asyncua vs. opcua question

[rhb327]

I'm working on an embedded Qt design that will interface with Emerson's DeltaV system via OPC UA. On the embedded side I have a python OPC UA server based on either opcua or asyncua and I have a OPC UA client in the Qt user interface application. I'm trying to select between these two libraries noting the following:

• asyncua seems to be the newer library and the primary path into the future (true?)
• opcua seems to have more development maturity to support OPC UA alarms, events and methods which I'm interested in supporting

Assuming the above are true, would you have a specific recommendation of which library would be best to use this design?

Thanks!
-Rich

[swamper123]

Hey ho,

• opcua-asyncio is the actual and primary repo. python-opcua is in maintainance mode (and probably will be for a long time)
• everything that python-opcua can, should be possible with asyncua as well (afaik we have a sync wrapper, which should deal with that. Haven't tested that, since I am mostly using the async way). Asyncua has Events and methods already implemented (see the example folder). OPC UA Alarms are not implemented yet, but is in our work in progress list.

Just a hint, FreeOpcUa has a OPC-UA GUI client as well, containing PyQT5.

[oroulet]

and also if you want to do "real" embeded system, then python (and QT) is not the right language. you have an open source opcua in C project on github too.