BOM是由相关的各级编号组成，遵循总装和组装的结构。
BOM's are characterized by the number of levels involved, following the structure of assemblies and sub assemblies.
通过启用这个选项，我们就可以通过sctp _ recvmsg api函数接收一条消息，我们还接收到一个包含流编号的sctp _ sndrcvinfo结构。
With this enabled, when I receive a message through the sctp_recvmsg API function, I also receive a sctp_sndrcvinfo structure that contains the stream number.
以管脚编号为中心，然后再进入到一个switch结构，根据连接到此管脚的传感器来采取不同的措施。
Focusing on the pin number, it then goes into a switch structure that takes a different action depending on which sensor is connected to the pin.
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