How to create trigger on (4) or more ENIP (UDP) protocol requests from a PLC to an AB842E absolute encoder with no responses or other packets from the AB842E to the PLC?

edit

How do you create a trigger on a sequence of (4) or more ENIP (UDP) protocol requests from a PLC to an AB842E absolute encoder with no UDP responses or other packets from the AB842E to the PLC within 50 milli-seconds? Also, how to create a rotating ring capture file of 2,500 packets that overwrites the beginning until this trigger event occurs. Also, would like 50 additional packets after the trigger event occurs then stops the capture.