RCM itself is a relatively simple USB protocol using so-called bulk transfers.

RCM 本身是一个相对简单的 USB 协议，使用所谓的批量传输。

For example, this one here is right now used for the bulk transfer to receive the RCM message.

例如，这里的这个现在用于批量传输以接收 RCM 消息。

So while I am handling a bulk transfer, I can also have a control transfer pending that needs to be answered in between or after handling the current bulk packet.

因此，当我处理批量传输时，我还可以有一个控制传输挂起，需要在处理当前批量数据包之间或之后进行应答。