What is the practical advantage of UID ASCII Mirror feature of NTAG21x?

[vanlil]

Hi,

I've played around with UID ASCII mirror feature of NTAGs and it works in my applications. Basically you create a placeholder ("&uid=00000000000000") in e.g. a URL as an NDEF record, the placeholder gets overwritten with the UID of the tag at a specified page/memory location on reads.

But: you could always read the UID of the tag, then create a URL which includes the UID (e.g. with BASE64 even with less characters than the decimal output of UID ASCII Mirror).

Is UID ASCII mirror only to save this first read-process (getting the UID of the tag)? Does it provide any other advantage? Did I miss something?

Thanks!

[Jonathan_Iglesias]

you are correct in this on your last statement but also it helps that some devices can retrieve the UID and also you can use the fast read command if needed. 

 this is explained in the DS section 8.7 https://www.nxp.com/docs/en/data-sheet/NTAG213_215_216.pdf

BR

Jonathan