How to get Field value
https://osqa-ask.wireshark.org/questions/56249
Dissect payload data as IP packet
https://osqa-ask.wireshark.org/questions/22992
Debug print
1) Launch Wireshark via terminal
2) print message shown on terminal
http://notebook.kulchenko.com/zerobrane/debugging-wireshark-lua-scripts-with-zerobrane-studio
https://wiki.wireshark.org/Lua
https://github.com/Lekensteyn/wireguard-dissector