Trying to use simtrace with 4FF NFC/SIM cards

Harald Welte laforge at
Wed Mar 1 12:16:53 UTC 2017

I think the best way to analyze this is to understand the exact voltage,
clock rate and Fi/Di values your card is operating on on the working
reader(s).  Most likely at least one of the parameters is different on
the non-working readers.

You should be able to figure all the related values out if you talk
CCID directly to the USB device, or extend / "hack up" the ccid driver
you're using.  Alternatively, an oscilloscopse should also be able to
tell you related information.


- Harald Welte <laforge at> 
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

More information about the simtrace mailing list