pyserial with multiprocessing gives me a ctype error

Hi I'm trying to write a module that lets me read and send data via pyserial. I have to be able to read the data in parallel to my main script. With the help of a stackoverflow user, I have a basic and working skeleton of the program, but when I tried adding a class I created that uses pyserial (handles finding port, speed, etc) found here I get the following error:

File "", line 1, in runfile('C:.../pythonInterface1/Main.py', wdir='C:/Users/Daniel.000/Desktop/Daniel/Python/pythonInterface1')

File "C:...\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 827, in runfile execfile(filename, namespace)

File "C:...\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile exec(compile(f.read(), filename, 'exec'), namespace)

File "C:/Users/Daniel.000/Desktop/Daniel/Python/pythonInterface1/Main.py", line 39, in p.start()

File "C:...\Anaconda3\lib\multiprocessing\process.py", line 112, in start self._popen = self._Popen(self)

File "C:...\Anaconda3\lib\multiprocessing\context.py", line 223, in _Popen return _default_context.get_context().Process._Popen(process_obj)

File "C:...\Anaconda3\lib\multiprocessing\context.py", line 322, in _Popen return Popen(process_obj)

File "C:...\Anaconda3\lib\multiprocessing\popen_spawn_win32.py", line 89, in init reduction.dump(process_obj, to_child)

File "C:...\Anaconda3\lib\multiprocessing\reduction.py", line 60, in dump ForkingPickler(file, protocol).dump(obj)

ValueError: ctypes objects containing pointers cannot be pickled

This is the code I am using to call the class in SerialConnection.py

import multiprocessing 
from time import sleep
from operator import methodcaller

from SerialConnection import SerialConnection as SC

class Spawn:
    def __init__(self, _number, _max):
        self._number = _number
        self._max = _max
        # Don't call update here

    def request(self, x):
        print("{} was requested.".format(x))

    def update(self):
        while True:
            print("Spawned {} of {}".format(self._number, self._max))
            sleep(2)

if __name__ == '__main__':
    '''
    spawn = Spawn(1, 1)  # Create the object as normal
    p = multiprocessing.Process(target=methodcaller("update"), args=(spawn,)) # Run the loop in the process
    p.start()
    while True:
        sleep(1.5)
        spawn.request(2)  # Now you can reference the "spawn"
    '''
    device = SC()
    print(device.Port)
    print(device.Baud)
    print(device.ID)
    print(device.Error)
    print(device.EMsg)
    p = multiprocessing.Process(target=methodcaller("ReadData"), args=(device,)) # Run the loop in the process
    p.start()
    while True:
        sleep(1.5)
        device.SendData('0003')

What am I doing wrong for this class to be giving me problems? Is there some form of restriction to use pyserial and multiprocessing together? I know it can be done but I don't understand how...

here is the traceback i get from python

Traceback (most recent call last): File "C:...\Python\pythonInterface1\Main.py", line 45, in p.start()

File "C:...\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\process.py", line 105, in start self._popen = self._Popen(self)

File "C:...\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\context.py", line 223, in _Popen return _default_context.get_context().Process._Popen(process_obj)

File "C:...\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\context.py", line 322, in _Popen return Popen(process_obj)

File "C:...\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\popen_spawn_win32.py", line 65, in init reduction.dump(process_obj, to_child)

File "C:...\AppData\Local\Programs\Python\Python36-32\lib\multiprocessing\reduction.py", line 60, in dump ForkingPickler(file, protocol).dump(obj) ValueError: ctypes objects containing pointers cannot be pickled

from pyserial with multiprocessing gives me a ctype error