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Fix waterfall crash on zoom by reusing WebSocket and adding USB release retry

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Zooming caused "I/Q capture process exited immediately" because the client
closed the WebSocket and opened a new one, racing with the old rtl_sdr
process releasing the USB device. Now zoom/retune sends a start command on
the existing WebSocket, and the server adds a USB release delay plus retry
loop when restarting capture within the same connection.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-08 14:00:40 +00:00
parent ca5f08d88a
commit 099a59355a
2 changed files with 77 additions and 19 deletions
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static/js/modes/listening-post.js
+42 -2
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@@ -3250,6 +3250,26 @@ async function syncWaterfallToFrequency(freq, options = {}) {
if (isDirectListening || waterfallMode === 'audio') return { started: false };
if (isWaterfallRunning && waterfallMode === 'rf' && restartIfRunning) {
// Reuse existing WebSocket to avoid USB device release race
if (waterfallUseWebSocket && waterfallWebSocket && waterfallWebSocket.readyState === WebSocket.OPEN) {
const sf = parseFloat(document.getElementById('waterfallStartFreq')?.value || 88);
const ef = parseFloat(document.getElementById('waterfallEndFreq')?.value || 108);
const fft = parseInt(document.getElementById('waterfallFftSize')?.value || document.getElementById('waterfallBinSize')?.value || 1024);
const g = parseInt(document.getElementById('waterfallGain')?.value || 40);
const dev = typeof getSelectedDevice === 'function' ? getSelectedDevice() : 0;
waterfallWebSocket.send(JSON.stringify({
cmd: 'start',
center_freq: (sf + ef) / 2,
span_mhz: Math.max(0.1, ef - sf),
gain: g,
device: dev,
sdr_type: (typeof getSelectedSdrType === 'function') ? getSelectedSdrType() : 'rtlsdr',
fft_size: fft,
fps: 25,
avg_count: 4,
}));
return { started: true };
}
await stopWaterfall();
return await startWaterfall({ silent: silent });
}
@@ -3275,8 +3295,28 @@ async function zoomWaterfall(direction) {
setWaterfallRange(center, newSpan);
if (isWaterfallRunning && waterfallMode === 'rf' && !isDirectListening) {
await stopWaterfall();
await startWaterfall({ silent: true });
// Reuse existing WebSocket to avoid USB device release race
if (waterfallUseWebSocket && waterfallWebSocket && waterfallWebSocket.readyState === WebSocket.OPEN) {
const sf = parseFloat(document.getElementById('waterfallStartFreq')?.value || 88);
const ef = parseFloat(document.getElementById('waterfallEndFreq')?.value || 108);
const fft = parseInt(document.getElementById('waterfallFftSize')?.value || document.getElementById('waterfallBinSize')?.value || 1024);
const g = parseInt(document.getElementById('waterfallGain')?.value || 40);
const dev = typeof getSelectedDevice === 'function' ? getSelectedDevice() : 0;
waterfallWebSocket.send(JSON.stringify({
cmd: 'start',
center_freq: (sf + ef) / 2,
span_mhz: Math.max(0.1, ef - sf),
gain: g,
device: dev,
sdr_type: (typeof getSelectedSdrType === 'function') ? getSelectedSdrType() : 'rtlsdr',
fft_size: fft,
fps: 25,
avg_count: 4,
}));
} else {
await stopWaterfall();
await startWaterfall({ silent: true });
}
}
}