La connexion Golang TCP fonctionne mais pas UDP

timeout := 30 * time.second
    conn, err := net.dialtimeout("tcp", "localhost:1902", timeout)
    if err != nil {
        panic("failed to connect to localhost:1902")
    }
    defer conn.close()

    f := log.ldate | log.lshortfile
    logger := log.new(conn, "example-", f)
    logger.println("this is a regular message1")
    logger.println("this is a regular message2")
    logger.println("this is a regular message3")
    logger.println("this is a regular message4")
    logger.println("this is a regular message5")
    logger.println("this is a regular message6")

example-2022/11/18 technique24.go:21: this is a regular message1
example-2022/11/18 technique24.go:22: this is a regular message2
example-2022/11/18 technique24.go:23: this is a regular message3
example-2022/11/18 technique24.go:24: this is a regular message4
example-2022/11/18 technique24.go:25: this is a regular message5
example-2022/11/18 technique24.go:26: this is a regular message6

timeout := 30 * time.Second
    conn, err := net.DialTimeout("udp", "localhost:1902", timeout)
    if err != nil {
        panic("Failed to connect to localhost:1902")
    }
    defer conn.Close()

    f := log.Ldate | log.Lshortfile
    logger := log.New(conn, "example-", f)
    logger.Println("This is a regular message1")
    logger.Println("This is a regular message2")
    logger.Println("This is a regular message3")
    logger.Println("This is a regular message4")
    logger.Println("This is a regular message5")
    logger.Println("This is a regular message6")