nRF52840 SDK16 - Advertising Device's Address (MAC address)

RE: nRF52840 SDK16 - Advertising Device's Address (MAC address)

Nikosant03 — Fri, 02 Oct 2020 05:18:48 GMT

Thank you for your support haakonsh!!

RE: nRF52840 SDK16 - Advertising Device's Address (MAC address)

haakonsh — Thu, 01 Oct 2020 14:05:22 GMT

Nothing in FICR will change during the lifetime of the product. Our examples use the address in FICR, if you do not explicitly use another address you won't have to worry about.

RE: nRF52840 SDK16 - Advertising Device's Address (MAC address)

Nikosant03 — Thu, 01 Oct 2020 09:13:07 GMT

Thank you from your responce Haakonsh

[quote userid="13562" url="~/f/nordic-q-a/66551/nrf52840-sdk16---advertising-device-s-address-mac-address/272440#272440"]It is in fact the DEVICEADDR[n], randomly generated and stored in FICR in production[/quote]

Is there any case the device address asigned during production to be changed radomly by the SDK/soft device or it remains the same during the life cycle of the product? I want to ensure that the MAC address won't change during the life cycle of the product.

RE: nRF52840 SDK16 - Advertising Device's Address (MAC address)

haakonsh — Thu, 01 Oct 2020 07:55:27 GMT

[quote user=""]1. The Static Random Address is a randomly generated address and is preprogrammed before the device is shipped?[/quote]

It is in fact the DEVICEADDR[n], randomly generated and stored in FICR in production. It is used by the SDK by default, but you can use your own randomly generated address as well.

[quote user=""]2. If the user do not change the device address, it will remain the same until the end of life time of the product or it is possible to change in a random time?[/quote]

You can change it, but be careful of what dependencies you create on your product ecosystem. If your devices, or someone else's device who interface with your device, use the BLE address as the filter during scanning it might cause you trouble if you change your BLE address. You can ofc filter on device name, UUIDs, manufacturer ID, etc.

You can also change from Random Static to a Random Private address if you want. There's nothing in the spec that prevents you, but it will require that you re-start the SoftDevice/terminate any ongoing connections.