Wireshark filter for cyclic messages

[markus.proeller () ifm com]

Hello list,

I have the following problem:
I'm capturing EtherNet/IP traffic with cyclic I/O messages. This means for 
instance, I start a conenction with a packet rate of 100ms.

I send a string, let's say 'test1' to the device and the device answers 
with 'test2'. I capture the following:

0 ms: -> test1
            <- test2
100ms: ->test1
                <- test2
200ms: ->test1
               <- test2
and so on... until I send a new command:
900ms: -> test3
               <- test4
1000ms: -> test3
                  <- test4

Is there a possibility to capture only the messages, where the message 
content is changing, like the following:
0 ms: ->test1
            <- test2
900ms: -> test3
               <- test4

I hope it got clear what I mean.

Thanks in advance

Markus

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