It announces presence and finds FIPS peers on Nostr. Then it uses FIPS to route packets to the recipient device npub, directly or through fips peers.
https://github.com/jmcorgan/fips
https://git.iris.to/#/npub1xdhnr9mrv47kkrn95k6cwecearydeh8e895990n3acntwvmgk2dsdeeycm/nostr-vpn
