@normalexit out of curiosity: Why not a plain debian? What are the benefits of Ubuntu server?

@android I used

adb logcat

and pinned it down to the error message

bta_gattc_mark_bg_conn unable to find the bg connection mask for: […]

It matches well to this espressif issue: https://github.com/espressif/esp-idf/issues/5395
However, I don’t know whether #espressif is involved in #suunto at all…

@android I should mention it paired before the firmware upgrade

@Kanzar Thanks for your advice. I know this link already, but we will try connecting via app once more.

@DAT @christos divide & conquer 😏