Espruino on your watch!

looks like scl:13 or/and sda:14 is not used for I2C on this device.

could be some mistake on my part, will double check but this is what I got from register dump when running the firmware and stopping it in gdb over swd https://github.com/fanoush/ds-d6/wiki/Hardware

0x40004500: 0x00000005
0x40004508: 0x0000000d
0x4000450c: 0x0000000e
0x40004524: 0x06680000

which I guessed is TWI1 with scl 13 sda 14 speed 400kbps
as per https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Ftwi.html&cp=2_1_0_48_7_5&anchor=register.PSELSCL

Check i2cdetect for a simple scanner

Thanks a lot, this is what I was looking for :-)