code: def request(self, req_mode=0x26):
          
          error = True
          back_bits = 0
  
          self.dev_write(0x0D, 0x07)
          (error, back_data, back_bits) = self.card_write(self.mode_transrec, [req_mode, ])
  
          if error or (back_bits != 0x10):
              return (True, None)
  
          return (False, back_bits)
docs: Requests for tag.
          Returns (False, None) if no tag is present, otherwise returns (True, tag type)