Register callback for message fetcher coroutines

async def message_fetcher_coroutine(self, loop):
        """
        Register callback for message fetcher coroutines
        """
        Global.LOGGER.debug('registering callbacks for message fetcher coroutine')
        self.isrunning = True
        while self.isrunning:
            loop.call_soon(self._fetch_messages)
            loop.call_soon(self._perform_system_check)
            await asyncio.sleep(Global.CONFIG_MANAGER.message_fetcher_sleep_interval)

        Global.LOGGER.debug('message fetcher stopped')