Hi guys, I am developing a Java library that allows communication with DESFire cards through a Gemalto Prox-Du device, and it turns out that these cards get blocked from time to time. Trying to minimize the problems caused by this fact, I've been asked to include a timeout on each command request that causes a reset if it expires. In order to do this, I turned to the methods included in the ccid library, but due to the absence of a previously created Java interface as is the case for pcsc commands, I've been forced to try to implement it on my own. The problem is that, despite my hard research, I'm not able to find a way to determine the Logical Unit Number parameter that I need to send. May someone give me a clue on how to find it or guide me to a workaround?
Thanks in advance, Francisco Rodríguez Algarra
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