>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 
   SAK (SEL_RES): 00
=> nil
>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 9c  f8  99  1f  00  00  00
   SAK (SEL_RES): 00
=> nil
>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 
   SAK (SEL_RES): 00
=> nil
>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 9c  f8  99  1f  00  00  00
   SAK (SEL_RES): 00
=> nil
>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 
   SAK (SEL_RES): 00
=> nil
>> p n.poll_mifare
(NFC) ISO14443A Tag
 ATQA (SENS_RES): 04  00
    UID (NFCID1): 9c  f8  99  1f  00  00  00
   SAK (SEL_RES): 00