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 <wangj...@gmail.com> > 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 MAY be the TEP116 document is out-of-date?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 > Tinyos-help@millennium.berkeley.edu > https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > -- Eric B. Decker Senior (over 50 :-) Researcher
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