```mermaid
sequenceDiagram
    Note over Client, Serveur: DatagramSocket("localhost", 66666)
    Client->>+Serveur: DatagramPacket("Salve !", 7, "localhost", 6666)
    Note over Serveur, Client: DatagramSocket("localhost", 66666)
    Serveur->>+Client: DatagramPacket("Accusé de réception", 19, "localhost", 6666)
```