[Python] How do I sucessfully stop TCPDump recording?

I am very new to python. My current project is to create a basic Tkinter window to start and stop a TCPdump Ethernet recording using a couple of buttons. I have been able to start a recording using a combination of subprocess and multiprocessing.So far I have been unsuccessful stopping the recording. I'm after advice on how to achieve this. Thanks. The code is being run on a raspberry pi 5

import tkinter as tk
import subprocess
import multiprocessing
import time


# tcpdump configuration & subprocess creation

def tcpdump_config():
test_entry_str = test_entry.get()
tcpdump_command = ['sudo', 'tcpdump', '-i', 'eth0', '-n', '-w', '/home/inst/Documents/Test' + str(test_entry_str) + '.pcap']
proc = subprocess.run(tcpdump_command, shell = False)

# Start recording process
def rec_start():
if test_entry.get() == "":
from tkinter import messagebox
messagebox.showinfo(title="Information", message="Enter Test Number")
else:
m1 = multiprocessing.Process(target=tcpdump_config ,daemon=True, name='m1')
m1.start()


# Stop subprocess
def rec_stop():
pass


I have tried unsuccessfully using the terminate and kill commands in various forms and the process continues to run.

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