How to measure RTT/Latency in a concurrent UDP server and clients created in GoLang?

I was able to run a concurrent UDP server and connect UDP clients to this concurrent server. However, I would like to know how to measure the latency of this UDP server.

For some reason, Netcat commands in Linux do not work and they work well with TCP. I can't seem to measure it because I am hosting this server on my machine and I am trying to measure the latency. Additionally, a lot of UDP clients can connect to the UDP server concurrently, there seems to be a very high limit.

Should I instead create a docker container and run it on a router and then measure the latency to the router? How would you proceed with this?

Below is the code for the UDP Web server:

package main

import (
    "fmt"
    "math/rand"
    "net"
    "os"
    "strconv"
    "strings"
    "time"
)

func random(min, max int) int {
    return rand.Intn(max-min) + min
}

func main() {
    arguments := os.Args
    if len(arguments) == 1 {
        fmt.Println("Please provide a port number!")
        return
    }
    PORT := ":" + arguments[1]

    s, err := net.ResolveUDPAddr("udp4", PORT)
    if err != nil {
        fmt.Println(err)
        return
    }

    connection, err := net.ListenUDP("udp4", s)
    if err != nil {
        fmt.Println(err)
        return
    }

    defer connection.Close()
    buffer := make([]byte, 1024)
    rand.Seed(time.Now().Unix())

    for {
        n, addr, err := connection.ReadFromUDP(buffer)
        go func() {
            fmt.Print("-> ", string(buffer[0:n-1]))
            fmt.Println(addr.String())
            if strings.TrimSpace(string(buffer[0:n])) == "STOP" {
                fmt.Println("Exiting UDP server!")
                return
            }

            data := []byte(strconv.Itoa(random(1, 1001)))
            fmt.Printf("data: %s\n", string(data))
            _, err = connection.WriteToUDP(data, addr)
            if err != nil {
                fmt.Println(err)
                return
            }
        }()
    }
}

Below is the code for the UDP clients:

package main

import (
    "fmt"
    "net"
    "os"
    "time"
)

func check(err error) {
    if err != nil {
        panic(err)
    }
}

func main() {
    arguments := os.Args
    if len(arguments) == 1 {
        fmt.Println("Please provide a host:port string")
        return
    }
    CONNECT := arguments[1]

    s, err := net.ResolveUDPAddr("udp4", CONNECT)
    check(err)
    c, err := net.DialUDP("udp4", nil, s)
    if err != nil {
        fmt.Println(err)
        return
    }

    fmt.Printf("The UDP server is %s\n", c.RemoteAddr().String())
    defer c.Close()

    for {
        time.Sleep(1 * time.Second)
        go func() {
            text := []byte("heyyyy")
            _, err := c.Write(text)
            if err != nil {
                fmt.Println(err)
                return
            }

            buffer := make([]byte, 1024)
            n, _, err := c.ReadFromUDP(buffer)
            if err != nil {
                fmt.Println(err)
                return
            }
            fmt.Printf("Reply: %s\n", string(buffer[0:n]))

        }()

    }
}