code: def read_transport(self):
          
          if ('r' not in self.access_type):
              raise BTIncompatibleTransportAccessType
          return self.codec.decode(self.fd, self.read_mtu)
docs: Read data from media transport.
          The returned data payload is SBC decoded and has
          all RTP encapsulation removed.
  
          :return data: Payload data that has been decoded,
              with RTP encapsulation removed.
          :rtype: array{byte}