Conversation tracking in LUA dissector

[Helge Kruse <Helge.Kruse () gmx net>]

I have a protocol with several versions. Dependent on the negotiated
protocol version at begin of the session the structure of the messages
is different. While writing C++ dissectors I used the conversation
member of pktinfo. How can I implement this in a LUA dissector?

Corresponding to
https://www.wireshark.org/docs/wsdg_html/#lua_class_Pinfo the pktinfo
should have a member conversation. But when I try to access it I get an
error:
"No such 'conversation' method/field for object type 'Pinfo'

It looks like there is already an open bug:
 https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15396

Do you have any other idea how to save information of a session?

Best regards,
Helge
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