[rrd-users] RRD and Respironics Smart Card

[Andy Riebs]

Chris,

Distinctive features of rrdtool that might indicate whether your 
Respironics card is using rrdtool include

1. Consolidating data over a variety of time periods. Does the card simply 
return data for the last 30 hours, for example, or does it return data by 
hour, day, and week?
2. Does it generate cool, and very distinctive, graphs like rrdtool?

/andy

On Tuesday 22 April 2008 02:06:41 pm Simon Hobson wrote:
> Chris wrote:
> >Granted, there is the possibility that the .bin file is
> >not using Tobias Oetiker's algorithms.
> >But why would Respironics reinvent the wheel?
>
> Why wouldn't they ? There are many reasons : having a proprietary
> format that isn't readable with other tools might be a design goal;
> not using anything 'tainted' with an open licence might also be a
> requirement; just plain "we know better" attitude; not knowing about
> rrdtool; not running a system suitable for running rrdtool - so
> there's a few options for you, the list is by no means complete.
>
> >Respironics' smart card system is younger than RRDTool.
>
> So ? rrdtool does not have a monopoly on fixed size circular buffer
> schemes.
>
> >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.
>
> Detective work is needed.
>
> I'd be surprised if it was encrypted as this would make updates
> unneccessarily complex and processor intensive.
>
> So, hexdump the file and take a peek - try and figure out what format
> it's in. You can do the same with an rrd file and compare - the
> difference being that you can make custom rrd files, and experiment
> with inserting known data into them (and I imagine that Tobi probably
> has a file spec somewhere).
>
> That's probably as much help as anyone on this list can give you.
>
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Andy Riebs,  HP High Performance Computing Linux R&D
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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.)