feat: Implementing Matchmaking

[KiaArmani]

Goal: The deployment example should include usage of the Redpoint Games Matchmaking plugin, allowing players to be grouped into matches.

Bonus: Support for parties to join together.

[KiaArmani]

Currently running into an issue where the client wants to talk to the matchmaking beacon, but the server does not respond. Think it might have to do with the server switching maps after launch too fast, not giving the beacon a chance to be talked to.

Either:

• Remove code from Lyra that makes it look for an experience and swap to that as dedicated server.
• Move logic into GameInstance.

[KiaArmani]

Yeah, turns out that's the issue. Need to add some more metadata to the server so it knows what to do once the players are there.

• Add support for gamemode / map via command-line args.
• Switch to intended experience once "OnMatchReadyToStart" is called.

[KiaArmani]

Got parsing in. For some reason the server immediately travels to that map though. Already disabled parsing in HandleMatchAssignmentIfNotExpectingOne (LyraGameMode.cpp), but there seems to be more that happens. More investigation needed.

[KiaArmani]

Made some significant changes due to new discoveries:

• Seems (for now) the client will always attempt to travel to the map the server started with (I guess I am just not parsing the correct information at the moment)
• Both client & server need to know which map and experience to launch (i.e. LyraServer.exe -server -log L_Expanse -Experience=B_ShooterGame_Elimination).
• Session creation triggers a server travel.

So the current setup is as followed:

• Place Matchmaking Beacon in played level instead of having an server entry level that has it.
• Created BPC_DedicatedServerInit which handles the following:
  • OnBeginPlay
    • Extract Experience from cmd args.
    • Check if named session already exists and only create session if not.
    • Advertise GAMEMODE (i.e. B_ShooterGame_Elimination) and MAPNAME (i.e. L_Expanse) via online services.
    • Find Beacon actor and Bind "On Match Ready to Start" event (called when all players of the match have connected)
  • OnMatchReadyToStart
    • Change Phase to Phase Playing.

So, what works now? Client can press Quick play (proper matchmaking with other players atm failing due to a bug, currently allowing partial matches to get the matchmaker to eventually give up and connect you to an available server anyway), get a server assigned (gets reserved and removed from pool of available servers) and successfully connects to the gameserver.

Todos:

• Get actual matchmaking with multiple players working.
• Fix match starting before client can actually see anything in the match. (the OnMatchReadyToStart event gets called too early, the match is already 7-8 seconds in progress once the world has loaded in)

[KiaArmani]

Get actual matchmaking with multiple players working.

Works now. Cause was a user error on my end, had the 2nd user authed for the wrong application in EOS.