Traversal: Notify user of TTL to be used

Source/Core/Common/TraversalClient.cpp

@@ -388,6 +388,7 @@ void TraversalClient::HandleTraversalTest()
     {
       // success, we can stop now
       m_ttlReady = true;
+      m_Client->OnTtlDetermined(m_ttl);
     }
     else
     {

Source/Core/Common/TraversalClient.h

@@ -24,6 +24,7 @@ public:
   virtual void OnTraversalStateChanged() = 0;
   virtual void OnConnectReady(ENetAddress addr) = 0;
   virtual void OnConnectFailed(TraversalConnectFailedReason reason) = 0;
+  virtual void OnTtlDetermined(u8 ttl) = 0;
 };
 
 class TraversalClient

Source/Core/Core/NetPlayClient.h

@@ -72,6 +72,7 @@ public:
   virtual void OnTraversalStateChanged(Common::TraversalClient::State state) = 0;
   virtual void OnGameStartAborted() = 0;
   virtual void OnGolferChanged(bool is_golfer, const std::string& golfer_name) = 0;
+  virtual void OnTtlDetermined(u8 ttl) = 0;
 
   virtual bool IsRecording() = 0;
   virtual std::shared_ptr<const UICommon::GameFile>
@@ -148,6 +149,7 @@ public:
   void OnTraversalStateChanged() override;
   void OnConnectReady(ENetAddress addr) override;
   void OnConnectFailed(Common::TraversalConnectFailedReason reason) override;
+  void OnTtlDetermined(u8 ttl) override {}
 
   bool IsFirstInGamePad(int ingame_pad) const;
   int NumLocalPads() const;

Source/Core/Core/NetPlayServer.cpp

@@ -1265,6 +1265,11 @@ void NetPlayServer::OnTraversalStateChanged()
   m_dialog->OnTraversalStateChanged(state);
 }
 
+void NetPlayServer::OnTtlDetermined(u8 ttl)
+{
+  m_dialog->OnTtlDetermined(ttl);
+}
+
 // called from ---GUI--- thread
 void NetPlayServer::SendChatMessage(const std::string& msg)
 {

Source/Core/Core/NetPlayServer.h

@@ -144,6 +144,7 @@ private:
   void OnTraversalStateChanged() override;
   void OnConnectReady(ENetAddress) override {}
   void OnConnectFailed(Common::TraversalConnectFailedReason) override {}
+  void OnTtlDetermined(u8 ttl) override;
   void UpdatePadMapping();
   void UpdateGBAConfig();
   void UpdateWiimoteMapping();

Source/Core/DolphinQt/NetPlay/NetPlayDialog.cpp

@@ -1037,6 +1037,11 @@ void NetPlayDialog::OnGolferChanged(const bool is_golfer, const std::string& gol
     DisplayMessage(tr("%1 is now golfing").arg(QString::fromStdString(golfer_name)), "");
 }
 
+void NetPlayDialog::OnTtlDetermined(u8 ttl)
+{
+  DisplayMessage(tr("Using TTL %1 for probe packet").arg(QString::number(ttl)), "");
+}
+
 bool NetPlayDialog::IsRecording()
 {
   std::optional<bool> is_recording = RunOnObject(m_record_input_action, &QAction::isChecked);

Source/Core/DolphinQt/NetPlay/NetPlayDialog.h

@@ -71,6 +71,7 @@ public:
   void OnTraversalStateChanged(Common::TraversalClient::State state) override;
   void OnGameStartAborted() override;
   void OnGolferChanged(bool is_golfer, const std::string& golfer_name) override;
+  void OnTtlDetermined(u8 ttl) override;
 
   void OnIndexAdded(bool success, const std::string error) override;
   void OnIndexRefreshFailed(const std::string error) override;