• Online Subsystem
• Online Subsystem Steam
• Steam Socket

• Steamをターゲットとし、EOSは使わない
• リッスンサーバー
• UE5.5

[/Script/Engine.GameEngine]
!NetDriverDefinitions=ClearArray
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="/Script/SteamSockets.SteamSocketsNetDriver",DriverClassNameFallback="/Script/SteamSockets.SteamNetSocketsNetDriver")
; 公式Doc通りだと以下
; [/Script/Engine.GameEngine]
; +NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")
 
[OnlineSubsystem]
DefaultPlatformService=Steam
 
[OnlineSubsystemSteam]
bEnabled=true
SteamDevAppId=480
SteamAppId=480
; GameServerQueryPort=27015
bInitServerOnClient=true
bUsesPresence=true
bUseLobbiesIfAvailable=true
bUseSteamNetworking=true
bAllowP2PPacketRelay=true
 
[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection";

• Standalone Game で実行して Steamオーバーレイが出るが、セッションを作成できない
  • Play As Listen Server でプレイしていないか？