Can't see my buddy on my own AdhocServer

[Adhenovan]

Have your port all open on the server side is only halfway to host the adhocserver over internet.
Adhoc server is only the middleware to do operation code like matching, login, chatting and such.

the game itself do P2P connection on its own. that means All client must open all the port or port that games and server needed to be able communicate to other client with same games.

the other problem running it over internet is NAT , Firewall, closed port on every client that connect to adhocserver,
even adhoc server machine itself open all port the client is not always able to open all port needed by games, or the client behind a NAT , blocked by firewall etc that intterupt / block the connection.

the provided solution for blocked client connection is enable DMZ which is not available on every router or people playing using cellular data (GSM connection)

Additionally to LunaMoo comment UPNP support itself only help a bit because pro adhoc server code now is still using IP to connect each client with same games. some one need to rework on that server and use MAC Address instead. with the current implementation only 1 client can connect to the server using 1 public ip its a another critical problem that need to solve by implement tunneling feature into PPSSPP that tunnel port used by games to a single port and then forward it.

All above problem is easily solved by vpn because vpn assign ip to the client and do LAN over Internet.which solve NAT problem, Closed Port problem between client and IP problem.