diff --git a/claralogConverter.py b/claralogConverter.py
index 930574f..0ac66a9 100644
--- a/claralogConverter.py
+++ b/claralogConverter.py
@@ -27,7 +27,7 @@ from helpers import combineValueAndMultiplier
 import json
 
 # The path where the script will search for pcap files:
-directory = 'local/pcaps_to_convert'
+directory = '../clara-logs'
 
 # stop the evaluation after this number of packets. Set to zero to have no limit.
 nLimitNumberOfPackets = -1
@@ -42,8 +42,13 @@ nLimitNumberOfPackets = -1
 def convertClaralogToTxt(inputFileName):
     global nLimitNumberOfPackets
     global directory
+    outputFileName = inputFileName + '.decoded.txt'
+    # todo: if output file exists
+    if (os.path.isfile(os.path.join(directory, outputFileName))):
+        print("output file " + outputFileName + " already exists. Nothing to do.")
+        return
     fileIn = open(inputFileName, 'r')
-    fileOut = open(inputFileName + '.decoded.txt', 'w')
+    fileOut = open(outputFileName, 'w')
     print("# generated by claralogConverter.py", file=fileOut)
     print("# https://github.com/uhi22/pyPLC", file=fileOut)
     fileOutValues = open(inputFileName + '.values.txt', 'w')
@@ -60,12 +65,13 @@ def convertClaralogToTxt(inputFileName):
         numberOfPackets+=1
         #print(packet)
         print(line.strip(), file=fileOut)
-        posTcpPayload = line.find(": 01 fe 80 01 00")
+        lineWithoutBlanks = line.replace(" ", "")
+        posTcpPayload = lineWithoutBlanks.find(":01fe800100")
         if posTcpPayload>0:
                 # we found the V2GTP header.
-                tcppayload = line[posTcpPayload + 2:] # everything until the end of the line is the data
-                # this gives a string of hex values, separated by " ", e.g. "01 fe 80 01"
-                s = tcppayload.replace(" ", "") # remove spaces
+                tcppayload = lineWithoutBlanks[posTcpPayload + 1:] # everything until the end of the line is the data
+                # this gives a string of hex values, separated by " ", e.g. "01fe8001"
+                s = tcppayload
                 if (s[0:8]=="01fe8001"):
                     # it is a V2GTP header with EXI content
                     strExi = s[16:] # remove V2GTP header (8 bytes, means 16 hex characters)