Function at_closesocket

components/net/at/at_socket/at_socket.c:555–587

}

int at_closesocket(int socket)
{
    struct at_socket *sock = RT_NULL;
    enum at_socket_state last_state;

    /* deal with TCP server actively disconnect */
    rt_thread_delay(rt_tick_from_millisecond(100));

    sock = at_get_socket(socket);
    if (sock == RT_NULL)
    {
        rt_set_errno(ENXIO);
        return -1;
    }

    last_state = sock->state;

    /* the rt_at_socket_close is need some time, so change state in advance */
    sock->state = AT_SOCKET_CLOSED;

    if (last_state != AT_SOCKET_CLOSED)
    {
        if (sock->ops->at_closesocket(sock) != 0)
        {
            free_socket(sock);
            rt_set_errno(EIO);
            return -1;
        }
    }

    free_socket(sock);
    return 0;
}

int at_shutdown(int socket, int how)
{