6 +4339,25 @@ export namespace qso {
 
 }
 
+export namespace scp {
+	
+	export class Result {
+	    partial: string[];
+	    nplus1: string[];
+	
+	    static createFrom(source: any = {}) {
+	        return new Result(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.partial = source["partial"];
+	        this.nplus1 = source["nplus1"];
+	    }
+	}
+
+}
+
 export namespace solar {
 	
 	export class Data {

internal/cat/flex.go

@@ -518,7 +518,14 @@ func (f *Flex) handleStatus(payload string) {
 			alreadyBound := f.boundClientID != ""
 			f.mu.Unlock()
 			lp := strings.ToLower(program)
-			isGUI := program == "" || strings.Contains(lp, "smartsdr") || strings.Contains(lp, "maestro")
+			// The real GUI client is SmartSDR (Windows) or Maestro. Its non-GUI
+			// helpers "SmartSDR CAT" and "SmartSDR DAX" also carry "smartsdr" in the
+			// name, so exclude them — and require an explicit GUI name (dropping the
+			// old program=="" fallback that could match CAT before its program field
+			// arrived). Binding to CAT/DAX is invalid and the radio was seen to drop
+			// SmartSDR CAT (connect/disconnect loop) when a logger did this.
+			isGUI := (strings.Contains(lp, "smartsdr") || strings.Contains(lp, "maestro")) &&
+				!strings.Contains(lp, "cat") && !strings.Contains(lp, "dax")
 			if !disconnected && clientID != "" && !alreadyBound && isGUI {
 				f.mu.Lock()
 				f.boundClientID = clientID

