How to define MonitoredItemService in asyncua Server

[dibyendumca]

Hello,

I need to define some node which should trigger data change notification only when its value is a specific value.
How to implement that in the Server/Client side with DatachangeFilter and AggregateFilter?
Can anyone help me out?

Thanks

[schroeder-]

Don't think there is any way to do this. Only a Deadband is possible, which is not what you want.

Why not filter out the values in our subscription handler?

[schroeder-]

What you mean? The MonitoredItemService class is used by the server to handle subscriptions for clients.

[dibyendumca]

Hello,
OK, I see, Thanks...
I see a feature as described in OPC UA Foundation Website.

How shall I implement this DISCARDING OF OLDEST VALUE feature in asyncua?
Please provide some example.

Thanks

[schroeder-]

I think this is not handled in our server.

[dibyendumca]

Will it be available in the next releases?

[schroeder-]

I don't think so, feel free to implement it and create a pr.