FYI, im seeing empty transaction history on my mastercard with this PR's changes, shows fine without. not sure where exactly the issue would be, dont see any changes related to transactions at a first sweep through the diff...

either way great work, looking forward to this :)

i was able to get transaction history to work again for my mastercard by reverting the emv_poller_read_afl() function to its state before this PR. i found this by looking at logs, stripping out most of them and looking for the SFI attempts, this is what I see:

working (gets transaction history) (dev branch):

[T][EMVPoller] SFI 0x2 record 1:
[T][EMVPoller] SFI 0xB record 1:
[T][EMVPoller] SFI 0xB record 2:
[T][EMVPoller] SFI 0xB record 3:
[T][EMVPoller] SFI 0xB record 4:
[T][EMVPoller] SFI 0xB record 5:
[T][EMVPoller] SFI 0xB record 6:
[T][EMVPoller] SFI 0xB record 7:
[T][EMVPoller] SFI 0xB record 8:
[T][EMVPoller] SFI 0xB record 9:
[T][EMVPoller] SFI 0xB record 10:

broken (no transactions info) (pr head):

[T][EMVPoller] SFI 0x2 record 1:
[T][EMVPoller] SFI 0x4 record 1:
[T][EMVPoller] SFI 0x4 record 2:
[T][EMVPoller] SFI 0x4 record 3:
[T][EMVPoller] SFI 0x4 record 4:
[T][EMVPoller] SFI 0x2 record 2:
[T][EMVPoller] SFI 0x3 record 1:

@Willy-JL Thank you! the problem was that the attempt to brute force files 2-3 was before reading transactions. Some cards, after attempting to read a record that does not exist on them, refuse to respond to subsequent requests. this seems to be done for security reasons

@wosk thank you for the productive collaboration!

can confirm the transactions work again, thanks!