[rrd-users] RRD and Respironics Smart Card

Andy Riebs andy.riebs at hp.com
Tue Apr 22 19:34:38 CEST 2008


"some form of rrd" isn't necessarily the same as "some form of Tobi 
Oetiker's creation."  It's more likely that your card uses (and returns) 
some form of circular buffer scheme -- this might also be called "some 
form of round-robin database."


On Tuesday 22 April 2008 01:17:08 pm Chris wrote:
> Hi Fabien,
> Sorry, I have to ask...
> So, how is your weight affected when you 'rrdtool dump'?
> Granted, there is the possibility that the .bin file is
> not using Tobias Oetiker's algorithms.
> But why would Respironics reinvent the wheel?
> Respironics' smart card system is younger than RRDTool.
> Others on my preferred list about cpap machines have suggested
> the likelihood that the file is some form of rrd.
> I suspect its encrypted and/or compressed.
> I'm looking for suggestions or pointers about how to unlock and
> dump such a file. Any help will be greatly appreciated.
> Chris
> -----Original Message-----
> From: rrd-users-bounces at lists.oetiker.ch
> [mailto:rrd-users-bounces at lists.oetiker.ch] On Behalf Of Fabien Wernli
> Sent: Tuesday, April 22, 2008 11:10 AM
> To: rrd-users at lists.oetiker.ch
> Subject: Re: [rrd-users] RRD and Respironics Smart Card
> On Tue, Apr 22, 2008 at 09:45:59AM -0400, Chris wrote:
> > I'm pretty sure the data is in some form of round
> > robin database for a number of reasons:
> > a. the data record on the smartcard
> >    is always the same size: 32KB.
> > b. the old data rolls off when the card
> >    is full, and new data continues to record.
> My weight is constant, thus it is in rrdtool format
> \o/
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Andy Riebs,  HP High Performance Computing Linux R&D
             Technology for better business outcomes
Linux Software,      <http://www.hp.com/go/clusters>
Catalyst Program,   <http://www.hp.com/go/catalysts>
My opinions are not necessarily those of HP
(w) +1.603.884.1521, andy.riebs at hp.com
(h) andy at candooz.com              (Data are not is.)

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