This is a test to reproduce undesirable behaviour in almost all (not OpenBGPd) BGP deamons by causing a zero window TCP window to happen.
This code is heavily modified https://github.com/cloudflare/fgbgp , the main binary is in the trigger-bug directory.
This was written for the investigation of: https://blog.benjojo.co.uk/post/bgp-stuck-routes-tcp-zero-window and the internet draft https://datatracker.ietf.org/doc/html/draft-spaghetti-idr-bgp-sendholdtimer