nfctype3: Support blank tag detection in check presence

System code 0x12FC is used to find NDEF in Type-3 tags. In case
of blank tags, tag does not support system code 12FC. So polling
with 0xFFFF system code returns ID if tag is in range.

diff --git a/plugins/nfctype3.c b/plugins/nfctype3.c
index 8f1bfaa..7dbd577 100644 (file)
--- a/plugins/nfctype3.c
+++ b/plugins/nfctype3.c
@@ -668,8 +668,8 @@ static int nfctype3_check_presence(uint32_t adapter_idx,
 
        /* CMD POLL */
        cmd.cmd  = CMD_POLL;    /* POLL command */
-       cmd.data[0] = 0x12;     /* System code (NFC SC) */
-       cmd.data[1] = 0xFC;
+       cmd.data[0] = 0xFF;     /* System code */
+       cmd.data[1] = 0xFF;
        cmd.data[2] = 01;       /* request code */
        cmd.data[3] = 0x00;     /* time slot */