Setting resolvable private address

RE: Setting resolvable private address

Ole Bauck — Thu, 29 Sep 2016 12:31:52 GMT

To update the RPA every 15 minutes you have to use a timer, for example the app_timer module. There is no min or max interval (that I found at least), only the recommended.

RE: Setting resolvable private address

Amit Chahar — Thu, 29 Sep 2016 12:00:03 GMT

So, RPA refresh has to be done in my code using timer ? There is nothing compulsory to set in softdevice for it? Is there any minimum interval (beside the recommended) to refresh the RPA?

RE: Setting resolvable private address

Ole Bauck — Thu, 29 Sep 2016 10:45:11 GMT

Hi,

This is the correct and valid way.
The recommended for updating the address is 15 minutes as specified in the Bluetooth core specification 4.2 Vol 6 Part B Chapter 6.1:

6.1 PRIVATE ADDRESS GENERATION INTERVAL

A private address shall be generated using the Resolvable Private Address Generation (see Section 1.3.2.2).

The Link Layer shall set a timer determined by the Host. A new private address shall be generated when the timer expires. If the Link Layer is reset, a new private address shall be generated and the timer started with any value in the allowed range.

Note: If the private address is generated frequently, connection establishment times may be affected. It is recommended to set the timer to 15 minutes.

This can also be found in the SDK: BLE_GAP_DEFAULT_PRIVATE_ADDR_CYCLE_INTERVAL_S