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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _restore_event_client(self):
 """Restores previously created event client."""

        if not self._event_client:
            self._event_client = self._start_event_client()
            return
        self._event_client.host_port = self.host_port
        self._event_client.device_port = self.device_port
        self._event_client.connect()