private void sendServerRequest() {
        if(isEnabled()) {
            if (session.isDetached()) {
                Log.debug("Session is detached, won't request an ack.");
                return;
            }
            String request = String.format("<r xmlns='%s' />", namespace);
            session.deliverRawText( request );
        }
    }
Sends XEP-0198 request <r /> to client from server
xmppserver/src/main/java/org/jivesoftware/openfire/streammanagement/StreamManager.java