Initiate server (+Basic connection)

client/App.config

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+	<appSettings>
+		<add key="SERVER_IP" value="localhost"/>
+		<add key="PORT" value="25565"/>
+		<add key="PSWD" value="password"/>
+	</appSettings>
+</configuration>

client/Game1.cs

@@ -1,10 +1,19 @@
-using Microsoft.Xna.Framework;
+using LiteNetLib;
+using LiteNetLib.Utils;
+using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Graphics;
+using System;
+using System.Collections.Generic;
 
 namespace client
 {
     public class Game1 : Game
     {
+        // Network
+        EventBasedNetListener listener = new();
+        NetManager client;
+        NetPeer server;
+
         // Game instances
         private Player pl1;
         private Player pl2;
@@ -23,10 +32,32 @@ namespace client
             _graphics = new GraphicsDeviceManager(this);
             Content.RootDirectory = "Content";
             IsMouseVisible = true;
+
+            Dictionary<string, string> settings = Lib.ReadAllSettings();
+            if (!settings.ContainsKey("SERVER_IP") || (settings.ContainsKey("SERVER_IP") && Lib.ReadSetting("SERVER_IP") == null))
+            {
+                Console.Error.WriteLine("Server IP missing in config file!");
+            } else if (!settings.ContainsKey("PORT") || (settings.ContainsKey("PORT") && Lib.ReadSetting("PORT") == null))
+            {
+                Console.Error.WriteLine("Port missing in config file!");
+            } else if (!settings.ContainsKey("PSWD") || (settings.ContainsKey("PSWD") && Lib.ReadSetting("PSWD") == null))
+            {
+                Console.Error.WriteLine("Server password missing in config file!");
+            }
         }
 
         protected override void Initialize()
         {
+            // Network
+            client = new NetManager(listener);
+            client.Start();
+            server = client.Connect(Lib.ReadSetting("SERVER_IP"), int.Parse(Lib.ReadSetting("PORT")), Lib.ReadSetting("PSWD"));
+            if (server == null)
+            {
+                // TODO: Replace by a error message :)
+                Exit();
+            }
+
             // Window
             Window.Title = "Pong";
 

client/Lib/Lib.cs

@@ -0,0 +1,78 @@
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace client
+{
+    public class Lib
+    {
+        public static Dictionary<string, string> ReadAllSettings()
+        {
+            Dictionary<string, string> settings = new();
+            try
+            {
+                var appSettings = ConfigurationManager.AppSettings;
+
+                if (appSettings.Count == 0)
+                {
+                    Console.Error.WriteLine("AppSettings is empty.");
+                    return settings;
+                }
+                else
+                {
+                    foreach (var key in appSettings.AllKeys)
+                    {
+                        settings.Add(key, appSettings[key]);
+                    }
+                }
+                return settings;
+            }
+            catch (ConfigurationErrorsException)
+            {
+                Console.Error.WriteLine("Error reading app settings");
+                return settings;
+            }
+        }
+
+        public static string? ReadSetting(string key)
+        {
+            try
+            {
+                var appSettings = ConfigurationManager.AppSettings;
+                string? result = appSettings[key] ?? null;
+                return result;
+            }
+            catch (ConfigurationErrorsException)
+            {
+                Console.Error.WriteLine("Error reading app settings");
+                return null;
+            }
+        }
+
+        public static void AddUpdateAppSettings(string key, string value)
+        {
+            try
+            {
+                var configFile = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
+                var settings = configFile.AppSettings.Settings;
+                if (settings[key] == null)
+                {
+                    settings.Add(key, value);
+                }
+                else
+                {
+                    settings[key].Value = value;
+                }
+                configFile.Save(ConfigurationSaveMode.Modified);
+                ConfigurationManager.RefreshSection(configFile.AppSettings.SectionInformation.Name);
+            }
+            catch (ConfigurationErrorsException)
+            {
+                Console.Error.WriteLine("Error writing app settings");
+            }
+        }
+    }
+}

client/client.csproj

@@ -19,6 +19,7 @@
     <EmbeddedResource Include="Icon.bmp" />
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="LiteNetLib" Version="0.9.5.2" />
     <PackageReference Include="MonoGame.Extended" Version="3.8.0" />
     <PackageReference Include="MonoGame.Framework.DesktopGL" Version="3.8.1.303" />
     <PackageReference Include="MonoGame.Content.Builder.Task" Version="3.8.1.303" />