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package main

import (
	"fmt"
	"log"
	"net"
	"time"
)

func main() {
	targetIP := "10.211.55.10"
	targetPort := 12345

	udpAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", targetIP, targetPort))
	if err != nil {
		log.Fatal(err)
	}

	conn, err := net.DialUDP("udp", nil, udpAddr)
	if err != nil {
		log.Fatal(err)
	}
	defer conn.Close()

	payload := `又是熟悉的payload，總長1360`
	fmt.Println(len(payload))  # 1360

	chunkSize := 1000
	for i := 0; i < len(payload); i += chunkSize {
		end := i + chunkSize
		if end > len(payload) {
			end = len(payload)
		}

		_, err = conn.Write([]byte(payload[i:end]))
		if err != nil {
			log.Fatal(err)
		}

		fmt.Printf("Sent fragment: %s\n", payload[i:end])
		time.Sleep(1 * time.Millisecond)
	}

	fmt.Println("Packet sent successfully!")
}