async API for subscription data changes instead of callbacks

[bgusach]

Hello,

I've recently ported a somewhat complex code base from the old opcua library to asyncua, and while it definitely feels way better now, there's one itchy point that doesn't feel completely right: subscriptions still work with callbacks. This forces me to pass certain callbacks through a couple of APIs until I can attach it to the SubHandler.

I'm by no means a specialist, but I think it could be possible to await some coroutine method on Subscription. I think reducing callback complexity is one of the main reasons for the whole asyncio shebang.

Would that make sense? Thanks.

[oroulet]

Yes that make sense. Now i remember that also was part of the original plan, but either there is undocumented code somewhere or we just forgot it in the meantime....
Almost like I want to have a look.... But feel free to try and post something