diff --git a/client-gui/src/main.rs b/client-gui/src/main.rs
index 0b48e8c..ba7a31c 100644
--- a/client-gui/src/main.rs
+++ b/client-gui/src/main.rs
@@ -34,4 +34,6 @@ async fn main() -> eframe::Result<()> {
             Ok(Box::new(app))
         }),
     )
+
+    // Starts the protocol
 }
diff --git a/client-network/src/cryptographic_signature.rs b/client-network/src/cryptographic_signature.rs
index 340db5c..96e4a2c 100644
--- a/client-network/src/cryptographic_signature.rs
+++ b/client-network/src/cryptographic_signature.rs
@@ -45,7 +45,7 @@ pub fn formatPubKey(crypto_pair: CryptographicSignature) -> String {
 ///
 /// takes a serialized message and adds the signature using the private key
 ///
-pub fn sign_message(crypto_pair: CryptographicSignature, message: Vec<u8>) -> Vec<u8> {
+pub fn sign_message(crypto_pair: &CryptographicSignature, message: &Vec<u8>) -> Vec<u8> {
     let length_bytes: [u8; 2] = message[5..7]
         .try_into()
         .expect("slice with incorrect length");
@@ -105,7 +105,7 @@ mod tests {
         let crypto_pair = CryptographicSignature::new(username.clone());
         let handshake = HandshakeMessage::hello(0, 12, username);
         let ser = handshake.serialize();
-        let signed_message = sign_message(crypto_pair, ser.clone());
+        let signed_message = sign_message(&crypto_pair, &ser);
         println!("unsigned_message: {:?}", ser);
         println!("signed_message: {:?}", signed_message);
     }
diff --git a/client-network/src/lib.rs b/client-network/src/lib.rs
index 957c39a..72c98af 100644
--- a/client-network/src/lib.rs
+++ b/client-network/src/lib.rs
@@ -1,8 +1,22 @@
 mod cryptographic_signature;
 mod data;
+mod message_handling;
+mod messages_channels;
 mod messages_structure;
 mod registration;
 
+use crate::{
+    cryptographic_signature::CryptographicSignature,
+    message_handling::EventType,
+    messages_channels::{MultipleSenders, start_receving_thread},
+    registration::{register_ip_addresses, register_with_the_server},
+};
+use std::sync::{Arc, Mutex};
+use std::{
+    net::{SocketAddr, UdpSocket},
+    str::FromStr,
+};
+
 /// Messages sent to the Network thread by the GUI.
 pub enum NetworkCommand {
     ConnectToServer(String), // ServerIP
@@ -29,6 +43,8 @@ pub enum NetworkEvent {
     // ...
 }
 
+use std::collections::HashMap;
+
 pub use crate::data::*;
 use crossbeam_channel::{Receiver, Sender};
 use sha2::{Digest, Sha256};
@@ -84,6 +100,46 @@ pub fn start_p2p_executor(
 
                         // Actual server connection
 
+                        let messages_list = HashMap::<i32, EventType>::new();
+
+                        let username = String::from("Gamixtreize");
+
+                        let crypto_pair = CryptographicSignature::new(username);
+
+                        let socket = UdpSocket::bind("0.0.0.0:0").expect("bind failed");
+
+                        let shared_socket = Arc::new(socket);
+                        let shared_cryptopair = Arc::new(crypto_pair);
+                        let shared_messageslist = Arc::new(Mutex::new(messages_list));
+
+                        let senders = MultipleSenders::new(1, &shared_socket);
+
+                        let shared_senders = Arc::new(senders);
+                        if let Err(e) = register_with_the_server(&shared_cryptopair, &ip).await {
+                            eprintln!("request failed: {}", e);
+                        }
+
+                        match SocketAddr::from_str(&ip) {
+                            Ok(sockaddr) => {
+                                start_receving_thread(
+                                    &shared_socket,
+                                    &shared_messageslist,
+                                    &shared_cryptopair,
+                                    sockaddr,
+                                    &shared_senders,
+                                );
+                                register_ip_addresses(
+                                    &shared_cryptopair,
+                                    ip,
+                                    &shared_senders,
+                                    &shared_messageslist,
+                                );
+                            }
+                            Err(e) => {
+                                eprintln!("failed to parse socket address: {}", e);
+                            }
+                        }
+
                         tokio::time::sleep(std::time::Duration::from_millis(5000)).await;
 
