Added some stuff

Config/DefaultEngine.ini

@@ -1,8 +1,8 @@
 
 
 [/Script/EngineSettings.GameMapsSettings]
-GameDefaultMap=/Engine/Maps/Templates/OpenWorld
+GameDefaultMap=/Game/Maps/GameStartupMap.GameStartupMap
-
+EditorStartupMap=/Game/Maps/GameStartupMap.GameStartupMap
 
 [/Script/HardwareTargeting.HardwareTargetingSettings]
 TargetedHardwareClass=Desktop
@@ -41,3 +41,17 @@ ConnectionType=USBOnly
 bUseManualIPAddress=False
 ManualIPAddress=
 
+[/Script/Engine.GameEngine]
++NetDriverDefinitions=(DefName="GameNetDriver",DriverClassName="OnlineSubsystemSteam.SteamNetDriver",DriverClassNameFallback="OnlineSubsystemUtils.IpNetDriver")
+
+[OnlineSubsystem]
+DefaultPlatformService=Steam
+
+[OnlineSubsystemSteam]
+bEnabled=true
+SteamDevAppId=480
+bInitServerOnClient=true
+
+[/Script/OnlineSubsystemSteam.SteamNetDriver]
+NetConnectionClassName="OnlineSubsystemSteam.SteamNetConnection"
+

Config/DefaultGame.ini

@@ -1,3 +1,11 @@
 
+
 [/Script/EngineSettings.GeneralProjectSettings]
 ProjectID=DD573C214B328A1AEDE15DA9E4FBD4B4
+
+[/Script/Engine.GameSession]
+MaxPlayers=100
+
+[/Script/UnrealEd.ProjectPackagingSettings]
++MapsToCook=(FilePath="/Game/Maps/Lobby")
++MapsToCook=(FilePath="/Game/Maps/GameStartupMap")

Plugins/MultiplayerSessions/Source/MultiplayerSessions/Private/Menu.cpp

@@ -7,10 +7,11 @@
 #include "OnlineSessionSettings.h"
 #include "OnlineSubsystem.h"
 
-void UMenu::MenuSetup(int32 NumberOfPublicConnections, FString TypeOfMatch)
+void UMenu::MenuSetup(int32 NumberOfPublicConnections, FString TypeOfMatch, FString LobbyPath)
 {
 	NumPublicConnections = NumberOfPublicConnections;
 	MatchType = TypeOfMatch;
+	PathToLobby = FString::Printf(TEXT("%s?listen"), *LobbyPath);
 	
 	AddToViewport();
 	SetVisibility(ESlateVisibility::Visible);
@@ -89,7 +90,7 @@ void UMenu::OnCreateSession(bool bWasSuccessful)
 		UWorld* World = GetWorld();
 		if (World)
 		{
-			World->ServerTravel(FString("/Game/ThirdPerson/Maps/Lobby?listen"));
+			World->ServerTravel(FString(PathToLobby));
 		}
 	}
 	else
@@ -102,6 +103,7 @@ void UMenu::OnCreateSession(bool bWasSuccessful)
 				FColor::Red,
 				FString(TEXT("Failed to create session!")));
 		}
+		HostButton->SetIsEnabled(true);
 	}
 }
 
@@ -122,6 +124,10 @@ void UMenu::OnFindSessions(const TArray<FOnlineSessionSearchResult>& SessionResu
 			return;
 		}
 	}
+	if (!bWasSuccessful || SessionResults.Num() == 0)
+	{
+		JoinButton->SetIsEnabled(true);
+	}
 }
 
 void UMenu::OnJoinSession(EOnJoinSessionCompleteResult::Type Result)
@@ -143,6 +149,11 @@ void UMenu::OnJoinSession(EOnJoinSessionCompleteResult::Type Result)
 			}
 		}
 	}
+
+	if (Result != EOnJoinSessionCompleteResult::Success)
+	{
+		JoinButton->SetIsEnabled(true);
+	}
 }
 
 void UMenu::OnDestroySession(bool bWasSuccessful)
@@ -155,6 +166,8 @@ void UMenu::OnStartSession(bool bWasSuccessful)
 
 void UMenu::HostButtonClicked()
 {
+	HostButton->SetIsEnabled(false);
+	
 	if (MultiplayerSessionsSubsystem)
 	{
 		MultiplayerSessionsSubsystem->CreateSession(NumPublicConnections, MatchType);
@@ -163,6 +176,8 @@ void UMenu::HostButtonClicked()
 
 void UMenu::JoinButtonClicked()
 {
+	JoinButton->SetIsEnabled(false);
+	
 	if (MultiplayerSessionsSubsystem)
 	{
 		MultiplayerSessionsSubsystem->FindSessions(10000);

Plugins/MultiplayerSessions/Source/MultiplayerSessions/Private/MultiplayerSessionsSubsystem.cpp

