listen.py

#!/usr/bin/env python
#Original Code Martin Bateman 2013
#Modified by Simon Walters
#GPLv2 applies
#V0.1 2Aug13

import sys
from socket import *
from subprocess import Popen, call
import shlex
import os
import sys

def getserial():
  # Extract serial from cpuinfo file
  cpuserial = "0000000000000000"
  try:
    f = open('/proc/cpuinfo','r')
    for line in f:
      if line[0:6]=='Serial':
        cpuserial = line[10:26]
    f.close()
  except:
    cpuserial = "ERROR000000000"

  return cpuserial
  
myserial = getserial()
print myserial
print myserial[-4:]
s = socket(AF_INET, SOCK_DGRAM)
s.bind(('', 50000))
s.settimeout(300)


while 1:
    try:
        #print "try reading socket"
        data, wherefrom = s.recvfrom(1500, 0) # get the data from the socket

    except (KeyboardInterrupt, SystemExit):
        #print "reraise error"
        raise
    except timeout:
        print "No data received: socket timeout"
        #print sys.exc_info()[0]
        break
#    except:
#        print "Unknown error occured with receiving data"
#        continue    

    print (data + " " + repr(wherefrom[0]))

#    if (data.find("Start SID" + myserial[-4:]) != -1):
#       call(['sudo', 'python', '/home/pi/simplesi_scratch_handler/scratch_gpio_handler2.py', str(repr(wherefrom[0]))])
#        break

    
sys.exit()