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Fix waterfall-to-listen SDR busy race condition

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Wait for server-side WebSocket stop confirmation before closing the
connection, ensuring the IQ process is fully terminated and the USB
device released. Add retry logic with back-off in the audio start
endpoint as defense-in-depth for any remaining timing gaps.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Smittix
2026-02-09 13:58:42 +00:00
parent a2a7ac8fec
commit a8f2912b90
2 changed files with 49 additions and 16 deletions
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28
static/js/modes/listening-post.js
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@@ -3943,11 +3943,31 @@ async function stopWaterfall() {
// WebSocket path
if (waterfallUseWebSocket && waterfallWebSocket) {
const ws = waterfallWebSocket;
try {
if (waterfallWebSocket.readyState === WebSocket.OPEN) {
waterfallWebSocket.send(JSON.stringify({ cmd: 'stop' }));
if (ws.readyState === WebSocket.OPEN) {
// Wait for server to confirm stop (it terminates the IQ
// process and releases the USB device before responding).
await new Promise((resolve) => {
const timeout = setTimeout(resolve, 4000);
const prevHandler = ws.onmessage;
ws.onmessage = (event) => {
if (typeof event.data === 'string') {
try {
const msg = JSON.parse(event.data);
if (msg.status === 'stopped') {
clearTimeout(timeout);
resolve();
return;
}
} catch (_) {}
}
if (prevHandler) prevHandler(event);
};
ws.send(JSON.stringify({ cmd: 'stop' }));
});
}
waterfallWebSocket.close();
ws.close();
} catch (e) {
console.error('[WATERFALL] WebSocket stop error:', e);
}
@@ -3958,8 +3978,6 @@ async function stopWaterfall() {
if (typeof releaseDevice === 'function') {
releaseDevice('waterfall');
}
// Allow backend WebSocket handler to finish cleanup and release SDR
await new Promise(resolve => setTimeout(resolve, 300));
return;
}