@@ -31,7 +31,11 @@ void UMultiplayerSessionsSubsystem::CreateSession(int32 NumPublicConnections, FS
 	auto ExistingSession = SessionInterface->GetNamedSession(NAME_GameSession);
 	if (ExistingSession != nullptr)
 	{
-		SessionInterface->DestroySession(NAME_GameSession);
+		bCreateSessionOnDestroy = true;
+		LastNumPublicConnections = NumPublicConnections;
+		LastMatchType = MatchType;
+
+		DestroySession();
 	}
 
 	// Store the delegate in a FDelegateHandle so we can later remove it from the delegate list
@@ -102,10 +106,36 @@ void UMultiplayerSessionsSubsystem::JoinSession(const FOnlineSessionSearchResult
 
 void UMultiplayerSessionsSubsystem::DestroySession()
 {
+	if (!SessionInterface.IsValid())
+	{
+		MultiplayerOnDestroySessionComplete.Broadcast(false);
+		return;
+	}
+
+	DestroySessionCompleteDelegateHandle = SessionInterface->AddOnDestroySessionCompleteDelegate_Handle(DestroySessionCompleteDelegate);
+	
+	if (!SessionInterface->DestroySession(NAME_GameSession))
+	{
+		SessionInterface->ClearOnDestroySessionCompleteDelegate_Handle(DestroySessionCompleteDelegateHandle);
+		MultiplayerOnDestroySessionComplete.Broadcast(false);
+	}
 }
 
 void UMultiplayerSessionsSubsystem::StartSession()
 {
+	if (!SessionInterface.IsValid())
+	{
+		return;
+	}
+
+	StartSessionCompleteDelegateHandle = SessionInterface->AddOnStartSessionCompleteDelegate_Handle(StartSessionCompleteDelegate);
+	
+	if (!SessionInterface->StartSession(NAME_GameSession))
+	{
+		SessionInterface->ClearOnStartSessionCompleteDelegate_Handle(StartSessionCompleteDelegateHandle);
+
+		MultiplayerOnStartSessionComplete.Broadcast(false);
+	}
 }
 
 void UMultiplayerSessionsSubsystem::OnCreateSessionComplete(FName SessionName, bool bWasSuccessful)
@@ -146,8 +176,26 @@ void UMultiplayerSessionsSubsystem::OnJoinSessionComplete(FName SessionName, EOn
 
 void UMultiplayerSessionsSubsystem::OnDestroySessionComplete(FName SessionName, bool bWasSuccessful)
 {
+	if (SessionInterface)
+	{
+		SessionInterface->ClearOnDestroySessionCompleteDelegate_Handle(DestroySessionCompleteDelegateHandle);
+	}
+
+	if (bWasSuccessful && bCreateSessionOnDestroy)
+	{
+		bCreateSessionOnDestroy = false;
+		CreateSession(LastNumPublicConnections, LastMatchType);
+	}
+
+	MultiplayerOnDestroySessionComplete.Broadcast(bWasSuccessful);
 }
 
 void UMultiplayerSessionsSubsystem::OnStartSessionComplete(FName SessionNAme, bool bWasSuccessful)
 {
+	if (SessionInterface)
+	{
+		SessionInterface->ClearOnStartSessionCompleteDelegate_Handle(StartSessionCompleteDelegateHandle);
+	}
+
+	MultiplayerOnStartSessionComplete.Broadcast(bWasSuccessful);
 }

Plugins/MultiplayerSessions/Source/MultiplayerSessions/Public/Menu.h

@@ -18,7 +18,7 @@ class MULTIPLAYERSESSIONS_API UMenu : public UUserWidget
 public:
 
 	UFUNCTION(BlueprintCallable)
-	void MenuSetup(int32 NumberOfPublicConnections = 4, FString TypeOfMatch = FString(TEXT("FreeForAll")));
+	void MenuSetup(int32 NumberOfPublicConnections = 4, FString TypeOfMatch = FString(TEXT("FreeForAll")), FString LobbyPath = FString(TEXT("/Game/ThirdPerson/Maps/Lobby")));
 
 protected:
 
@@ -58,4 +58,5 @@ private:
 
 	int32 NumPublicConnections {4};
 	FString MatchType {TEXT("FreeForAll")};
+	FString PathToLobby { TEXT("")};
 };

Plugins/MultiplayerSessions/Source/MultiplayerSessions/Public/MultiplayerSessionsSubsystem.h

@@ -78,4 +78,8 @@ private:
 	FDelegateHandle DestroySessionCompleteDelegateHandle;
 	FOnStartSessionCompleteDelegate StartSessionCompleteDelegate;
 	FDelegateHandle StartSessionCompleteDelegateHandle;
+
+	bool bCreateSessionOnDestroy { false };
+	int32 LastNumPublicConnections;
+	FString LastMatchType;
 };