preserve hardened USB smoke evidence

tools/capture_binary.py

@@ -6,6 +6,7 @@ import csv
 import glob
 import signal
 import sys
+import time
 from contextlib import ExitStack
 from datetime import datetime
 from pathlib import Path
@@ -27,6 +28,11 @@ def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser()
     parser.add_argument("--port", help="serial port; auto-detected when omitted")
     parser.add_argument("--baud", type=int, default=115200)
+    parser.add_argument(
+        "--reset",
+        action="store_true",
+        help="hard-reset the ESP32-C3 after opening the serial port",
+    )
     parser.add_argument("--output", type=Path, help="validated binary .trk output")
     parser.add_argument("--csv", type=Path, help="decoded CSV output")
     parser.add_argument(
@@ -109,6 +115,16 @@ def main() -> int:
                 if args.wire is not None
                 else None
             )
+            if args.reset:
+                # Match ESP-IDF monitor's USB Serial/JTAG hard-reset state:
+                # release DTR/RTS first, discard the old session, pulse reset,
+                # and keep this same reader open for the new boot stream.
+                sensor.dtr = False
+                sensor.rts = False
+                sensor.reset_input_buffer()
+                sensor.rts = True
+                time.sleep(0.2)
+                sensor.rts = False
             writer = csv.writer(decoded)
             writer.writerow(CSV_COLUMNS)
             while not stop_requested: