diff --git a/NOTE.md b/NOTE.md
index e4d1abb..93978c5 100644
--- a/NOTE.md
+++ b/NOTE.md
@@ -1,12 +1,11 @@
 A faire :
-- Limite des bateaux, taille des pseudo, ...
-
-- Nom dans les options
 - Faire marcher le tchat
 - Sauvegarde / Quitter
+- Historique / Replay
 - Police d'écriture
 - Documenter
 
+
 - Voir si les event listener intégré à pyglet sont plus pratique que l'event propagation (?)
 - Faire une scène incluant par défaut les boutons "Retour" (?)
 
diff --git a/source/gui/scene/RoomCreate.py b/source/gui/scene/RoomCreate.py
index 1f72668..ff4d867 100644
--- a/source/gui/scene/RoomCreate.py
+++ b/source/gui/scene/RoomCreate.py
@@ -296,14 +296,18 @@ class RoomCreate(Scene):
         port = int(self.input_port.text)
 
         settings = PacketSettings(
-            username=self.input_username.text,
             grid_width=int(self.input_width.text),
             grid_height=int(self.input_height.text),
             host_start=self.checkbox_host_start.state,
             boats_length=[size for size, quantity in self.boat_size_amount.items() for _ in range(quantity)]
         )
 
-        self.window.set_scene(RoomHost, port=port, settings=settings)
+        self.window.set_scene(
+            RoomHost,
+            port=port,
+            username=self.input_username.text,
+            settings=settings
+        )
 
     def on_draw(self):
         self.batch_input_background.draw()
diff --git a/source/gui/scene/RoomHost.py b/source/gui/scene/RoomHost.py
index 18b9e1e..39f88f6 100644
--- a/source/gui/scene/RoomHost.py
+++ b/source/gui/scene/RoomHost.py
@@ -14,9 +14,10 @@ if TYPE_CHECKING:
 
 
 class RoomHost(Scene):
-    def __init__(self, window: "Window", port: int, settings: "PacketSettings", **kwargs):
+    def __init__(self, window: "Window", port: int, username: str, settings: "PacketSettings", **kwargs):
         super().__init__(window, **kwargs)
 
+        self.username: str = username
         self.ip_address: str = "127.0.0.1"
         self.port: int = port
 
@@ -59,7 +60,13 @@ class RoomHost(Scene):
             batch=self.batch_label
         )
 
-        self.thread_network = network.Host(window=self.window, daemon=True, port=self.port, settings=settings)
+        self.thread_network = network.Host(
+            window=self.window,
+            daemon=True,
+            port=self.port,
+            username=self.username,
+            settings=settings
+        )
         self.thread_network.start()
 
         self._refresh_ip_text()
@@ -70,10 +77,10 @@ class RoomHost(Scene):
     def _refresh_ip(self):
         while True:
             try:
-                response = requests.get('https://api.ipify.org')
+                response = requests.get('https://api.ipify.org', timeout=10)
                 response.raise_for_status()
                 break
-            except requests.HTTPError:
+            except (requests.HTTPError, requests.Timeout):
                 if self.thread_ip.stopped: return
 
         self.ip_address: str = response.content.decode('utf8')
diff --git a/source/network/Client.py b/source/network/Client.py
index af1e2c5..3671d45 100644
--- a/source/network/Client.py
+++ b/source/network/Client.py
@@ -3,7 +3,7 @@ from typing import TYPE_CHECKING, Any
 
 from source.gui import scene
 from source.network import game_network
-from source.network.packet import PacketUsername
+from source.network.packet import PacketUsername, PacketSettings
 from source.network.packet.abc import Packet
 from source.utils import StoppableThread
 from source.utils.thread import in_pyglet_context
@@ -34,8 +34,9 @@ class Client(StoppableThread):
 
             print(f"[Client] Connecté avec {connection}")
 
-            settings: Any = Packet.from_connection(connection)
-            PacketUsername(username=self.username).send_connection(connection)
+            settings: Any = PacketSettings.from_connection(connection)
+            PacketUsername(username=self.username).instance_send_connection(connection)
+            packet_username = PacketUsername.from_connection(connection)
 
             game_scene = in_pyglet_context(
                 self.window.set_scene,
@@ -45,7 +46,7 @@ class Client(StoppableThread):
 
                 boats_length=settings.boats_length,
                 name_ally=self.username,
-                name_enemy=settings.username,
+                name_enemy=packet_username.username,
                 grid_width=settings.grid_width,
                 grid_height=settings.grid_height,
                 my_turn=not settings.host_start
diff --git a/source/network/Host.py b/source/network/Host.py
index 79982ea..5b0cb2a 100644
--- a/source/network/Host.py
+++ b/source/network/Host.py
@@ -1,11 +1,11 @@
 import socket
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 from source.gui import scene
 from source.network import game_network
-from source.network.packet.abc import Packet
 from source.utils import StoppableThread
 from source.utils.thread import in_pyglet_context
+from source.network.packet import PacketUsername
 
 if TYPE_CHECKING:
     from source.gui.window import Window
@@ -17,10 +17,11 @@ class Host(StoppableThread):
     The thread executed on the person who create a room.
     """
 
-    def __init__(self, window: "Window", port: int, settings: "PacketSettings", **kw):
+    def __init__(self, window: "Window", port: int, username: str, settings: "PacketSettings", **kw):
         super().__init__(**kw)
 
         self.window = window
+        self.username = username
         self.settings = settings
         self.port = port
 
@@ -43,8 +44,9 @@ class Host(StoppableThread):
 
             print(f"[Serveur] Connecté avec {address}")
 
-            self.settings.send_connection(connection)
-            packet_username: Any = Packet.from_connection(connection)
+            self.settings.instance_send_connection(connection)
+            packet_username = PacketUsername.from_connection(connection)
+            PacketUsername(username=self.username).instance_send_connection(connection)
 
             game_scene = in_pyglet_context(
                 self.window.set_scene,
@@ -53,7 +55,7 @@ class Host(StoppableThread):
                 connection=connection,
 
                 boats_length=self.settings.boats_length,
-                name_ally=self.settings.username,
+                name_ally=self.username,
                 name_enemy=packet_username.username,
                 grid_width=self.settings.grid_width,
                 grid_height=self.settings.grid_height,
diff --git a/source/network/game_network.py b/source/network/game_network.py
index c2a2998..e2445c0 100644
--- a/source/network/game_network.py
+++ b/source/network/game_network.py
@@ -1,5 +1,5 @@
 import socket
-from typing import Any
+from typing import Type, Callable
 
 from source.gui.scene import Game
 from source.network.packet.abc import Packet
@@ -21,7 +21,7 @@ def game_network(
     :param connection: the connection with the other player
     """
 
-    game_methods = {
+    game_methods: dict[Type["Packet"], Callable] = {
         packet.PacketChat: game_scene.network_on_chat,
         packet.PacketBoatPlaced: game_scene.network_on_boat_placed,
         packet.PacketBombPlaced: game_scene.network_on_bomb_placed,
@@ -29,13 +29,15 @@ def game_network(
     }
 
     while True:
-        data: Any = Packet.from_connection(connection)
+        data_type: Type["Packet"] = Packet.type_from_connection(connection)
 
-        if data is None:
+        if data_type is None:
             if thread.stopped: return  # vérifie si le thread n'est pas censé s'arrêter
             continue
 
+        data = data_type.from_connection(connection)
+
         if in_pyglet_context(
-            game_methods[type(data)],  # récupère la methode relié ce type de donnée
+            game_methods[data_type],  # récupère la methode relié ce type de donnée
             connection, data
         ): return  # Appelle la méthode. Si elle renvoie True, arrête le thread
diff --git a/source/network/packet/PacketBoatPlaced.py b/source/network/packet/PacketBoatPlaced.py
index c1743c2..3af2f82 100644
--- a/source/network/packet/PacketBoatPlaced.py
+++ b/source/network/packet/PacketBoatPlaced.py
@@ -9,8 +9,6 @@ class PacketBoatPlaced(Packet):
     A packet that signal that all the boat of the player have been placed
     """
 
-    packet_size: int = 0
-
     def to_bytes(self):
         return b""
 
diff --git a/source/network/packet/PacketBombPlaced.py b/source/network/packet/PacketBombPlaced.py
index cf23dc3..7e30149 100644
--- a/source/network/packet/PacketBombPlaced.py
+++ b/source/network/packet/PacketBombPlaced.py
@@ -14,7 +14,6 @@ class PacketBombPlaced(Packet):
 
     position: Point2D = field()
 
-    packet_size: int = 2
     packet_format: str = ">BB"
 
     def to_bytes(self):
diff --git a/source/network/packet/PacketBombState.py b/source/network/packet/PacketBombState.py
index 59135aa..cb1fc79 100644
--- a/source/network/packet/PacketBombState.py
+++ b/source/network/packet/PacketBombState.py
@@ -15,7 +15,6 @@ class PacketBombState(Packet):
     position: Point2D = field()
     bomb_state: BombState = field()
 
-    packet_size: int = 3
     packet_format: str = ">BBb"
 
     def to_bytes(self):
diff --git a/source/network/packet/PacketChat.py b/source/network/packet/PacketChat.py
index 6ed7b05..014b573 100644
--- a/source/network/packet/PacketChat.py
+++ b/source/network/packet/PacketChat.py
@@ -1,4 +1,7 @@
+import socket
+import struct
 from dataclasses import dataclass, field
+from typing import Optional
 
 from source.network.packet.abc import Packet
 
@@ -11,11 +14,27 @@ class PacketChat(Packet):
 
     message: str = field()
 
-    packet_size: int = 256
+    packet_format = ">I"
 
     def to_bytes(self) -> bytes:
-        return self.message.encode("utf-8")
+        message: bytes = self.message.encode("utf-8")
+        message_len: int = len(message)
+
+        # envoie la taille du message, suivi des données du message
+        return struct.pack(f"{self.packet_format}{message_len}s", message_len, message)
 
     @classmethod
-    def from_bytes(cls, data: bytes):
-        return cls(message=data.decode("utf-8"))
+    def from_connection(cls, connection: socket.socket) -> "Packet":
+        message_len, *_ = struct.unpack(
+            cls.packet_format,
+            connection.recv(struct.calcsize(cls.packet_format))
+        )
+
+        format_: str = f">{message_len}s"
+
+        message, *_ = struct.unpack(
+            format_,
+            connection.recv(struct.calcsize(format_))
+        )
+
+        return cls(message=message.decode("utf-8"))
diff --git a/source/network/packet/PacketSettings.py b/source/network/packet/PacketSettings.py
index 4572f13..c0d75fa 100644
--- a/source/network/packet/PacketSettings.py
+++ b/source/network/packet/PacketSettings.py
@@ -1,3 +1,4 @@
+import socket
 import struct
 from dataclasses import dataclass, field
 
@@ -6,37 +7,45 @@ from source.network.packet.abc import Packet
 
 @dataclass
 class PacketSettings(Packet):
-    username: str = field()
     grid_width: int = field()
     grid_height: int = field()
     host_start: bool = field()
     boats_length: list = field()
 
-    packet_size: int = 51
-    packet_format: str = ">16sBB?32B"
+    packet_format: str = ">BB?I"
 
     def to_bytes(self):
-        boat_size = self.boats_length + ([0] * (32 - len(self.boats_length)))
+        boats_len: int = len(self.boats_length)
 
         return struct.pack(
-            self.packet_format,
+            f"{self.packet_format}{boats_len}B",
 
-            self.username.encode("utf-8"),
             self.grid_width,
             self.grid_height,
             self.host_start,
 
-            *boat_size
+            boats_len,
+
+            *self.boats_length
         )
 
     @classmethod
-    def from_bytes(cls, data: bytes):
-        username, grid_width, grid_height, host_start, *boats_length = struct.unpack(cls.packet_format, data)
+    def from_connection(cls, connection: socket.socket) -> "Packet":
+        grid_width, grid_height, host_start, boats_len = struct.unpack(
+            cls.packet_format,
+            connection.recv(struct.calcsize(cls.packet_format))
+        )
+
+        format_ = f">{boats_len}B"
+
+        boats_length = struct.unpack(
+            format_,
+            connection.recv(struct.calcsize(format_))
+        )
 
         return cls(
-            username=username.replace(b"\x00", b"").decode("utf-8"),
             grid_width=grid_width,
             grid_height=grid_height,
             host_start=host_start,
-            boats_length=list(filter(lambda value: value != 0, boats_length))
+            boats_length=list(boats_length)
         )
diff --git a/source/network/packet/PacketUsername.py b/source/network/packet/PacketUsername.py
index d4ae651..93767dc 100644
--- a/source/network/packet/PacketUsername.py
+++ b/source/network/packet/PacketUsername.py
@@ -1,3 +1,5 @@
+import socket
+import struct
 from dataclasses import dataclass, field
 
 from source.network.packet.abc import Packet
@@ -7,11 +9,26 @@ from source.network.packet.abc import Packet
 class PacketUsername(Packet):
     username: str = field()
 
-    packet_size: int = 16
+    packet_format: str = ">I"
 
     def to_bytes(self):
-        return self.username.encode("utf-8")
+        username = self.username.encode()
+        username_len = len(username)
+
+        return struct.pack(f"{self.packet_format}{username_len}s", username_len, username)
 
     @classmethod
-    def from_bytes(cls, data: bytes):
-        return cls(username=data.decode("utf-8"))
+    def from_connection(cls, connection: socket.socket) -> "PacketUsername":
+        username_len, *_ = struct.unpack(
+            cls.packet_format,
+            connection.recv(struct.calcsize(cls.packet_format))
+        )
+
+        format_: str = f">{username_len}s"
+
+        username, *_ = struct.unpack(
+            format_,
+            connection.recv(struct.calcsize(format_))
+        )
+
+        return cls(username=username.decode("utf-8"))
diff --git a/source/network/packet/abc/Packet.py b/source/network/packet/abc/Packet.py
index 9b4e345..f622bc3 100644
--- a/source/network/packet/abc/Packet.py
+++ b/source/network/packet/abc/Packet.py
@@ -1,14 +1,13 @@
 import socket
+import struct
 from abc import abstractmethod, ABC
 from typing import Type, Optional
 
-# TODO: struct.calcsize() au lieu de packet_size
-
 
 class Packet(ABC):
     packed_header: bytes
-    packet_size: int
     packet_id: int = 0
+    packet_format: str = ">"
 
     def __init_subclass__(cls, **kwargs):
         cls.packet_header = Packet.packet_id.to_bytes(1, "big")  # give a header to the newly created subclass
@@ -22,18 +21,22 @@ class Packet(ABC):
         """
         pass
 
-    @classmethod
-    @abstractmethod
-    def from_bytes(cls, data: bytes) -> "Packet":
+    def send_connection(self, connection: socket.socket):
         """
-        Convert a bytes object into a packet.
-        :param data: the data to convert into a packet. Should be "packet_size" long.
-        :return: a packet corresponding to the bytes.
+        Send the packet directly into a socket.
+        :param connection: the socket where to send the packet to.
         """
-        pass
+        connection.send(self.packet_header + self.to_bytes())
+
+    def instance_send_connection(self, connection: socket.socket):
+        """
+        Send the packet directly into a socket.
+        :param connection: the socket where to send the packet to.
+        """
+        connection.send(self.to_bytes())
 
     @classmethod
-    def cls_from_header(cls, packet_header: bytes) -> Type["Packet"]:
+    def type_from_header(cls, packet_header: bytes) -> Type["Packet"]:
         """
         Get a subclass from its packet header.
         :param packet_header: the header to find the corresponding subclass
@@ -44,31 +47,32 @@ class Packet(ABC):
             cls.__subclasses__()
         ))
 
-    def send_connection(self, connection: socket.socket):
+    @classmethod
+    def from_bytes(cls, data: bytes) -> "Packet":
         """
-        Send the packet directly into a socket.
-        :param connection: the socket where to send the packet to.
+        Convert a bytes object into a packet.
+        :param data: the data to convert into a packet. Should be "packet_size" long.
+        :return: a packet corresponding to the bytes.
         """
-        connection.send(self.packet_header + self.to_bytes())
+        pass
 
     @classmethod
-    def from_connection(cls, connection: socket.socket) -> Optional["Packet"]:
+    def type_from_connection(cls, connection: socket.socket) -> Optional[Type["Packet"]]:
+        try:
+            packet_header = connection.recv(1)
+        except socket.timeout:
+            return None
+
+        if not packet_header: return None  # ignore si le header est invalide
+        return cls.type_from_header(packet_header)
+
+    @classmethod
+    def from_connection(cls, connection: socket.socket) -> "Packet":
         """
         Receive a packet from a socket.
         :param connection: the socket where to get the data from
         :return: the packet, or None if there was nothing in the socket to receive.
         """
 
-        # get the packet type
-
-        packet_header: Optional[bytes] = None
-        try:
-            packet_header = connection.recv(1)
-        except socket.timeout:
-            pass
-
-        if not packet_header: return None  # ignore si le header est invalide
-        packet_type = cls.cls_from_header(packet_header)
-
-        # renvoie les données instanciées
-        return packet_type.from_bytes(connection.recv(packet_type.packet_size))
+        packet_size: int = struct.calcsize(cls.packet_format)
+        return cls.from_bytes(connection.recv(packet_size))