I'm working on LE privacy modes. I reviewed The soft device from nordic and
also zephyr and have the following proposal
Privacy API proposal
1. a config for address mode
* Identity.
* NRPA
* RPA
2. A address timeout to rotate NRPA/RPA
Initialization -
The default mode will be Identity addressing:
* If you are configured for identity address mode, the host code will try
to get the identity address from the controller. If it gets the identity
address it will use it
* If that is unavailable it will checks its NV storage for a static private
address. If it gets one, it will use it.
* If that is not found, it will generate a static private address and store
it in the NVRAM.
If you are configured for NRPA or RPA, they are used for all scans, advertising
and connections. The host stack will use the controller for RPA generation
and decoding.
The host will keep a non volatile key-cache for IRK that has a configurable
size. At boot, these will be loaded into the controller. Whenever a new key
is retrieved in bonding, it will be added to the NVM and to the controller.
Comments please. I don't have a lot of experience here and any advice would be
appreciated.
One observation. The Zephyr stack seems to always use random addresses for
active scans. Do we want to do the same?
