Instructions were added to liberatro document site:
https://docs.libretro.com/guides/netplay-multiple-controllers/

@strohseph

I did the copy and paste from your entire list for the libretro cores.

It's kind of making a confusing mess of all things.

Is there a simple way to remove all of those symlinks?

I can use either PuTTy or WinSCP.

@mitu Thank you. That's all I needed to know.

@Daistaar said in Netplay questions: Can two Pi's connect directly via LAN?:

Would this allow, say full screen multi-player Mario Kart for each monitor? Would they still just see everything split?

That would require heavy hacking on the game roms themselves, while RetroArch's Netplay just uses the unmodified roms and spans the players' monitor & controller cables through the network, figuratively speaking.

@Efriim said in Error when starting netplay host:

@saccublenda
Perhaps there is the same setting somewhere within retroarch.

Indeed there is. Under Settings -> User -> Username (it sets the "netplay_nickname" in
retroarch.cfg). With this matching the hostname I can start the netplay host from retroarch menu.

It is a peculiar thing, I remember it working without configuration, I had a hostname so I don't really understand it.

Same here. I used to have a netplay nickname different from the hostname, and it didn't matter. Weird.

@mitu said in Can't seem to get Netplay to work:

@mikespie Please add more info about your system - https://retropie.org.uk/forum/topic/3/read-this-first.

The core means which emulator are you using for the running the game. You need to use the exact version of it and also the exact ROM on both systems. Since you're running a Megadrive rom, the core should be either lr-picodrive (I think this is the default) or lr-genesis-plus-gx (see the Megadrive docs).

Thank you for your response, sorry for not providing all info. Just from your post I was able to figure it out and have Netplay working / connecting now! However, it seems as though the controllers do not work in a lot of the games while on Netplay. I have tried using different emulators to no avail. An example is Street Fighter II for Genesis, Player 1 controller works fine, but player 2 controller doesn't work at all. Tried a keyboard as well, both which work fine not in Netplay.

My system is a CanaKit - https://amzn.to/2Taj5jf
PI 3 B+ w/ 2.5A power supply
RetroPie V 4.4.4 (skyscraper-pr6-v3)
Built from premade SD image on RetroPie website
I have a USB keyboard, mouse and controller hooked up to it
Controller is working great outside of Netplay, it's an "EasySMX 2.4G Wireless Controller" and also a Geeekpi SNES USB controller
Emulator is lr-genesis-plus-gx

Thanks again!

shot out of left field here, but did you ever end up figuring this out? same issue and the web is completely barren of references to the issue apart from yours lol

@hooperre said in Netplay with mupen64plus-auto?:

Have you used Netplay outside of a LAN type situation? I've heard it's optimized for LAN use and doesn't work well over the interwebs.

I played some Metal Slug on my RetroPie arcade cabinet (3B+) through Retroarch's Netplay. I was in the U.S. and he was in the U.K. playing on a hacked Switch console.

We had to make sure we both had the same Retroarch version, emulator (LR-MAME2003), and ROM. It may not work flawlessly over the Internet, but it seemed to work fine (given the situation). We ended up beating Metal Slug with a lot of virtual quarters. I think there may be some input lag depending on emulation demand.

@revlied

Please do not post a support request without first reading and following the advice in https://retropie.org.uk/forum/topic/3/read-this-first

Along with the information requested there, what part of the Netplay documentation seems outdated?

I run it directly via scripts:
(Host Coop)
#!/bin/bash
/opt/retropie/ports/zdoom/zdoom +set fullscreen 1 -host 2 -warp 01 -skill 2 -iwad /home/pi/RetroPie/roms/ports/doom/doom2.wad -file /home/pi/RetroPie/roms/ports/doom/mod.pk3
or
(Host Deathmatch)
#!/bin/bash
/opt/retropie/ports/zdoom/zdoom +set fullscreen 1 -host 2 -deathmatch......

or
(join)
#!/bin/bash
/opt/retropie/ports/zdoom/zdoom +set fullscreen 1 -iwad /home/pi/RetroPie/roms/ports/doom/doom2.wad -file /home/pi/RetroPie/roms/ports/doom/mod.pk3 -join 192.168.X.X

OR
Check out the Retropie Doom wiki, regarding mods. You could use the same commands above, but put it in /opt/retropie/configs/port/modname/emulators.cfg (that's what the "runcommand .sh " 0 Port" doom" stuff is pointing to...the "doom" directory in /opt/.../configs)

Edit:
(Here are some images I made to dress up the MP scripts)
https://imgur.com/a/C6GCc

Reference: https://zdoom.org/wiki/multiplayer

So the conclusion then, is that Netplay through lobbies really doesn't work or is not a supported feature in RetroPie, @mediamogul?

I'm experiencing exactly the same problem.
I hope someone has a solution.

@flxfit well we dont close threads since they help more than the original poster. But please share with us how it worked as so to benefit others.

@alanjds The original poster hasn't been active for 3 years and bumping 3 years old topic is not proper forum etiquette. I suggest you open a new topic if you have a specific support question - mentioning the info about your system, as detailed in https://retropie.org.uk/forum/topic/3/read-this-first. Thank you.

I added a few options and some AI bots.
@BuZz Any update about the binaries ?

Sorry for resurrecting this thread. Are there any news on the integration of this feature in Retropie? I wrote a post asking for directions here. It seems that I can host games just fine, but I am unable to join games from the room list, as I always get that "Failed to locate matching content by either CRC or filename." I downloaded the databases and scanned the content, but it seems that retroarch is still unable to find any cores and games from my collection.

PS: I tried following the instructions by @mediamogul , but the scripts /opt/retropie/configs/all/runcommand-onstart.sh and /opt/retropie/configs/all/runcommand-onendsh are not there anymore in the last version... Any ideas?

There has been an update to NetPlay in general that supports something called "Net Rooms" which would be similar to random match making. However it doesn't work on Retropie at the moment.

https://retropie.org.uk/forum/topic/7913/retroarch-1-4-1-netplay/17

I personally would love to see Retropie to link up with Fightcade https://www.fightcade.com/