Re: [apps-discuss] SenML

["Kaebisch, Sebastian" <[e-mail]>]

Dear Yusuke,

> > 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);

You are absolutely right, both implementations are possible. My intention was only to point to the processing overhead in "encode_exi_float" (bringing float to mantissa-exponent representation) which can be avoided if we are only working with the mantissa-exponent representation all the time and state this in the senML XSD as well. I have only the very restricted microcontrollers in mind.

Best regards
Sebastian