Re: [apps-discuss] SenML

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

Dear Yusuke,

thank you for your mail.

> > 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.


> > 3) use restriction definitions of strings (define maxLength or list all
> possible values as enumeration). Especially using enumerations results in
> a smaller message size and avoids string comparison.
> 
> Enumeration is good idea but I think strict enumeration allows no
> addition in future without breaking backword compatibility. I recommend
> some 'dummy entries' to make room (and show the limit to keep the same
> bitwidth clearly) for future.
> 

If there a need of flexibility, then we should do that. In my understanding, the unit symbol table in 10.1 will be standardized and will be fixed then. 


Best regards
Sebastian Käbisch