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Is it possible you paired with the OS first? The way Web Bluetooth works it actually works a lot better if you don't pair first.
I didn't originally, and Web Bluetooth didn't work. Then I tried pairing it with the OS to see if it could pair (it could), and if it made the Web Bluetooth work (it didn't - Web Bluetooth couldn't even see the Bangle then). Then I unpaired it from the OS, and the Web Bluetooth still didn't work (but could see the Bangle again)
I'd expect that a Bluetooth 5.1 adaptor would be fine, but it does sound like there's
something odd going on there. Have you got the latest drivers installed for it?I upgraded the drivers to see if that made any difference - it didn't.
I downloaded Opera (which apparently supports Web Bluetooth as well) to see if I could get it to work with that (in case it was a Chrome problem), but I must be doing something wrong with that as well, because that just comes up with an error when I press 'Connect' - it doesn't even get as far as Chrome does. I don't seem to be the only person who has problems with Opera and Web Bluetooth, but I couldn't find a solution which worked, so I gave up on that.
I'm totally baffled. I'm an IT person, and a programmer, but I don't have much experience with Bluetooth except as a user, so I don't know where to start debugging... If it was an Ethernet/IP connection problem, I'd be in there with Wireshark, but I don't know if there's an equivalent for Bluetooth.
Is there anything I can upload to the Bangle to tell me more information about the Bluetooth connection which may help diagnose this? I seem to be able to connect to it fine from my Android phone, so I should be able to upload an app from that even if I can't really do development on it.
Would downgrading the firmware to 2v04 (if I can figure out how) be worth trying?
Is it possible you paired with the OS first? The way Web Bluetooth works it actually works a lot better if you don't pair first.
I'd expect that a Bluetooth 5.1 adaptor would be fine, but it does sound like there's something odd going on there. Have you got the latest drivers installed for it?