POLLING_TIMEOUT = 3600 # 1 hour
        POLLING_INTERVAL = 180 # 3 minutes

        def setInterval(func, tyme, on_success):
            """
            Run [func] every [tyme] seconds.. invoking [on_success] if it returns True.
            """
            t0 = time()
            while True:
                t1 = time()
                if t1 - t0 >= POLLING_TIMEOUT:
                    raise PollingTimeoutError
                success = func()
                if success:
                    logger.info('Target Acquired!')
                    break
                logger.info('Waiting for {} seconds before retry!'.format(tyme))
                sleep(tyme)

            on_success()

        def poll_sftp_server():
            target_file = 'xyz.txt'

            logger.info('Connecting to SFTP...')
            with pysftp.Connection(**settings.conn_details) as sftp:
                with sftp.cd('/SomeFolder'):
                    list_of_remote_files = sftp.listdir()
                    logger.info('Files found on the server: {}'.format(list_of_remote_files))
                    is_file_found = True if target_file in list_of_remote_files else False
            logger.info('Disconnecting from SFTP...')
            return is_file_found

        def trigger_func():
            some_func()

        setInterval(poll_sftp_server, POLLING_INTERVAL, on_success=trigger_func)