Bangle.js 2 app loader connection issues

I may put a PR in for the documentation to add that note somewhere.

Yes, please do! There's also the wiki...

This is expected at the moment. But... while the Bangle can only have one incoming connection at a time, generally Web Bluetooth webpage can 'share' the connection even when the phone is already connected (on Android, Windows, Mac OS, etc). I believe the issue is the WebBLE app isn't allowing you to select pre-connected devices.

I just filed an issue at https://github.com/daphtdazz/WebBLE/issues/49 and maybe David (the developer) will be able to do something to get it working - but he is pretty busy at the moment so I wouldn't expect anything soon.

Do you know if this applies to apps as well? Like if I've got a Bangle app that's using the bluetooth connection, will I no longer receive push notifications until I exit the app and re-pair it to my phone?

It depends what the app is doing... Bangle.js can have one incoming and one outgoing connection at a time. So you can have it connected to an iPhone and a bluetooth heart rate monitor for instance (or scanning for devices) and everything is fine.