Hi,
@Bufger , on the watch question, I got libre/mm/xdrip+ running fine with a 100 quid LG K8 phone and a Fossil Explorist watch, so I've not really kept up with what's been going on with other watches.
These links might throw more light on it.
A useful guide for setting it up, with some stuff about which watches will work as collectors without a phone (ticwatch and finnow q1 pro seem to work too as they are basically small phones in watch shape):
https://github.com/jamorham/xDrip-plus/blob/master/Documentation/WatchGuide.md
The xDrip+ issues page, there's a few posts about issues getting Sony smartwatch and Samsung phones to play nicely (Samsung phones have notoriously quirky bluetooth implementation, xDrip+ is coded to say "Buggy Samsung - using workaround), so you might not be in heaven with your S9:
https://github.com/NightscoutFoundation/xDrip/issues
The lead developer's JamOrHam, gitter site, where the developers and others discuss uber-geeky technical aspects of it all, they seem to be happy enough answering questions, I've seen a couple of folks from this site posting on it:
https://gitter.im/jamorham/xDrip-plus
On the libre2 question, this is all a bit up in the air at the moment.
Libre2 is not full on cgm, it just makes the new reader ring/vibrate if you go out of range, then you need to scan it to see what the number is. It has bluetooth in it to let it do that. But that's all it does.
Marek Macner in Poland has managed to get data out of it to Spike (ios version of xdrip) using his home-made T-mini transmitter, and has posted saying he's only been at it for a month and there's still work to do to be certain about the accuracy of it.
That gives some reassurance that the encryption issue is maybe not that big a deal but who knows at the moment.
What we're bricking it about at the moment is if they start prescribing just libre2 and it turns out that we can't get it running to xdrip through either mm or the native libre bluetooth. Marek at least getting data out of it suggests this is do-able but it's very much wait and see just now.
Here's an article about Marek getting data out of it:
https://www.deebee.it/?p=16598