Gotcha - I find that frustrating too. At the moment that's not part of the Web Bluetooth spec, but it would make a lot of sense if they could add something... I guess you could try hassling the team at Google that's working on Web Bluetooth?
Honestly if you're targeting iOS specifically you might be better off writing your own app - or I don't know @daphtdazz's availability, but he might be available for contract work to create you a custom app based on WebBLE that allowed persistence?
I can't speak for him, but I'd imagine that adding non-spec-compliant stuff to the app for free might not really be in his best interests :)
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