code: def write_to_ndef_service(self, data, *blocks):
          
          if self.sys == 0x12FC:
              sc_list = [ServiceCode(0, 0b001001)]
              bc_list = [BlockCode(n) for n in blocks]
              self.write_without_encryption(sc_list, bc_list, data)
docs: Write block data to an NDEF compatible tag.
  
          This is a convinience method to write block data to a tag that
          has system code 0x12FC (NDEF). For other tags this method
          simply does nothing. The *data* to write must be a string or
          bytearray with length equal ``16 * len(blocks)``. All
          parameters following *data* are interpreted as block numbers
          to write. To actually pass a list of block numbers requires
          unpacking. The following example calls would have the same
          effect of writing 32 byte zeros into blocks 1 and 8.::
  
              tag.write_to_ndef_service(32 * "\\0", 1, 8)
              tag.write_to_ndef_service(32 * "\\0", *list(1, 8))
  
          Command execution errors raise :exc:`~nfc.tag.TagCommandError`.