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关于AF_DATA_CONFIRM_CMD的疑问?

发送的时候,随便指定一个合法地址,就会产生AF_DATA_CONFIRM_CMD;

mac层的应答指的是数据到达接收方的mac层以后,接收方回一个ack数据包到发送方吗?

还是说发送自己mac层给自己的ack?