Re: Caching device name in different connectable state

Thank your Marcel for the clarification.

As Luiz mentioned previously though, as random static addresses can be used
by other devices, it may makes sense to avoid caching their name. Would you
agree?

On Thu, Jun 23, 2016 at 3:29 PM Marcel Holtmann [off-list ref] wrote:

Hi Francois,

quoted

I have a bluetooth beacon device that advertises a name depending on
its configuration (connectable or not).
Sadly, in Bluez, the first time it sees it while advertising its name,
it caches it which is nice for future discovery.
Except it doesn't because I don't want to see this name while it
advertises in non-connectable state as it is "not" the same device
anymore (sort of).
I guess what I'm asking is if we can make Device name aware of the
connectable state and only use it if it matches state when it was
cached.

yikes, this is super tricky. If the device uses the same address, then it
is the same device. If it is not the same device, then it should use two
different addresses (sort of a dual personality).

Please keep in mind that a lot of device identity is based around either
the public address or the static random address. We even clarified that as
identity address in the latest specification. The mode has nothing to do
with it. It makes it even more complicated since a device can be in
broadcaster and peripheral role at the same time. It is just a matter of
instantiating a second link layer state machine. However even in that case
my advise is two use two different addresses if they are independent.

Regards

Marcel