internal/scp/scp.go

@@ -0,0 +1,270 @@
+// Package scp provides Super Check Partial (SCP) and N+1 callsign suggestions
+// from the community MASTER.SCP master file (supercheckpartial.com) — the same
+// aid contest loggers (N1MM, DXLog, Log4OM) show to catch/correct a busted call.
+//
+//   - Partial (SCP): every master call that CONTAINS what you've typed, so a
+//     mistyped or half-copied call surfaces the real ones.
+//   - N+1: master calls exactly one edit away (one char substituted, added or
+//     removed) from the full call you typed — the classic "did I bust it?" check.
+//
+// The list is downloaded once and cached on disk so it survives restarts.
+package scp
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+	"sync"
+	"time"
+)
+
+// masterURL is the community Super Check Partial master file: one callsign per
+// line, '#'-prefixed header lines. ~50k+ active contest/DX calls.
+const masterURL = "https://www.supercheckpartial.com/MASTER.SCP"
+
+const cacheFile = "MASTER.SCP"
+
+// Result is the two suggestion lists for a typed fragment.
+type Result struct {
+	Partial []string `json:"partial"` // master calls containing the fragment
+	NPlus1  []string `json:"nplus1"`  // master calls one edit away from the full call
+}
+
+// Manager holds the parsed call list + cache location.
+type Manager struct {
+	mu      sync.RWMutex
+	calls   []string  // UPPER, de-duplicated, sorted
+	updated time.Time // when the cache was last refreshed
+	dir     string
+	client  *http.Client
+}
+
+// NewManager loads any on-disk cache and returns a ready manager.
+func NewManager(dataDir string) *Manager {
+	m := &Manager{
+		dir:    dataDir,
+		client: &http.Client{Timeout: 60 * time.Second},
+	}
+	m.loadCache()
+	return m
+}
+
+func (m *Manager) path() string { return filepath.Join(m.dir, cacheFile) }
+
+func (m *Manager) loadCache() {
+	data, err := os.ReadFile(m.path())
+	if err != nil {
+		return
+	}
+	m.parse(data)
+	if fi, e := os.Stat(m.path()); e == nil {
+		m.mu.Lock()
+		m.updated = fi.ModTime()
+		m.mu.Unlock()
+	}
+}
+
+// Download fetches the latest MASTER.SCP, caches it and replaces the in-memory
+// list. Returns the number of callsigns loaded.
+func (m *Manager) Download(ctx context.Context) (int, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, masterURL, nil)
+	if err != nil {
+		return 0, err
+	}
+	req.Header.Set("User-Agent", "OpsLog")
+	resp, err := m.client.Do(req)
+	if err != nil {
+		return 0, fmt.Errorf("scp: request failed: %w", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return 0, fmt.Errorf("scp: http %d", resp.StatusCode)
+	}
+	body, err := io.ReadAll(io.LimitReader(resp.Body, 32*1024*1024))
+	if err != nil {
+		return 0, fmt.Errorf("scp: read: %w", err)
+	}
+	n := m.parse(body)
+	if n == 0 {
+		return 0, fmt.Errorf("scp: file parsed to 0 callsigns")
+	}
+	_ = os.WriteFile(m.path(), body, 0o644) // best-effort cache
+	m.mu.Lock()
+	m.updated = time.Now()
+	m.mu.Unlock()
+	return n, nil
+}
+
+// parse loads the SCP bytes into the sorted call slice and returns the count.
+func (m *Manager) parse(data []byte) int {
+	seen := make(map[string]struct{}, 1<<17)
+	sc := bufio.NewScanner(bytes.NewReader(data))
+	sc.Buffer(make([]byte, 1024*1024), 1024*1024)
+	for sc.Scan() {
+		line := strings.ToUpper(strings.TrimSpace(sc.Text()))
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue // blank / header comment
+		}
+		// A call token only (the master file is one call per line, but guard
+		// against stray trailing fields).
+		if i := strings.IndexAny(line, " \t,;"); i >= 0 {
+			line = line[:i]
+		}
+		if !plausibleCall(line) {
+			continue
+		}
+		seen[line] = struct{}{}
+	}
+	if len(seen) == 0 {
+		return 0
+	}
+	calls := make([]string, 0, len(seen))
+	for c := range seen {
+		calls = append(calls, c)
+	}
+	sort.Strings(calls)
+	m.mu.Lock()
+	m.calls = calls
+	m.mu.Unlock()
+	return len(calls)
+}
+
+// plausibleCall keeps a token that looks like a callsign: length 3–12, at least
+// one digit and one letter, only A–Z/0–9//.
+func plausibleCall(s string) bool {
+	if len(s) < 3 || len(s) > 12 {
+		return false
+	}
+	hasDigit, hasAlpha := false, false
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch {
+		case c >= '0' && c <= '9':
+			hasDigit = true
+		case c >= 'A' && c <= 'Z':
+			hasAlpha = true
+		case c == '/':
+		default:
+			return false
+		}
+	}
+	return hasDigit && hasAlpha
+}
+
+// Lookup returns the Partial (substring) and N+1 (one-edit) suggestions for the
+// typed fragment. limit caps EACH list. Partial needs ≥2 chars; N+1 needs ≥3
+// (a plausible whole call) and is skipped otherwise.
+func (m *Manager) Lookup(fragment string, limit int) Result {
+	q := strings.ToUpper(strings.TrimSpace(fragment))
+	if len(q) < 2 {
+		return Result{}
+	}
+	if limit <= 0 {
+		limit = 50
+	}
+	m.mu.RLock()
+	calls := m.calls
+	m.mu.RUnlock()
+
+	wantN1 := len(q) >= 3
+	type pm struct {
+		call   string
+		prefix bool
+	}
+	var partial []pm
+	var nplus1 []string
+	for _, c := range calls {
+		if c == q {
+			partial = append(partial, pm{c, true}) // exact = strongest match
+			continue
+		}
+		if idx := strings.Index(c, q); idx >= 0 {
+			partial = append(partial, pm{c, idx == 0})
+		}
+		if wantN1 && len(nplus1) < limit*2 && editDistanceOne(q, c) {
+			nplus1 = append(nplus1, c)
+		}
+	}
+	// Prefix matches first, then the rest (both already alphabetical since `calls`
+	// is sorted and we scanned in order).
+	sort.SliceStable(partial, func(i, j int) bool {
+		if partial[i].prefix != partial[j].prefix {
+			return partial[i].prefix
+		}
+		return false
+	})
+	out := Result{Partial: []string{}, NPlus1: []string{}}
+	for _, p := range partial {
+		if len(out.Partial) >= limit {
+			break
+		}
+		out.Partial = append(out.Partial, p.call)
+	}
+	if len(nplus1) > limit {
+		nplus1 = nplus1[:limit]
+	}
+	out.NPlus1 = append(out.NPlus1, nplus1...)
+	return out
+}
+
+// editDistanceOne reports whether a and b are exactly one edit apart (one
+// substitution, insertion or deletion) — never equal (distance 0 returns false).
+func editDistanceOne(a, b string) bool {
+	la, lb := len(a), len(b)
+	if la == lb {
+		diff := 0
+		for i := 0; i < la; i++ {
+			if a[i] != b[i] {
+				diff++
+				if diff > 1 {
+					return false
+				}
+			}
+		}
+		return diff == 1
+	}
+	// Ensure a is the shorter one; lengths must differ by exactly 1.
+	if la > lb {
+		a, b = b, a
+		la, lb = lb, la
+	}
+	if lb-la != 1 {
+		return false
+	}
+	// b is a with one extra char: walk both, allowing a single skip in b.
+	i, j, skipped := 0, 0, false
+	for i < la && j < lb {
+		if a[i] == b[j] {
+			i++
+			j++
+			continue
+		}
+		if skipped {
+			return false
+		}
+		skipped = true
+		j++ // skip the extra char in the longer string
+	}
+	return true
+}
+
+// Count returns how many callsigns are loaded.
+func (m *Manager) Count() int {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return len(m.calls)
+}
+
+// Updated returns when the list was last refreshed (zero if never).
+func (m *Manager) Updated() time.Time {
+	m.mu.RLock()
+	defer m.mu.RUnlock()
+	return m.updated
+}

