How to run two process at once using kivy - python-3.x

Question

I'm struggling to simultaneously run my Kivy app alongside a python script that is being locally imported.
Full python code
import Client # Locall import
import time
from threading import Thread
from kivy.app import App
from kivy.uix.button import Button
from kivy.lang import Builder
from kivy.uix.screenmanager import ScreenManager, Screen
class MainWindow(Screen):
pass
class SecondWindow(Screen):
pass
class WindowManager(ScreenManager):#will manage navigation of windows
pass
kv = Builder.load_file("my.kv")
class Sound(App):
def build(self):
return kv
def ipconfig(self,input_ip):
if len(input_ip) == 13:
print('Address binded!!')
Client.host = input_ip #Modify ip adress
else:
print('Invalid input_ip')```
if __name__ == '__main__':
#Sound().run()#Kivy run method
Thread(target = Sound().run()).start()
time.sleep(10)
Thread(target = Client.father_main).start()
Where the threading happens
if __name__ == '__main__':
#Sound().run()#Kivy run method
Thread(target = Sound().run()).start()
time.sleep(10)
Thread(target = Client.father_main).start() #Client is locally imported
PROBLEMS
1.Only the kivy app runs but the father_main function fails to.
2.The only time father_main runs is when I close the kivy application.
3.If i try and remove the 'run()' from Sound(). I get TypeError: 'Sound' object is not callable and father_main immediately runs
4.If i only remove the parenthesis from 'run()' so it turns into 'run'. I get Segmentation fault (core dumped)

Answer 1

kivy does not encourage the use of time.sleep() and i still have no clue of what exactly your program is but here a solution.
create an on_start method (A method that runs when kivy app started) and add start the ipconfig method from there but you're going to start it asynchronously.
from multiprocessing.pool import ThreadPool
class Sound(App):
def on_start(self):
pool = ThreadPool(processes=1)
async_start = pool.apply_async(self.ip_config, ("value for ip_input here"))
# do some other things inside the main thread here
if __name__ == "__main__":
Sound().run()

Answer 2

You need to run the App on the main thread. I would suggest something like:
def start_father_main(dt):
Thread(target = Client.father_main).start() #Client is locally imported
if __name__ == '__main__':
Clock.schedule_once(start_father_main, 10)
Sound().run()
I haven't tested this code, but it should give you the idea.