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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 ensure_opened(self, timeout):
 """Ensure this stream transport was successfully opened. Checks to make sure we receive our initial OKAY message. This must be called after creating this AdbStreamTransport and before calling read() or write(). Args: timeout: timeouts.PolledTimeout to use for this operation. Returns: True if this stream was successfully opened, False if the service was not recognized by the remote endpoint. If False is returned, then this AdbStreamTransport will be already closed. Raises: AdbProtocolError: If we receive a WRTE message instead of OKAY/CLSE. """

    self._handle_message(self.adb_connection.read_for_stream(self, timeout),
                         handle_wrte=False)
    return self.is_open()