auth fails when scarddisconnect not used

[simeranya]

Hi all,

I am experiencing weird behaviour when working with DESFire cards.

I perso a card with a PCSC reader in the following order.

scardreset
auth the card
- AA00
- AF.....
reset memory
create app
...

Then I do not remove card from the field and try to perso card again but this time auth(AF.....) fails with AE response.

Then I added scarddisconnect to my code, now it is authenticating successfully in second and all other attempts.

scarddisconnect
scardreset
auth the card
- AA00
- AF.....
reset memory
create app
...

Does anyone know why it requires card to be disconnected after first try ?

thank you in advance

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[TapLinx Support]

Hi Simeranya,

This strange behavior could also come from the reader or the reader driver respectively. Some drivers try to find out which card is in the field and do some tests. If you do not remove the card, some artifacts might be remaining in this case.

The TapLinx team

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