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File: [CENS] / tos-contrib / bsnoop / README (download)
Revision: 1.1, Sat Jun 18 00:32:45 2005 UTC (4 years, 5 months ago) by cvsanon
Branch: MAIN
CVS Tags: rdd_alpha_version_1, pregeonet, acoustic-05-18-06, PRE_TOSNIC_FIX, PRE_64BIT, LAURA_CALIBRATION_EXPERIMENTS, HEAD, ESS_RELEASE_3_5, ESS_RELEASE_3_4, ESS_RELEASE_3_2, ESS_RELEASE_3_1, ESS_RELEASE_3_0, ESS_RELEASE_2_0, ESS_CONNECTIVITY, ESS_CENTROUTE_TESTING, ESS2-CMS-V1_5_pretest, ESS2-CMS-V1_4cMergeSympathy, EMSTAR_RELEASE_2_5, CYCLOPS_RELEASE_CANDIDATE_2_0, CYCLOPS_PRERELEASE_STABLE, CENTROUTE_EMSTAR_SOCKETS, BG_1_0, BANGLADESH_ARSENIC_1_2, BANGLADESH_ARSENIC_1_1, AMARSS_JR_DEPLOYMENT_6_05_07

Readme for simple B-MAC snooper

BSnoop

Author: Tyler McHenry <smchenry@isi.edu>

BSnoop is a packet snooper for B-MAC that mimics the behavior of the
S-MAC snooper in tos-contrib/s-mac/apps/Snooper (except of course it
snoops B-MAC networks)

It sends the same preamble as the S-MAC snooper, which consists of a
BEGIN byte (0x7E) and then the length of the entire packet excluding
the BEGIN byte but including the length byte. The recieved packet then
is transmitted, including CRC but not including meta-data.

Because of the compatable format, the S-MAC snooper's snoop2 tool can
be used to dump output to the terminal. (The older 'snoop' will not
work because it assumes S-MAC packet lengths) Note: the CRC
calculation done by snoop2 will always report BAD CRC since it expects
an actual CRC rather than the CRC 'flag' that B-MAC sets.

Internally, the entire packet is buffered first, since unlike S-MAC,
the B-MAC stack does not have a byte stream interface. However, it is
still sent byte-at-a-time over UART. I have run into no issues with
packet reception being faster than UART transmission as of yet.

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