Question on concrete use #4

Hey,

nice implementation, so first of all thank you for great work!
I have little experience with realtime communication so far, so I'd like to ask a question about the concrete usage:

How would I do a NAT punchthrough if the server/host is already running?
For example, because a client wants to reconnect, or a third one wants to join later?
Is this possible, and if so, how would I achieve this with MLAPI and it's transports?

Thanks!