upscmd python3 rewrite for telnetlib3

upscmd.py

#!/usr/bin/python3
import asyncio, telnetlib3
import sys

user = "REPLACEME_UPS_USER"
pwd = "REPLACEME_UPS_PWD"

if len(sys.argv) == 2:
    cmd = sys.argv[1]
else:
    print("the ups command to issue is missing.")
    print("example: upscmd.py beeper.enable")
    exit(1)


async def main():
    reader, writer = await telnetlib3.open_connection('127.0.0.1', 3493)
    writer.write("USERNAME {0}\n".format(user))
    response = await reader.readuntil(b"OK")
    print("USERNAME cmd status: {0}".format(response.decode('ascii').strip()))

    writer.write("PASSWORD {0}\n".format(pwd))
    response = await reader.readuntil(b"OK")
    print("PASSWORD cmd status: {0}".format(response.decode('ascii').strip()))

    writer.write("INSTCMD ups {0}\n".format(cmd))
    response = await reader.readuntil(b"OK")
    print("INSTCMD cmd status: {0}".format(response.decode('ascii').strip()))

    writer.write("LOGOUT\n")
    writer.close()

asyncio.run(main())