Can't find session from dedicated server

Development Programming & Scripting Multiplayer & Networking
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1

Hi,
I can’t find session using dedicated server and client. I am using two computers and two steam accounts. Server computer has all ports open and public ip. Below are my configs. I am using AppId for my steam product, not default 480. Engine is 4.26 and I am using new SteamSockets subsystem. I have tried multiple combinations of flags with no luck. Well I do not want to connect directly to dedicated server, but to properly discover sessions as engine does not support to get sessions from ip. Of course for LAN everything works perfectly, so cpp functions are valid, but this is not what I want.

DefaultEngine.ini for client and server are the same, shoud they be different?

[URL]
GameName=Mythic
Port=7777

[OnlineSubsystemSteam]
SteamAppId=XXX
SteamDevAppId=XXX
bEnabled=True
bVACEnabled=True
GameServerQueryPort=27015
GameVersion=1.0.0.0
bUseSteamNetworking=True ;//NOT SURE OF THIS FLAG
bInitServerOnClient=false ;//NOT SURE OF THIS FLAG

[/Script/Engine.Engine]
!NetDriverDefinitions=ClearArray
+NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="SteamSockets.SteamSocketsNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")

[/Script/OnlineSubsystemSteam.SteamNetDriver]
NetConnectionClassName="SteamSockets.SteamSocketsNetConnection"

Function for creating session:

void UMysticGameInstance::CreateServer(FString ServerName, FString HostName)
{
	UE_LOG(LogMysticInstance, Warning, TEXT("Create Server..."));

	FOnlineSessionSettings SessionSettings;	
	SessionSettings.bShouldAdvertise = true;
 	SessionSettings.bAllowJoinInProgress = true;
 	SessionSettings.bAllowJoinViaPresence = true;
 	SessionSettings.bIsDedicated = true;
 	SessionSettings.bShouldAdvertise = true;
 	SessionSettings.bAllowInvites = true;
	SessionSettings.NumPublicConnections = 4;

	MyDebugInfo();
	
	SessionSettings.Set(FName("SERVER_NAME_KEY"), ServerName, EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);
	SessionSettings.Set(FName("SERVER_HOSTNAME_KEY"), HostName, EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);
	
	SessionInterface->CreateSession(0, GlobalSessionName, SessionSettings);
}

Function for searching session:

void UMysticGameInstance::FindSessions()
{
	SessionSearch = MakeShared<FOnlineSessionSearch>();	
	SessionSearch->MaxSearchResults = 50;
	SessionSearch->bIsLanQuery = false;
	SessionSearch->TimeoutInSeconds = 10;

	//this does not matter if it is turned on or off
	SessionSearch->QuerySettings.Set(SEARCH_DEDICATED_ONLY, true, EOnlineComparisonOp::Equals);

	SessionInterface->FindSessions(0, SessionSearch.ToSharedRef());
}

What the hell am I doing worng?

2

OK, I found solution.

In this function void FOnlineAsyncTaskSteamFindServerBase::Tick() in file OnlineSessionAsyncServerSteam.cpp there is called CreateQuery which creates BAD filter because it can not correctly read DEFINITIONS from the top of the file which is actually mentioned here Online Subsystem Steam | Unreal Engine 4.27 Documentation in the NOTE of section Server Details.

But even if you put all those things into targets this still do not work (only for server is ok), so you have to manually overwrite definitions from top of the OnlineSessionAsyncServerSteam.cpp file.

ENJOY!