[rrd-users] RRD and Respironics Smart Card

[Andy Riebs]

Chris,

"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."

hth!
/andy

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>
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My opinions are not necessarily those of HP
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(h) andy at candooz.com              (Data are not is.)