Sockets: add Listener::on_disconnect() hook

Common/Cpp/Sockets/AbstractClientSocket.h

@@ -35,6 +35,11 @@ class AbstractClientSocket{
 
         //  Called when the socket receives data from the server.
         virtual void on_receive_data(const void* data, size_t bytes){}
+
+        //  Called when an established connection is lost (the server closed
+        //  the connection or a socket error occurred). It is not called by
+        //  "close()".
+        virtual void on_disconnect(const std::string& error_message){}
     };
 
     void add_listener(Listener& listener){

SerialPrograms/Source/NintendoSwitch/Controllers/SysbotBase/SysbotBase_Connection.cpp

@@ -151,7 +151,7 @@ void TcpSysbotBase_Connection::thread_loop(){
 void TcpSysbotBase_Connection::on_connect_finished(const std::string& error_message){
     try{
         if (!error_message.empty()){
-            m_logger.log(m_connecting_message, COLOR_RED);
+            m_logger.log(m_connecting_message + " - " + error_message, COLOR_RED);
             set_status_line0(m_connecting_message, COLOR_RED);
             return;
         }
@@ -162,6 +162,12 @@ void TcpSysbotBase_Connection::on_connect_finished(const std::string& error_mess
         write_data("getVersion\r\n");
     }catch (...){}
 }
+void TcpSysbotBase_Connection::on_disconnect(const std::string& error_message){
+    try{
+        m_logger.log("sys-botbase disconnected: " + error_message, COLOR_RED);
+        set_status_line1("Disconnected: " + error_message, COLOR_RED);
+    }catch (...){}
+}
 void TcpSysbotBase_Connection::on_receive_data(const void* data, size_t bytes){
 //    cout << "on_receive_data(): " << std::string((const char*)data, bytes - 2) << endl;
 

SerialPrograms/Source/NintendoSwitch/Controllers/SysbotBase/SysbotBase_Connection.h

@@ -49,6 +49,7 @@ class TcpSysbotBase_Connection : public ControllerConnection, private ClientSock
 
     virtual void on_connect_finished(const std::string& error_message) override;
     virtual void on_receive_data(const void* data, size_t bytes) override;
+    virtual void on_disconnect(const std::string& error_message) override;
 
     void process_message(const std::string& message, WallClock timestamp);
     void set_mode(const std::string& sbb_version);