Read loop, splits by CRLF and pushes received data
        to _data.

def _read_loop(self):
        """Read loop, splits by CRLF and pushes received data
        to _data.
        """
        while self._running:
            received_data_raw = self._receive_all()
            if self._running:
                self.receive_count += 1
                self.datetime_last_received = datetime.datetime.utcnow()
                received_data_split = received_data_raw.split(self.__CRLF)
                for received_data in received_data_split:
                    if received_data:
                        self._data(received_data)