The Warriors AdHoc

[TemporaryPSP]

1P: Player 1 (network host, not necessarily the game host)
2P: Player 2

What happens?

Prior to PR #13967 build, no matter which player hosts the game, it will never start. Since it's merged with 1.11, it should be fixed but no. If 1P hosts the game, 2P will be disconnected even if 1P hasn't started the game. If 2P hosts the game, 1P won't be disconnected from the lobby, but the game won't start.

What should happen?

The game should start normally, even if 2P hosts it. (tested with PR build with multiple instances/localhost)

PPSSPP version?

Tested with 1.10, 1.10.3-1628-g65af16bcb (PR build), 1.11.

It should work with the PR build at least with multiple instances.
If not then I think it's one of the games that are affected by I/O timing or force real clock sync in system options (or fast memory but i doubt that).
I made a github wiki page that should help troubleshoot issues here : https://github.com/hrydgard/ppsspp/wiki/How-to-play-multiplayer-games-with-PPSSPP

[anr2me]

Hmm.. i can't reproduce this issue on localhost, it always works on my side, but i'm running both instance from the same PPSSPP folder.

May i know which mission did you choose? i'm testing it on the Quick Rumble -> 1on1 & Battle Royale & Survival & Race

Are you using different folder for each instance? if you are, make sure both PPSSPP exe are excluded from firewall

What Port Offset value are you using? if it's under 1024 you may need to run PPSSPP as admin (i'm using 1500 for this test)

Are you using any cheats?

PS:
I'm using the default settings for Fast Memory (enabled), I/O on Thread (enabled), I/O Timing method (Fast), Force real clock sync (disabled)

[TemporaryPSP]

It works with localhost (1.11) but I tried 2 devices and it didn't work. (PC & Mobile)

Both instances are from the same folder, excluded from firewall, 5000 port offset, no cheats, with the same system settings.

[anr2me]

Okay i'm able to reproduce it,
when Android is the host it is working fine, but when PC is the host it will loop trying to connect to android but always failed with EAGAIN/EWOULDBLOCK error because it's non-blocking connect and the game will immediately close the socket and try to connect again with new socket, thus the connect attempt never successful as it's too soon to close the socket.

Since the game didn't explicitly using PtpConnect to connect, but expecting PtpOpen to return a connected socket and immediately send data using PtpSend, i'll try to add some delays before returning from PtpOpen to give chance for the internal connect to get connected.

[anr2me]

@TemporaryPSP You can try this test build while waiting for PR #14117 to be merged

Android (ARMv7): https://www.dropbox.com/s/b41bm43mtn1gpnn/PPSSPP_1.11-testbuild_ARMv7.apk?dl=0
Win32/x64: https://www.dropbox.com/s/2t3mtdhb0f045cn/PPSSPP_1.11-testbuild_Win32x64.zip?dl=0

[TemporaryPSP]

I've tested mobile to mobile and localhost multiple times, but mobile to PC still doesn't work. Take a look at this video. (Be careful, flickering AVI dump, sorry)

The_Warriors_AdHoc.mp4

[anr2me]

@TemporaryPSP Could you redownload the test builds, i've updated it yesterday to include the fix for communication issue between Android vs PC due to detecting an incorrect port. (the fix was intended for MGS:PW but other games could have similar issue too)

I've tested those test builds on The Warriors and found no problem playing on LAN Android vs PC using built-in AdhocServer on PC side, tested both Android as host and PC as host all working fine.
You are using built-in AdhocServer for your test, right?

Edit: Nevermind, you're testing it on the Story and it did have problem with story. (i didn't know the story have multiplayer support too, i thought it was for single player only)

Looks like AdhocMatching issue, and AdhocMatching issue will probably takes some time to be fixed, since a lot of things need to be changed and each syscall's behavior need to be tested on a homebrew too (currently our AdhocMatching implementation works is a bit different than how pspnet_adhoc_matching.prx works), also all games that use AdhocMatching will need to be retested since the timings will be affected too.

[anr2me]

Looks like multiplayer on the Story also works if you waited a bit longer(about 3-4 seconds) before joining, wait a few seconds after you see the game room before joining, and after joined wait a few seconds before starting the mission.

Based on your video, it seems you're progressing too fast.