[rrd-users] RRD and Respironics Smart Card

Chris chris at montfordhouse.com
Tue Apr 22 19:17:08 CEST 2008

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.


-----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


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