telemetry.go

@@ -88,12 +88,30 @@ func (a *App) sendTelemetryHeartbeat() {
 	// distinct_id identifies the USER. Prefer the station callsign — it's stable
 	// across every machine/reinstall the same operator runs, so one op counts as
 	// one user (a callsign is public in amateur radio). The random per-install ID
-	// is only a fallback until a callsign is configured; without it the same op on
-	// a laptop + desktop + Maestro showed up as three "users". install_id rides
-	// along as a property so multiple machines under one callsign stay visible.
+	// is only a fallback; without it the same op on a laptop + desktop + Maestro
+	// showed up as three "users". install_id rides along as a property so multiple
+	// machines under one callsign stay visible.
+	//
+	// On a FRESH INSTALL the callsign isn't configured yet at launch, so sending
+	// straight away would record the machine's random UUID (and the once-a-day lock
+	// would then keep it that way even after the op enters their call). Instead wait
+	// a while for the callsign to appear (Settings → Station Information) and only
+	// fall back to the UUID if none shows up within the grace window — so a genuine
+	// no-callsign install is still counted, but the normal case gets the callsign.
+	call := a.activeCallsign()
+	for i := 0; call == "" && i < 60; i++ { // up to ~10 min (60 × 10 s)
+		time.Sleep(10 * time.Second)
+		if a.settings == nil || !a.GetTelemetryEnabled() {
+			return // disabled meanwhile
+		}
+		if last, _ := a.settings.GetGlobal(a.ctx, keyTelemetryLastSent); strings.TrimSpace(last) == today {
+			return // sent by another path in the meantime
+		}
+		call = a.activeCallsign()
+	}
 	installID := a.telemetryInstallID()
 	distinctID := installID
-	if call := a.activeCallsign(); call != "" {
+	if call != "" {
 		distinctID = call
 	}
 	payload := map[string]any{