#!/usr/bin/python

import serial
import os
import sys

usbport = -1
usbinfo = open("/proc/tty/driver/usbserial")
for line in usbinfo:
  if "product:0028" in line:
    if usbport == -1:
      usbport = int((line.partition(":"))[0])
if usbport != -1:
  thistty = "/dev/ttyUSB" + str(usbport)
  ser = serial.Serial(thistty, 115200, timeout=2)
  ser.open ()

  at_command = 'AT+CDV*22899;\r\n'
  ser.write(at_command)
  ser.sendBreak()
  ser.sendBreak()
  line = ser.read(ser.inWaiting())

  ser.close
  sys.exit(0)
else:
  sys.exit(1)