freitag

scripts/capture_csv.py

@@ -22,6 +22,10 @@ FALLBACK_HEADER = (
 
 SENSOR_CHANNELS = [2, 3, 4, 5]
 
+# If no bytes at all arrive for this long, treat the device as hung (e.g. an
+# I2C bus lockup freezing the Arduino) rather than looping forever in silence.
+DEFAULT_STALL_TIMEOUT_S = 20.0
+
 _FAN_PCT_RE = re.compile(r"\((\d+)%\)")
 _FAN_PWM_RE = re.compile(r"^(\d+)/")
 
@@ -206,6 +210,11 @@ def enable_dryer_logging(ser, retries: int = 3) -> None:
     print("WARN: did not see 'OK csv logging on' — continuing anyway", file=sys.stderr)
 
 
+def log_notice(message: str) -> None:
+    stamp = datetime.now(timezone.utc).isoformat(timespec="seconds")
+    print(f"{stamp} {message}", file=sys.stderr)
+
+
 def cmd_log(args: argparse.Namespace) -> int:
     from dryer_tui import parse_status
 
@@ -214,6 +223,7 @@ def cmd_log(args: argparse.Namespace) -> int:
     if out is None:
         out = args.log_dir / f"dryer_{datetime.now():%Y%m%d_%H%M%S}.csv"
 
+    stall_timeout = args.stall_timeout
     print(f"Logging {port} -> {out}", file=sys.stderr)
     if args.auto_log_on:
         print("Will send 'log on' after connect", file=sys.stderr)
@@ -223,6 +233,7 @@ def cmd_log(args: argparse.Namespace) -> int:
         if args.auto_log_on:
             enable_dryer_logging(ser)
 
+        last_activity = time.monotonic()
         while True:
             try:
                 raw = ser.readline()
@@ -230,10 +241,26 @@ def cmd_log(args: argparse.Namespace) -> int:
                 print(f"\nStopped ({session.row_count} rows).", file=sys.stderr)
                 session.close()
                 return 0
+            except Exception as exc:
+                log_notice(
+                    f"ERROR: serial read failed ({exc}) — closing after "
+                    f"{session.row_count} rows"
+                )
+                session.close()
+                return 1
 
             if not raw:
+                if time.monotonic() - last_activity >= stall_timeout:
+                    log_notice(
+                        f"WARN: no data from {port} for {stall_timeout:.0f}s — "
+                        f"device likely hung (e.g. I2C bus lockup on the Arduino) "
+                        f"— closing after {session.row_count} rows"
+                    )
+                    session.close()
+                    return 1
                 continue
 
+            last_activity = time.monotonic()
             line = decode_line(raw)
             parsed = parse_status(line)
             if parsed:
@@ -277,6 +304,15 @@ def build_parser() -> argparse.ArgumentParser:
         default=True,
         help="Send 'log on' after connect in log mode (default: on)",
     )
+    parser.add_argument(
+        "--stall-timeout",
+        type=float,
+        default=DEFAULT_STALL_TIMEOUT_S,
+        help=(
+            "log mode: seconds without any data before treating the device as "
+            f"hung and exiting (default: {DEFAULT_STALL_TIMEOUT_S:.0f})"
+        ),
+    )
 
     subparsers = parser.add_subparsers(dest="action")
     log_p = subparsers.add_parser("log", help="Headless CSV capture", add_help=False)
@@ -285,6 +321,7 @@ def build_parser() -> argparse.ArgumentParser:
     log_p.add_argument("-o", "--output", type=Path)
     log_p.add_argument("--log-dir", type=Path, default=Path("logs"))
     log_p.add_argument("--auto-log-on", action=argparse.BooleanOptionalAction, default=True)
+    log_p.add_argument("--stall-timeout", type=float, default=DEFAULT_STALL_TIMEOUT_S)
 
     tui_p = subparsers.add_parser("tui", help="Interactive curses dashboard")
     tui_p.add_argument("-p", "--port")