v1.1.8 no longer works with OPC PLC

[daniel-sintef]

Hi Everyone,

I want to use asyncua to connect to the Microsoft OPC PLC demo server via docker.

I have this code which writes to a custom node I have developed:

import asyncio
from asyncua import Client, ua

URL = "opc.tcp://localhost:4840"

async def main():
    print(f"Connecting to {URL} ...")
    async with Client(url=URL) as client:
        print("CONNECTED!")


if __name__ == "__main__":
    try:
        asyncio.run(main())
    except Exception as e:
        print(f"An error occurred: {e}")

On v1.1.6 this works:

Connecting to opc.tcp://localhost:4840 ...
CONNECTED!

But on v1.1.8 it fails:

Connecting to opc.tcp://localhost:4840 ...
ServiceFault (BadServerUriInvalid, diagnostics: DiagnosticInfo(SymbolicId=None, NamespaceURI=None, Locale=None, LocalizedText=None, AdditionalInfo=None, InnerStatusCode=None, InnerDiagnosticInfo=None)) from server received  in response to CreateSessionRequest
An error occurred: The ServerUri is not a valid URI.(BadServerUriInvalid)

I suspect maybe there has been some subtle change in validation that affects my use case? I'm also happy to change how I use the client, but I've been banging my head for some time and can't figure it out.

[daniel-sintef]

Probably linked to: #1865