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#1 2020-05-18 03:36:21

Rosco
Contributor
Registered: 2019-12-10
Posts: 43

lf snoop question

lf snoop apparently takes samples the same way lf read does, but with the field off. It runs for a split second and then returns the samples.

Is there any way to make it start recording when something happens (field present, or some modulation happening ideally) or sample and send the graph buffer continuously? Is the USB link fast enough for the latter?

The way it works now, it's just too short to catch the magic moment when the communication I want to catch between the transponder and the reader happens.

FWIW, I'm trying to figure out how the temperature value is transmitted between a Destron Fairing Bio-Thermo implant and a Bio-Thermo-aware reader. The assumption was that it's transmitted in the application bits of the FDX-B telegram, but it's not that simple and something else is happening.

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#2 2020-05-18 13:47:37

marshmellow
Contributor
From: US
Registered: 2013-06-10
Posts: 2,302

Re: lf snoop question

Lookup lf config    threshold option.

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#3 2020-05-18 15:48:03

Rosco
Contributor
Registered: 2019-12-10
Posts: 43

Re: lf snoop question

Thanks! I didn't even think of having a look there... silly me.

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