Difference between revisions of "KNX contactless"

Revision as of 15:15, 6 November 2013

WAV-Files

• Sample WAV-File at 44.1kHz sampling frequency The sound was sampled at 96kHz and than downsampled to 44.1kHz in order to make in playable on most sound cards.
• Sample WAV-File at 96kHz sampling frequency
• Sample WAV-File at 96kHz sampling frequency

See [1] for information about the file format.

Programm

Created on 30.09.2013

@author: thm

import struct

1. f = open('/Users/thm/Downloads/test.raw', 'rb')

f = open('/Users/thm/Documents/workspace/KNX Forensics/Data/Sample3.wav', 'rb') f.seek(46) sample1 = 0 sample2 = 0 sample3 = 0 lasti = 0 decoded = '0' ordered = hexvalue = telegrambytes = [] i = 1 while True:

   sample1 = sample2
   sample2 = sample3
   buf = f.read(4)
   if not buf: break
   sample3 = struct.unpack('<f', buf)[0]
   if sample1 < sample2:
       if sample2 >= sample3:
           if sample2 > 0.1:
               samplessincelast = i - lasti
               print i, sample2, samplessincelast, decoded
               if (samplessincelast > 155) and (decoded != ):
                   print 'Full telegram ', decoded, hex(int(decoded, 2))
                   databits = 
                   char = 
                   symbol = 
                   length = len(decoded)
                   if length > 11:
                       for pos in range(0,length):
                           symbol = symbol + decoded[pos]
                           if len(symbol) == 13:
                               startbit = symbol[0]
                               paritybit = symbol[9]
                               stopbit = symbol[10]
                               gap = symbol[11] + symbol[12]
                               for symbolpos in range(1,9):
                                   databits = symbol[symbolpos] + databits
                               ordered = ordered + databits + ' '
                               telegrambytes.append(databits)
                               hexvalue = hexvalue + hex(int(databits, 2)) + ' '
                               print 'Symbol', symbol, 'Startbit', startbit, 'Databits (LSB first)', databits, 'Paritybit', paritybit, 'Stopbit', stopbit, 'Gap', gap
                               char = 
                               symbol = 
                               databits = 
                       print 'Full Decoded Frame: ' + ordered + ' hex: ' + hexvalue
                       
                       print
                       print telegrambytes[0], ' Control byte' 
                       typeoftelegram = telegrambytes[0][0] + telegrambytes[0][1]
                       print typeoftelegram, '      ',
                       if typeoftelegram == '00':
                           print 'Extended Data Request'
                       elif typeoftelegram == '10':
                           print 'Data Request'
                       elif typeoftelegram == '11':
                           print 'Poll Data Request'
                       repeatedtelegram = telegrambytes[0][2]
                       print ' ', repeatedtelegram,'     ',
                       if repeatedtelegram == '1':
                           print 'First transmission'
                       elif repeatedtelegram == '0':
                           print 'Retransmission'
                       fixedone = telegrambytes[0][3]
                       print '  ', fixedone, '    ',
                       if fixedone == '1':
                           print 'Fixed 1 - OK'
                       elif fixedone == '0':
                           print 'Fixed 1 - Error'
                       telegrampriority = telegrambytes[0][4] + telegrambytes[0][5]
                       print '   ', telegrampriority, '  ',
                       if telegrampriority == '11':
                           print 'Priority - Low'
                       elif telegrampriority == '01':
                           print 'Priority - High'
                       elif telegrampriority == '10':
                           print 'Priority - Alarm'
                       elif telegrampriority == '00':
                           print 'Priority - System'
                       fixedzeros = telegrambytes[0][6] + telegrambytes[0][7]
                       print '     ', fixedzeros, ,
                       if fixedzeros == '00':
                           print 'Fixed 00 - OK'
                       else:
                           print 'Fixed 00 - Error'
                       
                       print    
                       print telegrambytes[1], ' Source address - first byte'
                       area = telegrambytes[1][0] + telegrambytes[1][1] + telegrambytes[1][2] + telegrambytes[1][3]
                       areai = int(area,2)
                       print area, '     Area:', areai
                       line = telegrambytes[1][4] + telegrambytes[1][5] + telegrambytes[1][6] + telegrambytes[1][7]
                       linei = int(line,2)
                       print '   ', line, ' Line:', linei
                       print telegrambytes[2], ' Source address - second byte'
                       device = telegrambytes[2]
                       devicei = int(device,2)
                       print device, ' Device:', devicei
                       
                       print
                       print telegrambytes[3], ' Destination address - first byte'
                       daf = telegrambytes[3][0]
                       print daf, '       ',
                       if daf == '0':
                           print 'Group address'
                       elif daf == '1':
                           print 'Physical address'
                       maingroup = telegrambytes[3][1] + telegrambytes[3][2] + telegrambytes[3][3] + telegrambytes[3][4]
                       maingroupi = int(maingroup,2)
                       print , maingroup, '    Main group:', maingroupi
                       middlegroup = telegrambytes[3][5] + telegrambytes[3][6] + telegrambytes[3][7]
                       middlegroupi = int(middlegroup,2)
                       print '    ', middlegroup, ' Middle group:', middlegroupi                   
                       print telegrambytes[4], ' Destination address - second byte'
                       subgroup = telegrambytes[4]
                       subgroupi = int(subgroup,2)
                       print subgroup, ' Subgroup:', subgroupi
                       print
                       print 'Telegram:', areai,  '.', linei, '.', devicei, '  ', maingroupi, '/', middlegroupi, '/', subgroupi
                       print
                   else:
                       print 'ACK / NOACK'
                   ordered = 
                   decoded = '0'
                   hexvalue = 
                   telegrambytes = []
               else:
                   num = (samplessincelast + 5) / 10
                   if num > 1:
                       for j in range(1,num):
                           decoded = decoded + '1'
                   decoded = decoded + '0'    
               lasti = i
   i = i + 1

f.close