Re: [apps-discuss] SenML

[DOI Yusuke <[e-mail]>]

Dear Sebastian,

From: "Kaebisch, Sebastian" <[e-mail]>
Subject: RE: [apps-discuss] SenML
Date: Wed, 14 Mar 2012 10:50:57 +0100
> > > 2) instead of using a "float" value, I would recommend to use the
> > "mantissa" and "exponend" representation. A floating value is always a
> > challenge for constrained devices because of its inefficent processing.
> > 
> > I think float values in EXI is already mantissa and exponend (base 10).
> 
> That's right, however, EXI has to convert the float value into the mantissa and exponent representation (encoding) and vice versa (decoding) respectively. This processing overhead can be avoided if we working already on data model level only with the mantissa and exponent representation.

I cannot get your point. Do you have specific API or something else in mind?

I think both is possible and some library for constrianed devices may
implement something like the latter.

1) encode_exi_float(EXI_STREAM *out_stream, double f);
2) encode_exi_exp(EXI_STREAM *out_stream, int mantissa, int exponent);

Thanks,

Yusuke