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关于广播包的问题

广播包的设置,

#define BCAST_DELIVERY_TIME  30

_NIB.BroadcastDeliceryTime=BCAST_DELIVERY_TIME  

-DMAX_BCAST=9

这些是默认配置,两个疑惑的地方

1.#define BCAST_DELIVERY_TIME  30  这个30表示的广播包存在的时间,是30ms吗?

2.在BCAST_DELIVERY_TIME  的时间内发送数据包9次,这是我看别的帖子上的,想问一下,这个发送9次,值得是发送广播包给所有节点9次,还是给九个节点发     送?

感谢!!