Advance the module with timestep dt

def update(self, dt):
        """
        Advance the module with timestep dt
        """

        method = "update"

        A = None
        metadata = {method: dt}

        send_array(self.socket, A, metadata)
        A, metadata = recv_array(
            self.socket, poll=self.poll, poll_timeout=self.poll_timeout,
            flags=self.zmq_flags)