Libreswan developers can be found on the #libreswan IRC channel on Libera.Chat.

IRC works best when you’re able to remain online, and to do this you’ll need to install a local IRC client. The thing is, we may not be online when your comments are posted, and you may not be online when we’re ready to answer.

If you’re not able to hang around then another medium, such as e-mail, may be more effective.

There’s an old saying, Everything on the Internet Takes At Least A Week; for IRC give it 24-hours + weekends.