Earthworm Modules:
Sniffwave Overview

(last revised 28 December, 2006)

Program to read waveform messages from Earthworm transport ring and, for each message, prints the logo and header information to the screen.

Usage: sniffwave2 <ring name> <station> <component> <network> <loc> <data flag y/n>

This will sniff for TYPE_TRACEBUF2 and TYPE_TRACE2_COM_UA packets having the desired station, component, network and location codes.

Or: sniffwave2 <ring name> <station> <component> <network> <data flag y/n>

which will search for TYPE_TRACEBUF and TYPE_TRACE_COM_UA packets containing the desired station, component and network codes.

Note that it is not possible to sniff for TYPE_TRACEBUF and TYPE_TRACEBUF2 packets at the same tie with a single instance of sniffwave; use two!

Appending the optional "verbose" argument causes module, installation and type names to be printed in addition to usual ID numbers

Example: sniffwave WAVE_RING PHOB wild NC wild n

or: sniffwave WAVE_RING NP1 HHZ ZZ 01 n

This would result in the output: 

Sniffing WAVE_RING for NP1.HHZ.ZZ.01
20060601_UTC_12:35:01 sniffwave: inRing flushed.
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:34:55.00 (1149183295.0000) 2006/06/01
 17:34:59.99 (1149183299.9900) i4 m100 t19 len2064
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:35:00.00 (1149183300.0000) 2006/06/01
 17:35:04.99 (1149183304.9900) i4 m100 t19 len2064
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:35:05.00 (1149183305.0000) 2006/06/01
 17:35:09.99 (1149183309.9900) i4 m100 t19 len2064
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:35:10.00 (1149183310.0000) 2006/06/01
 17:35:14.99 (1149183314.9900) i4 m100 t19 len2064
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:35:15.00 (1149183315.0000) 2006/06/01
 17:35:19.99 (1149183319.9900) i4 m100 t19 len2064
NP1.HHZ.ZZ.01 1 i4 500 100.0 2006/06/01 17:35:20.00 (1149183320.0000) 2006/06/01
 17:35:24.99 (1149183324.9900) i4 m100 t19 len2064

where
"1" is the pin number (obsolete)
"i4" means that the data is four-byte integers in Intel byte order. "s2", for example, would indicate two-byte, Sparc order
"500" means there are 500 samples in this packet.
"100.0" is the nominal sampling rate, as advertised by the producer of this packet.
The remaining fields are the actual times of the first and last samples in this packet, in human readable form, and (seconds since 1970).

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