Hi,

I've been testing the NFC sim with oscilloscope with this results:

- I use the new Omnikey 3121 reader, it was able to read the sim card. Vcc = 5V, Vpp = 3V, CLK = 5 Mhz.

- I try again to read same sim card with SCR 3310, but no way to do it; no green LED, Vcc = 0. I check with an old GRcard SIM, Vcc = 5V, Vpp = 0V, CLK = 5Mhz.

As SCR 3310 reader is unable to read this NFC sim cards, could be because are not implementing OpenCard Framework API (implemented only by Omnikey reader) ?

After test with both readers, I get back to iPhone:

- Using the sim card without simtrace: Vcc = 1.8V, Vpp = 0V and 5Mhz CLK.

- simtrace w/ iPhone SE:
* only 2 times wasn't unable to recognize the sim card ("NO SIM card" message), that I guess could be mechanical problems due to wires, cables and so on.
* when was able to read the sim, Vcc is always 3V (as in specs), Vpp = 0V and CLK 5 Mhz, but never was able to trace; or just nothing after "ATR APDU:" or gets stuck after a few very strange lines in which bytes CLA doesn't make sense:

APDU: 00 00 04 b0 00 ff ff
APDU: 02 90 00 00 a4 00 04
APDU: 02 a4 6f 07 61 22 00
APDU: c0 00 00 22 c0 62 20

Looks like order or synchronization is lost, as you can see a regular APDU highlighted between two lines. Could be this issue related with the T=0 implementation?: "Unfortunately, the Rx Timeout feature of the USART is not working in T=0 mode, so I had to re-implement Rx timeout (waiting time) handling by means of the TC (timer/counter) block 0. Due to technical limitations, we will wait up to one byte (12 etu) more than we should."

Regards,

Pedro

2017-03-02 21:30 GMT+01:00 Pedro Cabrera <pedrocab@gmail.com>:

Before proceed with oscilloscope, I do a last test using simtrace and a Samsung Galaxy S3 with this UICC and surprisingly it works, so I have the ATR APDU: 3b 9f 96 c0 0a 3f c7 a0 80 31 e0 73 fe 21 1b 65 d0 01 74 0e a1 81 0f 9c

From there; Fi=512, Di=32, Protocol T=0, class accepted by the card: A, B and C (https://smartcard-atr.appspot.com/parse?ATR=3b9f96c00a3fc7a08031e073fe211b65d001740ea1810f9c)

After this, I test over and over again with the same UICC card and an iPhone6 but never got ATR response, just got "ATR APDU: " and iPhone don't recognize SIM card. SCR3310 reader never recognizes the card, always "Card state: Card inserted, Unresponsive card" response.

I test simtrace/iPhone6 and SCR reader using same UICC type from other operator with same results (but working with simtrace/S.Galaxy S3)

Regards,
Pedro

2017-03-01 13:16 GMT+01:00 Harald Welte <laforge@gnumonks.org>:
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.

Regards,
Harald

--
- Harald Welte <laforge@gnumonks.org> http://laforge.gnumonks.org/
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