bluetooth address : built-in or random ?

Question

Hi
I have read various things about this so I would like to confirm
What is the best way to set the bluetooth address of my device ? Is it built in by nordic ?
Or is it a randomly generated address ?
Or should I set different addresses myself on the production line ?
Thanks
Thomas

Stian Røed Hafskjold · Accepted Answer

You can read about the different address types in this thread: devzone.nordicsemi.com/.../ 
 Under production of the nRF51, a randomly generated address is stored in the FICR->DEVICEADDR registers ( Random Static Address ). They are unique for each device (due to the 2^26 different combinations). You cannot change this register. 
 You can choose to use this address stored in FICR in production, or you can set your own randomly generated address ( Random Static Address ) with the sd_ble_gap_address_set() function (needs to be called every time the SD is initialized). 
 You can also choose to register an address with the IEEE Registration Authority, and you will now have a Public Address . Then, you would also need to set this address along with the address type specification using sd_ble_gap_address_set() every time the SD is initialized

bluetooth address : built-in or random ?

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