Add listening audio debug endpoint

routes/audio_websocket.py

@@ -229,7 +229,11 @@ def init_audio_websocket(app: Flask):
                 except TimeoutError:
                     pass
                 except Exception as e:
-                    if "timed out" not in str(e).lower():
+                    msg = str(e).lower()
+                    if "connection closed" in msg:
+                        logger.info("WebSocket closed by client")
+                        break
+                    if "timed out" not in msg:
                         logger.error(f"WebSocket receive error: {e}")
 
                 # Stream audio data if active

routes/listening_post.py

@@ -870,6 +870,33 @@ def audio_status() -> Response:
     })
 
 
+@listening_post_bp.route('/audio/debug')
+def audio_debug() -> Response:
+    """Get audio debug status and recent stderr logs."""
+    rtl_log_path = '/tmp/rtl_fm_stderr.log'
+    ffmpeg_log_path = '/tmp/ffmpeg_stderr.log'
+
+    def _read_log(path: str) -> str:
+        try:
+            with open(path, 'r') as handle:
+                return handle.read().strip()
+        except Exception:
+            return ''
+
+    return jsonify({
+        'running': audio_running,
+        'frequency': audio_frequency,
+        'modulation': audio_modulation,
+        'sdr_type': scanner_config.get('sdr_type', 'rtlsdr'),
+        'device': scanner_config.get('device', 0),
+        'gain': scanner_config.get('gain', 0),
+        'squelch': scanner_config.get('squelch', 0),
+        'audio_process_alive': bool(audio_process and audio_process.poll() is None),
+        'rtl_fm_stderr': _read_log(rtl_log_path),
+        'ffmpeg_stderr': _read_log(ffmpeg_log_path),
+    })
+
+
 @listening_post_bp.route('/audio/stream')
 def stream_audio() -> Response:
     """Stream MP3 audio."""