Ok, just to make sure I understand this correctly.

- This is basically a commercial smartwach (the Colmi P8) that is based on a well documented SOC, the nordic nRF52832

- The open source version comes with an enclosure that is not glued shut, so that it is easy to access testpoints on the pcb.

- Development is done by accessing the nRF51 SWD interface with pogo pins or similar. The programming interface can be a standard SWD interface such as an STLink clone

Ok, sounds easy enough. It should be possible to just buy one of those smartwatches and crack them open? But OTOH the developer version is not much more expensive.

The main question is now: What software to run on it, that goes beyond a few experiments? Is there any kind of open source smartwatch OS that would run on this?

Edit: Corrected typo, of course I meant SWD interface, not SWM. (SWM or rather SWIM is for STM8)