Re: OPC UA Device Support - Limit in the number of PVs

[Ralph Lange via Tech-talk <tech-talk at aps.anl.gov>]

What is your server?

That looks like a limitation on the server side, either on the total number of items per session or per subscription (I know a few servers doing that) or on the number of items per OPC UA service call (e.g., Siemens S7 has a limit of 1000) or on the number of registered items (I know a few servers doing that).

Getting BadConnectionClosed means that your server probably closed the connection after it found you were going over its limits. Brutal but not unheard of. (It's a simple way to avoid DoS-type attacks.)

If the item is not connected, any processing that leads to a conversion of a value to an unknown OPC UA type will fail - these are follow-up errors.

If you think the error message should be improved, please open an issue in the GitHub project.

Cheers,
~Ralph