nvpn-4.0.18 is not a library.
nvpn
CLI and daemon for Nostr VPN private mesh networks.
The nvpn binary can initialize Nostr VPN configuration, run the VPN session
foreground or as a daemon, install/manage the system service on supported
platforms, and perform update checks for release binaries.
Install from crates.io:
Run nvpn --help for the current command set.