in esp32-ble-device/main.py [0:0]
    def service_loop(self):
        # Apply application code here for periodic / looped functions or
        # leave as a slow loop to hold the process up to process event driven 
        # BLE / GPIO / IRQ notifications.
        try:
            while True:
                # Just do slow loop to hold up process
                time.sleep(10)
        except Exception as err:
            self.publish_exception(500, 'EXCEPTION: Service loop - ERROR MESSAGE: {}'.format(err))