Nayuta, a team currently developing a new Lightning Network implementation called ptarmigan, announced the release of a wireshark plugin for the Lightning Network (BOLT) protocol. The plugin is hosted here.
It’s alpha version, but it can decode some BOLT message. Currently, this software works for Nayuta’s implementation(ptarmigan) and Éclair. When ptarmigan is compiled with some option, it write out key information file. This Wireshark plug-in decode packet using that file. When you use Éclair, this software parse log file.