Server

Server/Client.cs

@@ -1,10 +1,65 @@
 using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Net;
+using System.Net.Sockets;
 using System.Text;
+using Newtonsoft;
+using Newtonsoft.Json;
 
 namespace Server
 {
     class Client
     {
+        private Communication communication;
+        private TcpClient tcpClient;
+        private NetworkStream stream;
+        private byte[] buffer = new byte[1024];
+        private byte[] totalBuffer = new byte[1024];
+
+        public string Username { get; set; }
+
+        public Client(Communication communication, TcpClient tcpClient)
+        {
+            this.communication = communication;
+            this.tcpClient = tcpClient;
+            this.stream = this.tcpClient.GetStream();
+            stream.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(OnRead), null);
+        }
+
+        private void OnRead(IAsyncResult ar)
+        {
+            try
+            {
+                int receivedBytes = stream.EndRead(ar);
+              
+            }
+            catch (IOException)
+            {
+                communication.Disconnect(this);
+                return;
+            }
+
+            int counter = 0;
+
+            while (buffer.Length > counter)
+            {
+                byte[] lenghtBytes = new byte[4];
+                Array.Copy(buffer, counter, lenghtBytes, 0, 4);
+                int length = Convert.ToInt32(lenghtBytes);
+                byte[] packet = new byte[length];
+                Array.Copy(buffer, counter + 4, packet, 0, length-4);
+                HandleData(Encoding.Default.GetString(packet));
+                counter += length;
+            }
+
+            stream.BeginRead(buffer, 0, buffer.Length, new AsyncCallback(OnRead), null);
+        }
+
+        private void HandleData(string packet)
+        {
+            Console.WriteLine(packet);
+            JsonConvert.DeserializeObject(packet);
+        }
     }
 }

Server/Comms.cs

@@ -1,10 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
-
-namespace Server
-{
-    class Comms
-    {
-    }
-}

Server/Communication.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Collections.Generic;
+using System.IO.Pipes;
+using System.Net.Sockets;
+using System.Text;
+
+namespace Server
+{
+    class Communication
+    {
+        private TcpListener listener;
+        private List<Client> clients;
+
+        public Communication(TcpListener listener)
+        {
+            this.listener = listener;
+            this.clients = new List<Client>();
+        }
+
+        public void Start()
+        {
+            listener.Start();
+            listener.BeginAcceptTcpClient(new AsyncCallback(OnConnect), null);
+        }
+
+        private void OnConnect(IAsyncResult ar)
+        {
+            var tcpClient = listener.EndAcceptTcpClient(ar);
+            Console.WriteLine($"Client connected from {tcpClient.Client.RemoteEndPoint}");
+            clients.Add(new Client(this, tcpClient));
+            listener.BeginAcceptTcpClient(new AsyncCallback(OnConnect), null);
+        }
+
+        internal void Disconnect(Client client)
+        {
+            clients.Remove(client);
+        }
+    }
+}

Server/Program.cs

@@ -1,4 +1,6 @@
 using System;
+using System.Net;
+using System.Net.Sockets;
 
 namespace Server
 {
@@ -6,7 +8,13 @@ namespace Server
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello World!");
+            Communication communication = new Communication(new TcpListener(IPAddress.Any, 5555));
+            communication.Start();
+
+            while (true)
+            {
+
+            }
         }
     }
 }

Server/Server.csproj

@@ -5,4 +5,8 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
+  </ItemGroup>
+
 </Project>