LUA: Can’t plot float values in IO Graph

Hi,

We have written a LUA postdissector that calculates a number of response time values. These are defined as floating point fields, e.g.

rte_art_F = ProtoField.float("transum.art","APDU Rsp Time")

The postdissector works fine but I can't get the Wireshark IO Graph facility to plot the values - I just get a flat line. I use the Y Axis Unit: Advanced option in IO Graph, choose Calc: MAX(*) and then add transum.art as the value to plot.

I've tried the same thing with Wireshark compiled dissector fields and these work fine.

Does IO Graph support LUA postdissector fields? Am I doing something wrong?

Thanks and regards...Paul

PS: The dissector can be downloaded from http://www.tribelabzero.com/resources