[Networking] Steam OnlineSubsystem: Can't find or join session if 2 people in lobby

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1

So I’m trying integrate the steam subsystem to support online play with multiple people. I got it working so far and 2 people (the host and 1 client) are able to join. But when a third person tries to join, it is not able to find the online session anymore. I’m not sure why this is happening. I made it a lobby matchmaking system by enabling presence. I think the issue is with finding a match. I’ll list some of the relevant code below.

So the issue is not with not enabled steam or something because it works perfectly fine with 2 people. Its just with 2+ people, it doesn’t. I tried this same logic with the NULL subsystem (so LAN) and it works fine with any amount of people joining. Just for steam, it doesn’t work (limit of 2).

in GameInstance.cpp


const static FName SESSION_NAME = TEXT("GameSession");
const static FName SERVER_SETTINGS = TEXT("ServerName");


void UTheGameInstance::CreateSession(FString DesiredServerName)
{
    FOnlineSessionSettings SessionSettings;

    SessionSettings.bIsLANMatch = false;
    SessionSettings.NumPublicConnections = 6;
    SessionSettings.bShouldAdvertise = true;
    SessionSettings.bUsesPresence = true;
    SessionSettings.Set(SERVER_SETTINGS, DesiredServerName, EOnlineDataAdvertisementType::ViaOnlineServiceAndPing);

    SessionInterface->CreateSession(0, SESSION_NAME, SessionSettings);
}

void UTheGameInstance::FindGames()
{
    SessionSearch = MakeShareable(new FOnlineSessionSearch());

    SessionSearch->MaxSearchResults = 100;
    SessionSearch->QuerySettings.Set(SEARCH_PRESENCE, true, EOnlineComparisonOp::Equals);
    SessionInterface->FindSessions(0, SessionSearch.ToSharedRef());
}
2

I sort of fixed the issue by setting bAllowJoinInProgress to true for SessionSettings. But its not working right because the clients can join during mid-game now instead of just the lobby and it seems like its not counting those connections. With the NULL subsystem, I had it working where any amount of people can join the lobby until the max capacity and when everyone travels from the lobby to the main map, the session gets locked out (which I do by calling the function StartSession). So no one can see the session once everyone is in the main map.

I just don’t know why this is not working for Steam with more than 2 people? There is barely any documentation on this.

3

Did u solve this problem?

4

I’m having the exact same issue. Did you find a solution?