<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _listen(self, uuid=None, session=None):
 """ Listen a connection uuid """


        if self.url is None:
            raise Exception("NURESTPushCenter needs to have a valid URL. please use setURL: before starting it.")

        events_url = "%s/events" % self.url
        if uuid:
            events_url = "%s?uuid=%s" % (events_url, uuid)

        request = NURESTRequest(method='GET', url=events_url)

        # Force async to False so the push center will have only 1 thread running
        connection = NURESTConnection(request=request, async=True, callback=self._did_receive_event, root_object=self._root_object)

        if self._timeout:
            if int(time()) - self._start_time >= self._timeout:
                pushcenter_logger.debug("[NURESTPushCenter] Timeout (timeout=%ss)." % self._timeout)
                return

            else:
                connection.timeout = self._timeout

        pushcenter_logger.info('Bambou Sending >>>>>>\n%s %s' % (request.method, request.url))

        # connection.ignore_request_idle = True
        connection.start()