How to connect via Ip from a phone (client) to a computer (server)?

Question

Android

In general, this is the problem, I have a client and a server on the computer, it works like a chat (written in C ++), now I found such a thing "Xamarin" that allows you to compile code from c # to the android platform.
I set everything up and started trying to connect from the phone to the server on the computer, the phone is connected to Wi-Fi like the computer. When I enter IPs, the phone gives an error connecting to the server.
I don't know how to make it work properly, maybe someone can help.
Here is the c# code (client on phone):

static void TryConnect(int port)
            {
                
            // Буфер для входящих данных
            byte[] bytes = new byte[50];

            // Соединяемся с удаленным устройством

            // Устанавливаем удаленную точку для сокета
            IPHostEntry ipHost = Dns.GetHostEntry("localhost");
            IPAddress ipAddr = ipHost.AddressList[0];
            IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, port);

            Socket sender = new Socket(ipAddr.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
     // Соединяем сокет с удаленной точкой
            sender.Connect(ipEndPoint);
            string message = "Hello dima";
            byte[] msg = Encoding.UTF8.GetBytes(message);
            int bytesSent = sender.Send(msg);

            ////
            }

and the server code on the computer:

//---- Build address structure to bind to socket.--------  
         memset(&channel, 0, sizeof(channel));// zerochannel 
         channel.sin_family = AF_INET;
         channel.sin_addr.s_addr = inet_addr(adrr);  //htonl(INADDR_ANY)
         channel.sin_port = htons(SERVER_PORT);
         //--------------------------------------------------------


         // ---- create SOCKET--------------------------------------
         s = socket(PF_INET,  SOCK_STREAM, IPPROTO_TCP);
         if (s < 0) {
           textBox1->Text = "socket error :" + System::Convert::ToString(WSAGetLastError());
           WSACleanup();
           timer = false;
         }

         setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof(on));
         //---------------------------------------------------------

         //---- BIND socket ----------------------------------------
         b = bind(s, (struct sockaddr *) &channel, sizeof(channel));
         if (b < 0) {
           textBox1->Text = "bind error :" + System::Convert::ToString(WSAGetLastError());
           WSACleanup();
           timer = false;
         }
         //----------------------------------------------------------

         //---- LISTEN socket ----------------------------------------
         l = listen(s, QUEUE_SIZE);                 // specify queue size 
         if (l < 0) {

           textBox1->Text = "listen error %ld" + System::Convert::ToString(WSAGetLastError());
           WSACleanup();
           timer = false;
         }

         //-----------------------------------------------------------


         //---- ACCEPT connection ------------------------------------

         sa = accept(s, 0, 0);                  // block for connection request  
         if (sa < 0) {

           textBox1->Text = "accept error " + System::Convert::ToString(WSAGetLastError());
           WSACleanup();
           timer = false;
         }
         else {

           textBox1->Text = "connection accepted";
         }

Answer 1

You can close the topic, I found a solution. It took the night for everything, the problem was solved in this way:

TcpClient client; // Creates a TCP Client
           client = new TcpClient("192.168.0.103 ", 11000);

everything is simple and clear now)