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typically how much time it takes you guys to update library in-line with OPC UA foundation stack.
Sometimes we're ahead, sometimes we're behind. Milo's stack isn't based on the foundation's stack, it's based on the specs.
> A hypothetical question - How long it may take to come out with Pub-Sub support once OPC UA foundation releases final specs.
I honestly can't answer this. I'll begin working on support 1.04 in Milo more-or-less immediately, which will put all the data structures and node types in place to make implementing PubSub possible.
As far as actually implementing it in a client or server goes... that's more complex. It's definitely something to be done at the SDK level, whether you're talking about Milo or the Prosys SDK. I'm not sure when, or even if, PubSub will make its way into the Milo SDK. If you haven't read the spec for it yet I suggest you do so - it's incredibly complex.
The immense complexity means it's possible it would require more of my time to support people trying to use the implementation than it would to implement it in the first place. Since I'm not being paid for my time or support that doesn't really sound like a great proposition to me :)