import sys at top

api/ble.py

@@ -20,7 +20,7 @@ provided for convenience.
 import asyncio
 import subprocess
 import time
-import warnings, logging
+import warnings, logging, sys
 warnings.filterwarnings("ignore")
 logging.getLogger('apscheduler').setLevel(logging.ERROR)
 from dataclasses import dataclass
@@ -310,7 +310,6 @@ def test(test_count = 0) -> None:
 # --------------------------------------------------------------------------- #
 if __name__ == "__main__":
     import json
-    import sys
     _file_handler = logging.FileHandler("ble-test.log", mode="a")
     _file_handler.setLevel(logging.INFO)      # same level (or tweak)
     _file_handler.setFormatter(_stdout_handler.formatter)  # reuse formatter