Read Access Address from the SoftDevice after connection establishment

RE: Read Access Address from the SoftDevice after connection establishment

ovrebekk — Wed, 07 Jul 2021 12:52:52 GMT

This is not provided out of the box unfortunately, for the reasons I mentioned earlier.

If you use the Bluetooth stack in Zephyr you could always make your own fork of the open source Bluetooth controller, and make the changes needed to give the application access to the access address. This is not an easy task though, so I would strongly recommend trying to find some other way to accomplish your goal if possible.

Best regards
Torbjørn

RE: Read Access Address from the SoftDevice after connection establishment

Sarailoo — Tue, 06 Jul 2021 14:53:02 GMT

Hi
Thank you for your answer
I'm doing some research and the reason I need the access address is that I have to run the Channel selection algorithm 2 in a controller after all masters advertise their channel maps to the controller and the algorithm needs access address and channel map.

RE: Read Access Address from the SoftDevice after connection establishment

ovrebekk — Tue, 06 Jul 2021 13:48:32 GMT

The access address is randomly generated for every connection, and the Bluetooth link layer doesn't expose this address to the higher levels of the Bluetooth stack, or to the application.

Essentially an application running over Bluetooth shouldn't need to know what access address is used, and for this reason it is not exposed outside the SoftDevice.

Is there any particular reason you need to know the access address?

A Bluetooth sniffer should be able to pick up the access address if you run it during connection establishment.

Best regards
Torbjørn