We use our own networking library at the present. There isn't a clean way to describe what we've done.
But.
Before we went and did that, I had an update notification thing for Onlink, back when releases were labeled like Beta4b. I did this by checking my server for a file using HttpGetFile in the tcp4u library. It's not a great solution if you plan to do much more than this, but it's a start if that's all you're planning.
In all I don't suggest relying on tcp4u, I only mention it because it's already built into what you have.
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