Hi icephyr,

I'm far from a Zephyr BLE expert, but I had this process in mind what could be a solution.

As Nordic doesn't store a public BLE device address in flash I would try to implement the following steps:

• store the public address in Nordic's UICR (http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fuicr.html), Example of writing via nrfjprog,  nrfjprog --memwr 0x10001208 --val 0xffffff00    See/search also the Nordic Dev zone for how to do read/write from UICR, eg. https://devzone.nordicsemi.com/f/nordic-q-a/18257/how-to-write-data-to-uicr-customer-registers
• not sure if this is the best implementation (place to add in code), but you could add to the hci_init() function (subsys/bluetooth/host/hci_core.c), see bt_setup_id_addr(), if no public address is set, to readout here the UICR (NRF_UCIR) as public address instead of the random address.

Good luck.

Best regards,
Frank