Question: Asynchronously update value for datasource-variables?

[pboettch]

I have an existing device which exposes sensor data via various protocols. We now would like to add an OPC-UA-server.

We have a nodeset and basic understanding of how OPC-UA works. (There is still some confusion of Nodes vs. Objects, but that's another story).

The process which runs the open62541-server receives sensors-data updates via IPC-messages asynchronously within a thread different from the main one.

How should I inform the server that there is a new values available?

Can I do it from my thread with UA_Server_writeValue() (is the server thread-safe)?

If a datasource-variable is the right way, how do I inform the server that there are new values available? How will it inform client which are subscribed on this variable clients?

Thanks in advance for your help - I hope I didn't mix up things.

• open62541 Version (release number or git tag): master-branch
• Other OPC UA SDKs used (client or server):
• Operating system: Linux
• Logs (with UA_LOGLEVEL set as low as necessary) attached
• Wireshark network dump attached
• Self-contained code example attached
• Critical issue