Hi Andrew,

> > So I re-read that part of the spec, and I can see why we might want it.
> > However, this quote seemed rather interesting: "Le set to '00' indicates
> > that the terminal expects to receive at most the maximum number of bytes,
> > i.e. 256, in the response ADPU. The UICC may return any number of bytes
> > in the range 1 to 256."
> >
> > Shouldn't that 'FF' be changed to '00'?  Also, you might want to include
> > the relevant passage or Spec/Section reference in this code so we don't
> > wonder where it came from in the future.
> 
> Attached patch adds a comment and changes the FF to 00.  I guess it is
> largely theoretical right now.  The issue again with "any number of
> bytes in the range 1 to 256" is that this prohibits an empty response,
> which we want to allow too :)   Maybe this should be a parameter of
> driver->envelope()

"The maximum number of bytes expected in the data part of the response APDU is 
presented in the parameter Le, which is optional. This means that if the 
terminal does not expect any data in the response APDU Le is absent from the 
command"

The question really becomes, do we actually want a response and know what to 
do with it?

Regards,
-Denis