blob_buf_init(&du->buf, 0);
memset(&du->req, 0, sizeof(du->req));
ret = ubus_invoke_async(ctx, du->obj, du->func, req.head, &du->req);
blob_buf_init(&du->buf, 0);
memset(&du->req, 0, sizeof(du->req));
ret = ubus_invoke_async(ctx, du->obj, du->func, req.head, &du->req);