I am implementing a new system using C#/UWP which uses NTAG 21x tags with password protection to store some information. I use different readers from ACS and access them via their PC/SC interface like shown in the following example from Microsoft: https://archive.codeplex.com/?p=nfcsmartcardreader
Read/Write by using the standard commands works fine, but executing the PWD_AUTH (or GET_VERSION/READ_SIG) command is tricky.
Using an ACR122U I could successfully execute them via "Direct Transmit" to the embedded PN532 like explained in here: https://stackoverflow.com/a/44243037/472434
But for the ACR123U I still can't find a solution.
I already found out that this device uses the RC531, but I neither can find similar communication commands for that chip like for the PN532 nor can I find "Direct Transmit" commands for the ACR123U.
Can I somehow execute such native commands with the ACR123U?
Or can I use something like APDU-wrapping like explained here?
Or are there even PC/SC commands available which should perform at least the PWD_AUTH command on NTAG21x tags?