                         let res = event_tx.send(NetworkEvent::Connected());
diff --git a/client-network/src/messages_channels.rs b/client-network/src/messages_channels.rs
index e69de29..472998b 100644
--- a/client-network/src/messages_channels.rs
+++ b/client-network/src/messages_channels.rs
@@ -0,0 +1,142 @@
+use crate::cryptographic_signature::CryptographicSignature;
+use crate::message_handling::EventType;
+use crate::message_handling::handle_recevied_message;
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::net::UdpSocket;
+use std::sync::{Arc, Mutex};
+
+use std::sync::mpsc::{self, Sender};
+use std::thread;
+
+pub struct MultipleSenders {
+    senders: Vec<Sender<Message>>,
+}
+
+pub struct Message {
+    payload: Vec<u8>,
+    address: String,
+}
+
+impl Message {
+    pub fn new(payload: Vec<u8>, address: String) -> Self {
+        Message {
+            payload: payload,
+            address: address,
+        }
+    }
+}
+
+impl MultipleSenders {
+    pub fn new(num_channels: usize, socket: &Arc<UdpSocket>) -> Self {
+        let mut senders = Vec::new();
+
+        // Wrap the socket in an Arc so it can be shared across threads
+
+        for i in 0..num_channels {
+            let (tx, rx) = mpsc::channel::<Message>();
+
+            // Clone the Arc (this just bumps the reference count, it doesn't copy the socket)
+            let sock_clone = Arc::clone(&socket);
+
+            senders.push(tx);
+
+            thread::spawn(move || {
+                println!("Canal d'envoi {} prêt", i);
+
+                for msg in rx {
+                    // Use the cloned Arc inside the thread
+                    if let Err(e) = sock_clone.send_to(&msg.payload, &msg.address) {
+                        eprintln!("Erreur d'envoi sur canal {}: {}", i, e);
+                    } else {
+                        let message_id: [u8; 4] = msg.payload[0..4].try_into().expect("size error");
+                        let id = i32::from_be_bytes(message_id);
+                        let message_type = msg.payload[4];
+                        println!(
+                            "Message {0} de type {1} envoyé à {2} par le canal {3}",
+                            id, message_type, msg.address, i
+                        );
+                    }
+                }
+            });
+        }
+
+        MultipleSenders { senders }
+    }
+
+    /// Envoie un message via un canal spécifique (round-robin ou index précis)
+    pub fn send_via(&self, channel_idx: usize, data: Vec<u8>, remote_addr: String) {
+        if let Some(sender) = self.senders.get(channel_idx) {
+            let _ = sender.send(Message {
+                payload: data,
+                address: remote_addr,
+            });
+        }
+    }
+}
+
+/*pub fn start_receving_thread(
+    socket: &Arc<UdpSocket>,
+    messages_list: &Arc<HashMap<i32, EventType>>,
+    crypto_pair: &Arc<CryptographicSignature>,
+    socket_addr: SocketAddr,
+    senders: &Arc<MultipleSenders>,
+) {
+    let sock_clone = Arc::clone(socket);
+    let cryptopair_clone = Arc::clone(crypto_pair);
+    let senders_clone = Arc::clone(senders);
+    let messages_clone = Arc::clone(messages_list);
+    thread::spawn(move || {
+        let mut buf = [0u8; 1024];
+
+        loop {
+            match sock_clone.recv_from(&mut buf) {
+                Ok((amt, src)) => {
+                    handle_recevied_message(
+                        &messages_clone,
+                        &buf.to_vec(),
+                        &cryptopair_clone,
+                        &socket_addr,
+                        &senders_clone,
+                    );
+                    println!("Reçu {} octets de {}: {:?}", amt, src, &buf[..amt]);
+                }
+                Err(e) => eprintln!("Erreur de réception: {}", e),
+            }
+        }
+    });
+}*/
+
+pub fn start_receving_thread(
+    socket: &Arc<UdpSocket>,
+    messages_list: &Arc<Mutex<HashMap<i32, EventType>>>,
+    crypto_pair: &Arc<CryptographicSignature>,
+    socket_addr: SocketAddr,
+    senders: &Arc<MultipleSenders>,
+) {
+    let sock_clone = Arc::clone(socket);
+    let cryptopair_clone = Arc::clone(crypto_pair);
+    let senders_clone = Arc::clone(senders);
+    let messages_clone = Arc::clone(messages_list);
+    thread::spawn(move || {
+        let mut buf = [0u8; 1024];
+        loop {
+            match sock_clone.recv_from(&mut buf) {
+                Ok((amt, src)) => {
+                    // Only send the part of the buffer that contains data
+                    let received_data = buf[..amt].to_vec();
+
+                    handle_recevied_message(
+                        &messages_clone,
+                        &received_data,
+                        &cryptopair_clone,
+                        &socket_addr,
+                        &senders_clone,
+                    );
+                    println!("Reçu {} octets de {}: {:?}", amt, src, received_data);
+                }
+                Err(e) => eprintln!("Erreur de réception: {}", e),
+            }
+        }
+    });
+}
diff --git a/client-network/src/registration.rs b/client-network/src/registration.rs
index 41e64ff..8f86d44 100644
--- a/client-network/src/registration.rs
+++ b/client-network/src/registration.rs
@@ -1,36 +1,37 @@
 use bytes::Bytes;
 
 use crate::cryptographic_signature::{CryptographicSignature, formatPubKey, sign_message};
+use crate::message_handling::EventType;
+use crate::messages_channels::{Message, MultipleSenders};
 use crate::messages_structure::{HandshakeMessage, UDPMessage};
+use std::collections::HashMap;
+use std::net::SocketAddr;
 use std::net::UdpSocket;
+use std::sync::{Arc, Mutex};
 
