Thank you for your interpretation Eric.
在 2011年4月8日 下午3:30，Eric Decker <[email protected]>写道： > > It is my interpretation that both the TEP and the coment > block are saying the same thing. So I don't see a problem. > > The TEP could be clearer but the intent of the clear is to > wipe everything about the packet header, footer, and any meta-data. > Application data is left intact. > > 2011/4/8 王靖 <[email protected]> > >> Hi all： >> >> I'm reading the TEP 116 Packet Protocols. >> >> In Section 2.1 there documents the "clear" command of Packet Interface. >> This command is described as the following: >> *The ``clear`` command clears out all headers, footers, and metadata* >> *for lower layers. For example, calling ``clear`` on a routing* >> *component, such as CollectionSenderC[4]_, will clear out the* >> *collection headers and footers. Furthermore, CollectionSenderC will* >> *recursively call ``clear`` on the layer below it, clearing out the* >> *link layer headers and footers. Calling ``clear`` is typically* >> *necessary when moving a packet across two link layers. Otherwise, the* >> *destination link layer may incorrectly interpret metadata from the* >> *source link layer, and, for example, transmit the packet on the wrong* >> *RF channel. Because ``clear`` prepares a packet for a particular link* >> *layer, in this example correct code would call the command on the* >> *destination link layer, not the source link layer.* >> >> TEP116 told us that the clear command is used for clear the header, >> footer, and meta-data field of the packet. Then I checked the code comments >> int *$TOSROOT/tos/interface/Packet.nc* about the "clear" command : >> * /** * >> * * Clear out this packet. Note that this is a deep operation and* >> * * total operation: calling clear() on any layer will completely* >> * * clear the packet for reuse.* >> * * @param 'message_t* ONE msg' the packet to clear* >> * */* >> * command void clear(message_t* msg);* >> >> MAY be the TEP116 document is out-of-date? Please update this document if >> I was right. >> * >> * >> >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help >> > > > > -- > Eric B. Decker > Senior (over 50 :-) Researcher > > >
_______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
