main.py

McuProtocol is a twisted protocol

...
class McuProtocol(basic.LineReceiver):
    
    def 
        def mcu_requested_shaft_delay_milliseconds(self, *args):
        """
        The MCU requested the shaft delay milliseconds from the config.

        Args:
            *args:  None

        Returns:    None

        """
        Logger.info('McuProtocol: Requested shaft-delay-ms')
        config = app.load_config()
        shaft_delay = config.get('Machine', 'shaft delay')
        self.transport.write('{:d}'.format(int(shaft_delay)))

    def anotherFunctions
    
class MyApp(Application)
...
    config = ConfigParser
...

if __name__ == '__main__':
    app = MyApp()   # used for getting config file from McuProtocol class... there has to be a better way...
    MyApp().run()