You don't have to change anything from your router if it already works. You just need to enable ssl in knots settings (change to 1), then add an admin user and set its password. Then restart the server. After that your server can be accessed with https://localhost:1978 using the user/password you made. But then you need to add some custom packages to your phone for Knots to work with the server. If you can come to irc, I can help you set that up.