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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Date:   Thu, 4 Feb 2021 08:52:19 -0800
Message-ID: <CABBYNZJh8y8NJ2b=wOo33Zp1pqD52uA47ORw_bO2F97QOcccYA@mail.gmail.com>
Subject: Re: How to disable cache?
To:     Kenny Bian <kennybian@gmail.com>
Cc:     "linux-bluetooth@vger.kernel.org" <linux-bluetooth@vger.kernel.org>
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Hi Kenny,

On Wed, Feb 3, 2021 at 9:20 PM Kenny Bian <kennybian@gmail.com> wrote:
>
> Hello,
>
> In "/etc/bluetooth/main.conf", there seems a way to disable the cache:
> [GATT]
> Cache = no
>
> What does exactly the "disable cache" mean? It means the
> "/var/lib/bluetooth/[MAC_ADDRESS]/cache" folder won't be created?

That means it won't cache any GATT attribute found when discovering,
the cache folder has other information as well.

> We tried to disable the cache by changing the
> "/etc/bluetooth/main.conf". It seems the
> "/var/lib/bluetooth/[MAC_ADDRESS]/cache" folder is still created even
> if it was deleted.
> However, we noticed that the "[Attributes]" section in
> "/var/lib/bluetooth/[MAC_ADDRESS]/cache/[iPHONE_MAC]" file is gone.
> Does it mean the "disable cache" is working? Does it mean the handles
> used between the bluetooth and the mobile app won't be cached?

Yes, that is the result of not caching anything.

-- 
Luiz Augusto von Dentz