As far as my experiments show, Events and the like are existing and working. but these are server-only. That is, on event there is a callback that is called, but there is nothing sent to a client. Alarms and Conditions build upon Events, so it's the same. Open62541 has a very strict request/response system, so there is no data sent by the server without a request from the client. At least as far as i found until today. But there is something called a "Data Change Notification". At least in the specs. But i did not find this in open62541. And subscriptions seem to have only the fixed interval method.
I'm trying to understand all that since some months now and did not get that far as i was expected :(
Thanks for your answer :)