feat(tscm): add custom frequency range option to RF sweep

Adds a "Custom Range" sweep type that lets users specify start/end MHz
instead of using a fixed preset. Useful in dense RF environments where
a full or standard sweep returns too many signals and causes slowdown.

UI shows start/end MHz inputs when "Custom Range" is selected. Range is
validated (0 < start < end ≤ 6000 MHz) before the sweep starts.
Backend threads the ranges through to _scan_rf_signals(), which already
supports arbitrary frequency bands.

Closes #172

routes/tscm/__init__.py

@@ -490,6 +490,7 @@ def _start_sweep_internal(
     bt_interface: str = '',
     sdr_device: int | None = None,
     verbose_results: bool = False,
+    custom_ranges: list[dict] | None = None,
 ) -> dict:
     """Start a TSCM sweep without request context."""
     global _sweep_running, _sweep_thread, _current_sweep_id
@@ -532,7 +533,7 @@ def _start_sweep_internal(
     _sweep_thread = threading.Thread(
         target=_run_sweep,
         args=(sweep_type, baseline_id, wifi_enabled, bt_enabled, rf_enabled,
-              wifi_interface, bt_interface, sdr_device, verbose_results),
+              wifi_interface, bt_interface, sdr_device, verbose_results, custom_ranges),
         daemon=True
     )
     _sweep_thread.start()
@@ -1127,7 +1128,8 @@ def _run_sweep(
     wifi_interface: str = '',
     bt_interface: str = '',
     sdr_device: int | None = None,
-    verbose_results: bool = False
+    verbose_results: bool = False,
+    custom_ranges: list[dict] | None = None,
 ) -> None:
     """
     Run the TSCM sweep in a background thread.
@@ -1504,7 +1506,7 @@ def _run_sweep(
                         'rf_count': len(all_rf),
                     })
                     # Try RF scan even if sdr_device is None (will use device 0)
-                    rf_signals = _scan_rf_signals(sdr_device, sweep_ranges=preset.get('ranges'))
+                    rf_signals = _scan_rf_signals(sdr_device, sweep_ranges=custom_ranges or preset.get('ranges'))
 
                     # If no signals and this is first RF scan, send info event
                     if not rf_signals and last_rf_scan == 0:

routes/tscm/sweep.py

@@ -58,6 +58,25 @@ def start_sweep():
     bt_interface = data.get('bt_interface', '')
     sdr_device = data.get('sdr_device')
 
+    # Validate custom frequency ranges if provided
+    custom_ranges = None
+    if sweep_type == 'custom':
+        raw_ranges = data.get('custom_ranges') or []
+        validated = []
+        for rng in raw_ranges:
+            try:
+                start = float(rng.get('start', 0))
+                end = float(rng.get('end', 0))
+                step = float(rng.get('step', 0.1))
+                if 0 < start < end <= 6000:
+                    validated.append({'start': start, 'end': end, 'step': step,
+                                      'name': rng.get('name') or f'{start:.0f}–{end:.0f} MHz'})
+            except (TypeError, ValueError):
+                pass
+        if not validated:
+            return jsonify({'status': 'error', 'message': 'custom sweep requires valid start/end MHz'}), 400
+        custom_ranges = validated
+
     result = _start_sweep_internal(
         sweep_type=sweep_type,
         baseline_id=baseline_id,
@@ -68,6 +87,7 @@ def start_sweep():
         bt_interface=bt_interface,
         sdr_device=sdr_device,
         verbose_results=verbose_results,
+        custom_ranges=custom_ranges,
     )
     http_status = result.pop('http_status', 200)
     return jsonify(result), http_status

templates/index.html

@@ -12082,6 +12082,12 @@
         async function startTscmSweep() {
             const sweepType = document.getElementById('tscmSweepType').value;
             const baselineId = document.getElementById('tscmBaselineSelect').value || null;
+            const customRanges = sweepType === 'custom' ? [{
+                start: parseFloat(document.getElementById('tscmCustomStartMhz').value),
+                end: parseFloat(document.getElementById('tscmCustomEndMhz').value),
+                step: 0.1,
+                name: `Custom ${document.getElementById('tscmCustomStartMhz').value}–${document.getElementById('tscmCustomEndMhz').value} MHz`
+            }] : null;
             const wifiEnabled = document.getElementById('tscmWifiEnabled').checked;
             const btEnabled = document.getElementById('tscmBtEnabled').checked;
             const rfEnabled = document.getElementById('tscmRfEnabled').checked;
@@ -12122,7 +12128,8 @@
                         wifi_interface: wifiInterface,
                         bt_interface: btInterface,
                         sdr_device: sdrDevice ? parseInt(sdrDevice) : null,
-                        verbose_results: verboseResults
+                        verbose_results: verboseResults,
+                        custom_ranges: customRanges
                     })
                 });
 
@@ -12891,7 +12898,7 @@
                     if (tscmSweepStartTime) {
                         const elapsed = (Date.now() - tscmSweepStartTime) / 1000;
                         const sweepType = document.getElementById('tscmSweepType')?.value || 'standard';
-                        const durations = { quick: 120, standard: 300, full: 900 };
+                        const durations = { quick: 120, standard: 300, full: 900, custom: 300 };
                         const maxDuration = durations[sweepType] || 300;
                         const progress = Math.min(95, (elapsed / maxDuration) * 100);
                         updateTscmProgress({ progress: Math.round(progress), phase: 'Scanning' });

templates/partials/modes/tscm.html

@@ -6,14 +6,28 @@
 
                         <div class="form-group">
                             <label>Sweep Type</label>
-                            <select id="tscmSweepType">
+                            <select id="tscmSweepType" onchange="document.getElementById('tscmCustomRangeControls').style.display = this.value === 'custom' ? 'block' : 'none'">
                                 <option value="quick">Quick Scan (2 min)</option>
                                 <option value="standard" selected>Standard (5 min)</option>
                                 <option value="full">Full Sweep (15 min)</option>
                                 <option value="wireless_cameras">Wireless Cameras</option>
                                 <option value="body_worn">Body-Worn Devices</option>
                                 <option value="gps_trackers">GPS Trackers</option>
+                                <option value="custom">Custom Range</option>
                             </select>
+                            <div id="tscmCustomRangeControls" style="display: none; margin-top: 8px;">
+                                <div style="display: flex; gap: 8px;">
+                                    <div style="flex: 1;">
+                                        <label style="font-size: 10px; color: var(--text-dim);">Start (MHz)</label>
+                                        <input type="number" id="tscmCustomStartMhz" value="400" min="1" max="6000" step="1">
+                                    </div>
+                                    <div style="flex: 1;">
+                                        <label style="font-size: 10px; color: var(--text-dim);">End (MHz)</label>
+                                        <input type="number" id="tscmCustomEndMhz" value="500" min="1" max="6000" step="1">
+                                    </div>
+                                </div>
+                                <p class="info-text" style="font-size: 10px; color: var(--text-dim); margin-top: 3px;">Step: 100 kHz. Duration: ~5 min.</p>
+                            </div>
                         </div>
 
                         <div class="form-group">