 ///
 /// sends the cryptographic signature to the server using a PUT request over the HTTP API.
 ///
-async fn register_with_the_server(
-    crypto_pair: CryptographicSignature,
+pub async fn register_with_the_server(
+    crypto_pair: &Arc<CryptographicSignature>,
+    server_uri: &String,
 ) -> Result<(), reqwest::Error> {
     let client = reqwest::Client::new();
-    let uri = format!(
-        "https://jch.irif.fr:8443/peers/{}/key",
-        crypto_pair.username
-    );
+    let uri = format!("{0}/peers/{1}/key", server_uri, crypto_pair.username);
     let encoded_point = crypto_pair.pub_key.to_encoded_point(false);
     let pubkey_bytes = encoded_point.as_ref().to_vec();
     let pubkey_bytes_minus = pubkey_bytes[1..].to_vec();
     let res = client.put(uri).body(pubkey_bytes_minus).send().await?;
     if res.status().is_success() {
-        println!("Successfully registered with the server.");
+        let str = hex::encode(res.bytes().await?);
+        println!("Successfully registered with the server : {}", str);
     } else {
         eprintln!(
             "Failed to register with the server. Status: {}",
             res.status()
         );
-        let str = hex::encode(res.bytes().await?);
-        eprintln!("erreur : {}", str);
     }
     println!("register ip adresses");
-    register_ip_addresses(crypto_pair);
     Ok(())
 }
 
@@ -57,21 +58,33 @@ async fn get_socket_address(username: String) -> Result<Bytes, reqwest::Error> {
 ///
 /// registers the IP addresses by sending a Hello request to the server.
 ///
-fn register_ip_addresses(crypto_pair: CryptographicSignature) {
-    let socket = UdpSocket::bind("0.0.0.0:0").expect("bind failed");
+pub fn register_ip_addresses(
+    crypto_pair: &CryptographicSignature,
+    server_uri: String,
+    senders: &MultipleSenders,
+    messages_list: &Arc<Mutex<HashMap<i32, EventType>>>,
+) {
     let username_size = crypto_pair.username.len();
     let hello_handshake =
         HandshakeMessage::hello(545, username_size as u16 + 4, crypto_pair.username.clone());
     //HandshakeMessage::display(&hello_handshake);
     let hello_handshake_serialized = hello_handshake.serialize();
-    let message_signed = sign_message(crypto_pair, hello_handshake_serialized.to_vec());
-    socket
-        .send_to(&message_signed, "81.194.30.229:8443")
-        .expect("send failed");
-    let mut buf = [0u8; 1024];
+    let message_signed = sign_message(crypto_pair, &hello_handshake_serialized);
+    senders.send_via(0, message_signed, server_uri);
+    let mut list = messages_list.lock().expect("Failed to lock messages_list");
+    match list.get(&545) {
+        Some(_) => {
+            list.remove(&545);
+        }
+        None => {
+            list.insert(545, EventType::ServerHelloReply);
+        }
+    }
+    // 3. Perform the insertion
+    /*let mut buf = [0u8; 1024];
     socket.recv_from(&mut buf).expect("receive failed");
     let hello_handshake_received = UDPMessage::parse(buf.to_vec());
-    hello_handshake_received.display();
+    hello_handshake_received.display();*/
 }
 
 #[cfg(test)]
@@ -79,19 +92,20 @@ mod tests {
     // Note this useful idiom: importing names from outer (for mod tests) scope.
     use super::*;
 
-    ///
+    /*///
     /// does the procedure to register with the server
     ///
     #[tokio::test]
     async fn registering_with_server() {
-        let username = String::from("gamixtreize");
+        let username = String::from("gameixtreize");
+        let server_uri = String::from("https://jch.irif.fr:8443");
         let crypto_pair = CryptographicSignature::new(username);
-        if let Err(e) = register_with_the_server(crypto_pair).await {
+        if let Err(e) = register_with_the_server(crypto_pair, server_uri).await {
             eprintln!("Error during registration: {}", e);
         }
-    }
+    }*/
 
-    ///
+    /*///
     /// retreives the socket address of a given peer
     ///
     #[tokio::test]
@@ -105,5 +119,5 @@ mod tests {
                 eprintln!("Erreur HTTP: {}", e);
             }
         }
-    }
+    }*/
 }