Difference between revisions of "KNX contactless"

Revision as of 15:16, 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
   #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