Reset modem when upper_tester terminates

@brief    Command-line entry point: python3.13 -m upper_tester --device /dev/quectel_at --port 12100

@details  Opens the modem, sends `ATE0` once (disable command echo so lines can be told

          apart from responses), and serves the upper-tester TCP protocol (see server.py)

          until interrupted.

          until interrupted (Ctrl-C), at which point the modem is reset (AT+CFUN=1,1)

          before the device is closed, so it isn't left in whatever state the last

          in-flight AT command left it in.

"""

import argparse

import asyncio

    try:

        asyncio.run(run())

    except KeyboardInterrupt:

        pass

        log = logging.getLogger("ut")

        log.info("Ctrl-C received: resetting the modem before exit")

        try:

            ok, text = modem.execute("AT+CFUN=1,1")

            log.info("AT+CFUN=1,1 -> %s %r", ok, text)

        except OSError as e:

            log.error("modem reset on exit failed: %s", e)

    finally:

        modem.close()