diff --git a/Client/Client.cs b/Client/Client.cs
index 6ba9b16..71e8c43 100644
--- a/Client/Client.cs
+++ b/Client/Client.cs
@@ -4,9 +4,11 @@ using System.Collections.Generic;
 using System.Diagnostics;
 using System.Net.Sockets;
 using System.Text;
+using static SharedClientServer.JSONConvert;
 
 namespace Client
 {
+    public delegate void OnLobbyCreated(int id);
     class Client : ObservableObject
     {
         private TcpClient tcpClient;
@@ -18,6 +20,11 @@ namespace Client
         public bool Connected = false;
         private string username;
         public Callback OnSuccessfullConnect;
+        public Callback OnLobbiesListReceived;
+        public Callback OnLobbyJoinSuccess;
+        public Callback OnLobbiesReceivedAndWaitingForHost;
+        public OnLobbyCreated OnLobbyCreated;
+        public Lobby[] Lobbies { get; set; }
 
         public Client(string username)
         {
@@ -70,9 +77,9 @@ namespace Client
 
         private void handleData(byte[] message)
         {
-            byte id = message[0];
-            byte[] payload = new byte[message.Length - 1];
-            Array.Copy(message, 1, payload, 0, message.Length - 1);
+            byte id = message[4];
+            byte[] payload = new byte[message.Length - 5];
+            Array.Copy(message, 5, payload, 0, message.Length - 5);
             switch (id)
             {
                 case JSONConvert.LOGIN:
@@ -89,6 +96,26 @@ namespace Client
 
                 case JSONConvert.LOBBY:
                     // lobby data
+                    LobbyIdentifier lobbyIdentifier = JSONConvert.GetLobbyIdentifier(payload);
+                    switch (lobbyIdentifier)
+                    {
+                        case LobbyIdentifier.LIST:
+                            Debug.WriteLine("got lobbies list");
+                            Lobbies = JSONConvert.GetLobbiesFromMessage(payload);
+                            OnLobbiesListReceived?.Invoke();
+                            OnLobbiesReceivedAndWaitingForHost?.Invoke();
+                            break;
+                        case LobbyIdentifier.HOST:
+                            // we receive this when the server has made us a host of a new lobby
+                            // TODO get lobby id 
+                            Debug.WriteLine("[CLIENT] got lobby object");
+                            int lobbyCreatedID = JSONConvert.GetLobbyID(payload);
+                            OnLobbyCreated?.Invoke(lobbyCreatedID);
+                            break;
+                        case LobbyIdentifier.JOIN_SUCCESS:
+                            OnLobbyJoinSuccess?.Invoke();
+                            break;
+                    }
                     //TODO fill lobby with the data received
                     break;
                 case JSONConvert.CANVAS:
diff --git a/Client/ViewModels/ViewModel.cs b/Client/ViewModels/ViewModel.cs
index be55690..bbb9843 100644
--- a/Client/ViewModels/ViewModel.cs
+++ b/Client/ViewModels/ViewModel.cs
@@ -9,6 +9,8 @@ using System.Diagnostics;
 using System.Windows;
 using System.Collections.ObjectModel;
 using Client.Views;
+using System.Linq;
+using System.Windows.Data;
 
 namespace Client
 {
@@ -21,21 +23,101 @@ namespace Client
 
         public Lobby SelectedLobby { get; set; }
 
+        private Client client;
+
+        private bool wantToBeHost = false;
+        private int wantToBeHostId = 0;
+
         public ViewModel()
         {
             _model = new Model();
             _lobbies = new ObservableCollection<Lobby>();
+            client = ClientData.Instance.Client;
+            client.OnLobbiesListReceived = updateLobbies;
+            
 
-            _lobbies.Add(new Lobby(50, 3, 8));
-            _lobbies.Add(new Lobby(69, 1, 9));
-            _lobbies.Add(new Lobby(420, 7, 7));
+            OnHostButtonClick = new RelayCommand(hostGame);
 
-            OnHostButtonClick = new RelayCommand(() => 
+            JoinSelectedLobby = new RelayCommand(joinLobby, true);
+        }
+
+        private void hostGame()
+        {
+            Debug.WriteLine("attempting to host game for " + ClientData.Instance.User.Username);
+            client.SendMessage(JSONConvert.ConstructLobbyHostMessage());
+            client.OnLobbyCreated = becomeHostForLobby;
+        }
+
+        private void becomeHostForLobby(int id)
+        {
+            
+            Debug.WriteLine($"got host succes with data {id} ");
+            wantToBeHost = true;
+            wantToBeHostId = id;
+            client.OnLobbiesReceivedAndWaitingForHost = hostLobbiesReceived;
+
+        }
+
+        private void hostLobbiesReceived()
+        {
+            if (wantToBeHost)
+                foreach (Lobby l in Lobbies)
+                {
+                    if (l.ID == wantToBeHostId)
+                    {
+                        Debug.WriteLine("found lobby that we want to be host of: " + l.ID + ", joining..");
+                        SelectedLobby = l;
+                        startGameInLobby();
+                        wantToBeHost = false;
+                        client.OnLobbiesReceivedAndWaitingForHost = null;
+                        break;
+                    }
+                }
+        }
+
+        private void joinLobby()
+        {
+            // lobby die je wilt joinen verwijderen
+            // nieuwe binnengekregen lobby toevoegen
+            client.OnLobbyJoinSuccess = OnLobbyJoinSuccess;
+            client.SendMessage(JSONConvert.ConstructLobbyJoinMessage(SelectedLobby.ID));
+        }
+
+        private void OnLobbyJoinSuccess()
+        {
+            startGameInLobby();
+        }
+
+
+
+        private void updateLobbies()
+        {
+            Debug.WriteLine("updating lobbies...");
+            Lobby[] lobbiesArr = client.Lobbies;
+            Application.Current.Dispatcher.Invoke(delegate
             {
-                Debug.WriteLine("Host button clicked");
-            });
+                
+                //for (int i = 0; i < lobbiesArr.Length; i++)
+                //{
+                //    Lobby lobby = lobbiesArr[i];
+                //    Debug.WriteLine(lobby.PlayersIn);
+                //    if (i < _lobbies.Count && _lobbies[i].ID == lobby.ID)
+                //    {
+                //        _lobbies[i].Set(lobby);
+                //    } else
+                //    {
+                //        _lobbies.Add(lobbiesArr[i]);
+                //    }
+                //}
 
-            JoinSelectedLobby = new RelayCommand(startGameInLobby, true);
+                _lobbies.Clear();
+
+                foreach (Lobby l in lobbiesArr)
+                {
+                    _lobbies.Add(l);
+                }
+
+            });
         }
 
         private void startGameInLobby()
@@ -43,11 +125,18 @@ namespace Client
             if (SelectedLobby != null)
             {
                 ClientData.Instance.Lobby = SelectedLobby;
-                
-                _model.CanStartGame = false;
+                startGameWindow();
+            }
+        }
+
+        private void startGameWindow()
+        {
+            _model.CanStartGame = false;
+            Application.Current.Dispatcher.Invoke(delegate
+            {
                 GameWindow window = new GameWindow();
                 window.Show();
-            }
+            });
         }
 
         private void ClickCheck()
diff --git a/Client/Views/GameWindow.xaml.cs b/Client/Views/GameWindow.xaml.cs
index aacc67e..f527b39 100644
--- a/Client/Views/GameWindow.xaml.cs
+++ b/Client/Views/GameWindow.xaml.cs
@@ -113,5 +113,10 @@ namespace Client.Views
             string user = data.User.Username; 
             SentMessage.AppendText($"{user}: {message}\n");
         }
+
+        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
+        {
+
+        }
     }
 }
diff --git a/Client/Views/LoginScreen.xaml.cs b/Client/Views/LoginScreen.xaml.cs
index 780b619..5b742d2 100644
--- a/Client/Views/LoginScreen.xaml.cs
+++ b/Client/Views/LoginScreen.xaml.cs
@@ -34,6 +34,7 @@ namespace Client.Views
                 Application.Current.Dispatcher.Invoke(delegate {
                     data.User = user;
                     data.Client = client;
+                    client.SendMessage(JSONConvert.ConstructLobbyRequestMessage());
                     MainWindow startWindow = new MainWindow();
                     startWindow.Show();
                     this.Close();
diff --git a/Client/Views/MainWindow.xaml.cs b/Client/Views/MainWindow.xaml.cs
index aa9cf2f..058bbc8 100644
--- a/Client/Views/MainWindow.xaml.cs
+++ b/Client/Views/MainWindow.xaml.cs
@@ -33,18 +33,7 @@ namespace Client
         private void Button_Click(object sender, RoutedEventArgs e)
         {
 
-            Lobby lobbySelected = LobbyList.SelectedItem as Lobby;
-            if(lobbySelected != null)
-            {
-                testLabel.Content = lobbySelected.ID;
-                colorSelection.IsEnabled = false;
-                joinButton.IsEnabled = false;
-                hostButton.IsEnabled = false;
-
-                GameWindow window = new GameWindow();
-                window.Show();
-                Close();
-            }
+            
         }
     }
 }
diff --git a/Server/Models/ServerClient.cs b/Server/Models/ServerClient.cs
index b10639b..24a7a6f 100644
--- a/Server/Models/ServerClient.cs
+++ b/Server/Models/ServerClient.cs
@@ -1,10 +1,12 @@
 
+using Client;
 using SharedClientServer;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Net.Sockets;
 using System.Text;
+using static SharedClientServer.JSONConvert;
 
 namespace Server.Models
 {
@@ -121,6 +123,8 @@ namespace Server.Models
 
                 case JSONConvert.LOBBY:
                     // lobby data
+                    LobbyIdentifier l = JSONConvert.GetLobbyIdentifier(payload);
+                    handleLobbyMessage(payload,l);
                     break;
                 case JSONConvert.CANVAS:
                     // canvas data
@@ -130,7 +134,30 @@ namespace Server.Models
                     Debug.WriteLine("[SERVER] Received weird identifier: " + id);
                     break;
             }
-            //TODO implement ways to handle the message
+        }
+
+        private void handleLobbyMessage(byte[] payload, LobbyIdentifier l)
+        {
+            switch (l)
+            {
+                case LobbyIdentifier.REQUEST:
+                    Debug.WriteLine("[SERVERCLIENT] got lobby request message, sending lobbies...");
+                    sendMessage(JSONConvert.ConstructLobbyListMessage(ServerCommunication.INSTANCE.lobbies.ToArray()));
+                    break;
+                case LobbyIdentifier.HOST:
+                    // add new lobby and add this serverclient to it
+                    int createdLobbyID = ServerCommunication.INSTANCE.HostForLobby(this.User);
+                    Debug.WriteLine("[SERVERCLIENT] created lobby");
+                    sendMessage(JSONConvert.ConstructLobbyHostCreatedMessage(createdLobbyID));
+                    ServerCommunication.INSTANCE.sendToAll(JSONConvert.ConstructLobbyListMessage(ServerCommunication.INSTANCE.lobbies.ToArray()));
+                    break;
+                case LobbyIdentifier.JOIN:
+                    int id = JSONConvert.GetLobbyID(payload);
+                    ServerCommunication.INSTANCE.JoinLobby(this.User,id);
+                    sendMessage(JSONConvert.ConstructLobbyJoinSuccessMessage());
+                    ServerCommunication.INSTANCE.sendToAll(JSONConvert.ConstructLobbyListMessage(ServerCommunication.INSTANCE.lobbies.ToArray()));
+                    break;
+            }
         }
 
         /// <summary>
diff --git a/Server/Models/ServerCommunication.cs b/Server/Models/ServerCommunication.cs
index ee51859..497f901 100644
--- a/Server/Models/ServerCommunication.cs
+++ b/Server/Models/ServerCommunication.cs
@@ -32,7 +32,10 @@ namespace Server.Models
             listener = new TcpListener(IPAddress.Any, port);
             serverClients = new List<ServerClient>();
             lobbies = new List<Lobby>();
+            Lobby temp = new Lobby(1, 7, 8);
+            lobbies.Add(temp);
             serverClientsInlobbies = new Dictionary<Lobby, List<ServerClient>>();
+            serverClientsInlobbies.Add(temp, new List<ServerClient>());
         }
 
         /// <summary>
@@ -117,6 +120,18 @@ namespace Server.Models
             }
         }
 
+        public Lobby GetLobbyForUser(User user)
+        {
+            foreach (Lobby l in lobbies)
+            {
+                if (l.Users.Contains(user))
+                {
+                    return l;
+                }
+            }
+            return null;
+        }
+
         public void AddToLobby(Lobby lobby, User user)
         {
             foreach (Lobby l in lobbies)
@@ -125,6 +140,7 @@ namespace Server.Models
                 {
                     bool succ;
                     l.AddUser(user, out succ);
+                    Debug.WriteLine("[SERVERCOMM] added user to lobby, now contains " + l.PlayersIn);
                     if (!succ)
                     {
                         // TODO send lobby full message
@@ -144,5 +160,28 @@ namespace Server.Models
                 }
             }
         }
+
+        public int HostForLobby(User user)
+        {
+            Lobby lobby = new Lobby( lobbies.Count + 1,0, 8);
+            lobbies.Add(lobby);
+            serverClientsInlobbies.Add(lobby, new List<ServerClient>());
+            user.Host = true;
+            AddToLobby(lobby, user);
+            return lobby.ID;
+        }
+
+        public void JoinLobby(User user, int id)
+        {
+            foreach (Lobby l in lobbies)
+            {
+                if (l.ID == id)
+                {
+                    AddToLobby(l, user);
+                    Debug.WriteLine($"{user.Username} joined lobby with id {id}");
+                    break;
+                }
+            }
+        }
     }
 }
diff --git a/SharedClientServer/JSONConvert.cs b/SharedClientServer/JSONConvert.cs
index b0d83cb..dd967e8 100644
--- a/SharedClientServer/JSONConvert.cs
+++ b/SharedClientServer/JSONConvert.cs
@@ -1,8 +1,10 @@
 using Client;
 using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
+using System.Linq;
 using System.Text;
 
 namespace SharedClientServer
@@ -14,11 +16,13 @@ namespace SharedClientServer
         public const byte LOBBY = 0x03;
         public const byte CANVAS = 0x04;
 
-        enum LobbyIdentifier
+        public enum LobbyIdentifier
         {
             HOST,
-            ADD,
+            JOIN,
+            JOIN_SUCCESS,
             LEAVE,
+            LIST,
             REQUEST
         }
         public static (string,string) GetUsernameAndMessage(byte[] json)
@@ -43,12 +47,98 @@ namespace SharedClientServer
             });
         }
 
-        public static byte[] ConstructLobbyDataMessage(Lobby lobby)
+        #region lobby messages
+
+        public static byte[] ConstructLobbyHostMessage()
         {
-            return null;
+            return GetMessageToSend(LOBBY, new
+            {
+                identifier = LobbyIdentifier.HOST
+            });
         }
 
+        public static byte[] ConstructLobbyHostCreatedMessage(int lobbyID)
+        {
+            return GetMessageToSend(LOBBY, new
+            {
+                identifier = LobbyIdentifier.HOST,
+                id = lobbyID
+            }) ;
+        }
 
+        public static byte[] ConstructLobbyRequestMessage()
+        {
+            return GetMessageToSend(LOBBY, new
+            {
+                identifier = LobbyIdentifier.REQUEST
+            });
+        }
+
+        public static byte[] ConstructLobbyListMessage(Lobby[] lobbiesList)
+        {
+            return GetMessageToSend(LOBBY, new
+            { 
+                identifier = LobbyIdentifier.LIST,
+                lobbies = lobbiesList
+            });
+        }
+
+        public static byte[] ConstructLobbyJoinMessage(int lobbyID)
+        {
+            return GetMessageToSend(LOBBY, new
+            {
+                identifier = LobbyIdentifier.JOIN,
+                id = lobbyID
+            });
+        }
+
+        public static byte[] ConstructLobbyLeaveMessage(int lobbyID)
+        {
+            return GetMessageToSend(LOBBY, new
+            {
+                identifier = LobbyIdentifier.LEAVE,
+                id = lobbyID
+            });
+        }
+        public static LobbyIdentifier GetLobbyIdentifier(byte[] json)
+        {
+            dynamic payload = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json));
+            return payload.identifier;
+        }
+
+        public static Lobby[] GetLobbiesFromMessage(byte[] json)
+        {
+            dynamic payload = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json));
+            JArray lobbiesArray = payload.lobbies;
+            Debug.WriteLine("[JSONCONVERT] got lobbies from message" + lobbiesArray.ToString());
+            Lobby[] lobbiesTemp = lobbiesArray.ToObject<Lobby[]>();
+            Debug.WriteLine("lobbies in array: ");
+            foreach (Lobby l in lobbiesTemp)
+            {
+                Debug.WriteLine("players: " + l.PlayersIn);
+            }
+            return lobbiesTemp;
+        }
+
+        public static int GetLobbyID(byte[] json)
+        {
+            dynamic payload = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json));
+            return payload.id;
+        }
+
+        public static Lobby GetLobby(byte[] json)
+        {
+            dynamic payload = JsonConvert.DeserializeObject(Encoding.ASCII.GetString(json));
+            JObject dynamicAsObject = payload.lobby;
+            return dynamicAsObject.ToObject<Lobby>();
+        }
+
+        public static byte[] ConstructLobbyJoinSuccessMessage()
+        {
+            return GetMessageToSend(LOBBY, new { identifier = LobbyIdentifier.JOIN_SUCCESS});
+        }
+
+        #endregion
 
         /// <summary>
         /// constructs a message that can be sent to the clients or server
@@ -70,5 +160,7 @@ namespace SharedClientServer
             Array.Copy(BitConverter.GetBytes(payloadBytes.Length+5),0,res,0,4);
             return res;
         }
+
+        
     }
 }
diff --git a/SharedClientServer/Lobby.cs b/SharedClientServer/Lobby.cs
index 5a69627..2ddf501 100644
--- a/SharedClientServer/Lobby.cs
+++ b/SharedClientServer/Lobby.cs
@@ -64,16 +64,29 @@ namespace Client
 
         public int PlayersIn
         {
-            get { return _playersIn; }
+            get { return _users.Count; }
             set { _playersIn = value; }
         }
 
+        public void Set(Lobby lobby)
+        {
+            this._id = lobby._id;
+            this._users = lobby._users;
+            this._maxPlayers = lobby._maxPlayers;
+        }
+
         public int MaxPlayers
         {
             get { return _maxPlayers; }
             set { _maxPlayers = value; }
         }
 
+        public List<User> Users
+        {
+            get { return _users; }
+            set { _users = value; }
+        }
+
 
     }
 }
diff --git a/SharedClientServer/User.cs b/SharedClientServer/User.cs
index 6e95f64..35ec378 100644
--- a/SharedClientServer/User.cs
+++ b/SharedClientServer/User.cs
@@ -1,4 +1,5 @@
-using System;
+using Newtonsoft.Json;
+using System;
 using System.Collections.Generic;
 using System.Text;
 
@@ -10,6 +11,7 @@ namespace SharedClientServer
         private int _score;
         private bool _host;
 
+        [JsonConstructor]
         public User(string username, int score, bool host)
         {
             _username = username;