How does the advertisement filter policy work?

[balaji]

Hi,

How does the advertisement filter policy work?

I tried both BLE_GAP_ADV_FP_FILTER_SCANREQ and BLE_GAP_ADV_FP_FILTER_BOTH, but this doesn't restrict other devices (not in white-list) to find it, while scanning (but avoids connection request).

How can i restrict my device advertisement so that devices in white-list only can see my device is advertising?

Regards, Balaji

[Pål Håland]

Hi Balaji,

It would be an idea to use undiscoverable advertising type, BLE_GAP_DISC_MODE_NOT_DISCOVERABLE. This would restrict other devices from showing it in the UI unless it is already known to them.

If you are using the SDK then you could use this utility function: devzone.nordicsemi.com/.../a00949.html

If not, then you should have a look in the bluetooth specification at Volume 3, part C (GAP) chapter 11. + Assigned numbers: www.bluetooth.org/.../generic-access-profile

All advertising is visible to the peer, and a wrongly implemented peer could list unknown devices without them beeing discoverable.

The only way to "hide" your own address for other devices is to use advertising data that cannot identify your device, plus the use of privacy. Currently the S110 only support the 4.1 privacy, and there you would have to make sure you distribute IRK during bonding, and then generate a private address every time you start advertising. This way only bonded devices would be able to identify the device as something they are interested in.

BR Pål