OPC UA Client/Server Subscription Concept|OPC UA Standard|Forum|OPC Foundation

Hi

The OPC UA Client/Server Subscription Concept says that a client can subscribe to different types of information provided by an OPC UA server. Information like changes of variable values or events of objects. But is there an intention to notify status changes? For example, if a variable changes from “Good” to “BadNotReadable” the client should be notified. Is there such a thing like StateNotifier? I cannot find any documentation about this. Has anyone already implemented this or knows where to find the documentation?

Thanks for your support