try to read gpsfake

from twisted.application import internet, service
from twisted.web import server
from twisted.internet import ssl

from twisted.internet import reactor
from twisted.internet.serialport import SerialPort
from twisted.protocols.basic import LineReceiver

import operator
from twisted.python.compat import reduce

import traceback
import string
import time
import jsonrpclib
import json

from math import *


lastgpsloc = 'empty'
lastrpt = time.time()


class gpsReceiver(LineReceiver):
    def __init__(self):
        print 'debug : gpsreceiver init'

    def gpsValid(self, line):
        if not line.startswith('$GPRMC'):
            return False
        strmessage, checksum = line[1:].strip().split('*')
        message = strmessage.split(',')
        checksum, calculated_checksum = int(checksum, 16), reduce(operator.xor, map(ord, strmessage))
        if checksum != calculated_checksum:
            return False
        return True

    def lineReceived(self, line):
        print 'GPS RECEIVED !'
        global lastrpt
        global lastgpsloc
        if self.gpsValid(line) :
            lastgpsloc = line
            print lastgpsloc
            if time.time() - lastrpt >= 1 :
                print 'TIME TO REPORT'
        else :
            print 'Invalid GPS -> %s' % (line)


class SerialService(service.Service):
    def startService(self):
        print 'debug : Serial Service start'
        try:
            self.gpsport = gpsport
        except :
            print 'GPSport failed'


#Create Application
application = service.Application("Serial MultiService Example")

#Seting Serial
gpsport = SerialPort(gpsReceiver(), '/dev/pts/4', reactor,baudrate=4800)

#Create serialService
#as told at http://www.mentby.com/lucas-taylor/serialport-protocol-as-a-service.html
serialService = SerialService()

#Creating Multi Service
multiService = service.MultiService()
#Add our Services to multiservice
serialService.setServiceParent(multiService)

#Set created application to be serviceparent of multiservice
multiService.setServiceParent(application)