It's possible to send any NFC-compliant data instead of one of the pre-defined types above.

int setCustomData(Record& record)

Note that all of the set options are mutually exclusive. Calling NFC.setCustomData() will clear any NFC.setText(), NFC.setUri(), etc..

The maximum size is 988 bytes for a single record. Adding multiple records will add some additional overhead for each NDEF message, 2 - 4 bytes, plus the length of the data.