[cups.development] notify-user-data question

[Jerome Alet]

Hi there,

does someone have working client side C code which creates a subscription 
containing something in the notify-user-data IPP attribute ? 

in particular, I don't really understand what "binary datas" means when
reading the documentation : it seems that the '@' is considered 
as being binary datas which need to be specially encoded 
(hexadecimal between < and > brackets), and CUPS 1.2.x sources don't seem 
to contain any client side code (or example) to create subscriptions
with this attribute set.

TIA

Jerome Alet