JS execution appears to hang while BLE characteristics are subscribed

[bobrippling]

Description

If I have my phone subscribed to a BLE characteristic (such as HRM notifications), when I hold the reset button on my BangleJS2, the "loading dialog" appears but the watch then hangs until I terminate the BLE connection

Repro steps

• Install widhrmadv
• Tap the widget to enable HRM adverts
• Connect a phone and have the phone subscribe to the HRM BLE notifications (e.g. set the watch as a sensor in Strava)
• Once the phone is confirmed to be recieving HRM notifications, reset the watch via the hardware button
• Observe that the watch hangs until the phone disconnects BLE

I've looked through the code but can't find any potential wait-loop in the reset code, perhaps I'm looking in the wrong places though

[gfwilliams]

I just tried this on a watch with the NRF Connect app connected and displaying updates from the characteristic and it seems to work and reload just fine.

Do you think you could give it a go with that app?

Maybe also try turning on the debug logging and see if anything gets displayed.

It's possible that the Strava app detects the UART characteristic and is actually also sending some characters there that are causing it to halt?

[bobrippling]

Strange - I can't reproduce it with NRF Connect. I'll see if I can get any further but I'll close this for now. Thanks for the suggestions - might be a UART thing like you say!