How to connect multiplayer on Metal Gear solid : peace walker on ppsspp mobile

[AdamN]

Depends on what kind of network you're using, whether you're playing over the internet (public adhoc server or VPN), or on LAN, also depends whether your internet capable of port-forwarding or not (ie. using mobile data, in the case of using public adhoc server).
For Android users there is also Port Offset issue (if you're not using the default value)
Since Multiplayer is still experimental, i recommend testing the latest dev build from https://buildbot.orphis.net/ppsspp/ if you have issue with older/release version.

Generally this guide already covers all kind of conditions https://github.com/hrydgard/ppsspp/wiki/...ith-PPSSPP

If you still have issue, you can ask players at PPSSPP Discord Server (channel #Multiplayer) https://discord.com/invite/5NJB6dD
People there have experience playing various games, and if they're online you can also ask them to try playing with you to test your configuration.