#!/usr/bin/python

import serial
import sys
import re
import time
from os import listdir
from os.path import isfile, join

DEVDIR = "/dev"

ttyfn = [f for f in listdir(DEVDIR) if re.match(r'^ttyUSB', f)]

for devfn in ttyfn:
  print devfn
  ser = serial.Serial(join(DEVDIR,devfn), 115200, bytesize=8, parity='N', stopbits=1, timeout=1, xonxoff=0, rtscts=0)

  ser.write("\rAT\r")
  ser.flush()
  x0 = ser.readline()
  print "at n (0):", x0
  x1 = ser.readline()
  print "at n (1):", x1
  x2 = ser.readline()
  print "at n (2):", x2
  time.sleep(1)

  x0 = x0.strip()
  x1 = x1.strip()
  x2 = x2.strip()

  if (x0 == "ok" or x0 == "OK" or
      x1 == "ok" or x1 == "OK" or
      x2 == "ok" or x2 == "OK"):
    print join(DEVDIR,devfn), "->", join(DEVDIR,"ttyGPRS")

  if (x0[0:4] == "/?: " or
      x1[0:4] == "/?: " or
      x2[0:4] == "/?: "):
    print join(DEVDIR,devfn), "->", join(DEVDIR,"ttyPIU")