Can't use nfc_initiator_poll_target with Sub-B types (B2SR, BI, B2CT)

[lodi-g]

How to reproduce:

• Clone the repository
• Edit lines 104-112 to

const nfc_modulation nmModulations[6] = {
    { .nmt = NMT_ISO14443A, .nbr = NBR_106 },
    { .nmt = NMT_ISO14443B, .nbr = NBR_106 },
    { .nmt = NMT_ISO14443B2SR, .nbr = NBR_106 },
    { .nmt = NMT_FELICA, .nbr = NBR_212 },
    { .nmt = NMT_FELICA, .nbr = NBR_424 },
    { .nmt = NMT_JEWEL, .nbr = NBR_106 },
};
const size_t szModulations = 6;

• Build
• Start examples/nfc-poll

Expected behavior:

./examples/nfc-poll uses libnfc 1.7.1
NFC reader: ACS / ACR122U PICC Interface opened
NFC device will poll during 36000 ms (20 pollings of 300 ms for 6 modulations)
[...]

Actual behavior:

./examples/nfc-poll uses libnfc 1.7.1
NFC reader: ACS / ACR122U PICC Interface opened
NFC device will poll during 36000 ms (20 pollings of 300 ms for 6 modulations)
nfc_initiator_poll_target: Invalid argument(s)

This is IMHO related to #257 .
Same background infrmations as #257.

[lodi-g]

After further investigation it appears this bug happens whenever you use a sub-b type:

• B2SR
• B2CT
• BI

Probably related to #439?

---

I use an ACR122U, thus the driver is acr122_usb and the chip is a pn53x (confirmed by running nfc-list with LIBNFC_LOG_LEVEL=3).

It looks like the PN53X doesn't support Sub-B tags?

[lodi-g]

@doegox Maybe would you happen to know something about that?

So far what I'm doing is an ugly is_tag_present function which is called every 750ms. :(