So this RCM message buffer is the header where it checks this length, for example.

因此，例如，此 RCM 消息缓冲区是检查此长度的标头。

So then it copies the payload also into memory into a different place than this RCM message buffer.

因此，它将有效负载也复制到内存中与此 RCM 消息缓冲区不同的位置。