code: def _acquire_media_transport(self, path, access_type):
          
          transport = BTMediaTransport(path=path)
          (fd, read_mtu, write_mtu) = transport.acquire(access_type)
          self.fd = fd.take()   # We must do the clean-up later
          self.write_mtu = write_mtu
          self.read_mtu = read_mtu
          self.access_type = access_type
          self.path = path
          self._install_transport_ready()
docs: Should be called by subclass when it is ready
          to acquire the media transport file descriptor