NED fieldname in cPatternMatcher is very confusing to use with units

[edlongman]

Platform

• OMNeT++ version: 5.4
• OS: Windows

Describe the bug
When trying to filter packets for the INET Visualizer I applied a filter to the totalLength field to only show if the packet had a certain number of bytes (in it's totalLength field)

• I tried: networkRouteVisualizer.packetFilter = "totalLength({1..})"; But it needed the unit.
• So I tried: networkRouteVisualizer.packetFilter = "totalLength({1..}B)";
• After deep debugging into cmatchexpression I realised that the field with a unit was evaluating as 24 B, so I added a space: networkRouteVisualizer.packetFilter = "totalLength({1..} B)";
• Still didn't work because the space got stripped! I had to resort to networkRouteVisualizer.packetFilter = "totalLength({1..}*B)";

This whole thing was really confusing and I could only solve it by digging deep into the omnetpp core, which is ok for me, but expects a huge amount of a non c++ competant user. Ideally I wouldn't have to do it either!

To Reproduce
I can provide MWE if required.

[avarga]

Thanks for the feedback! Actually, we also sort of knew about these kinds of issues, and we started working on a better solution just a couple of days ago. If you'd like a test drive, please ask back next week or so.