NRF52: Use with MCU_LFCLK_SOURCE: LFRC

Hi, I want to use Nimble on a NRF52832 board which does not contain an external low frequency crystal (LFXO) - specifically, I want to build InfiniTime for a P8 smartwatch variant. To generate the low frequency clock, a signal can either be synthesized using the internal high frequency clock (LFSYNT), or it can be derived from an integrated RC clock (LFRC): https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fclock.html .

Using LFSYNT works great, however I would like to use the RC clock (LFRC) due to the high energy usage of the high frequency clock. Unfortunately, Nimble does not function correctly in this mode. Although it does advertise itself via BLE, no connection can be established.

The documentation at https://mynewt.apache.org/latest/network/ble_setup/ble_lp_clock.html does not mention the RC clock anywhere. Is this an unsupported mode? How could I enable this mode? Is these any example code which is known to be working in this configuration? Thanks for any help.

Start with the BLE low-power clock documentation linked in the issue and inspect the NRF52832 clock configuration for the MCU_LFCLK_SOURCE: LFRC path. Determine whether LFRC is supported and what prevents connections while advertising; done means documenting a working configuration or clearly identifying the missing support and providing a reproducible example.

Written by the indexing model from the issue text.