Re: Device class not writeable via dbus

[Marcus Redeker <marcus@openremote.org>]

> On 16.04.2015, at 11:36, Luiz Augusto von Dentz <luiz.dentz@gmail.com> wrote:
> 
> Hi Marcus,
> 
> On Thu, Apr 16, 2015 at 11:53 AM, Marcus Redeker <marcus@openremote.org> wrote:
>> 
>>> On 16.04.2015, at 10:15, Luiz Augusto von Dentz <luiz.dentz@gmail.com> wrote:
>>> 
>>> Hi Szymon, Marcus,
>>> 
>>> On Thu, Apr 16, 2015 at 11:01 AM, Szymon Janc <szymon.janc@tieto.com> wrote:
>>>> Hi Marcus,
>>>> 
>>>> On Thursday 16 of April 2015 09:09:28 Marcus Redeker wrote:
>>>>> True, but  I would like todo that through dbus and not manually and have to restart bluetoothd afterwards.
>>>>> Any chance this can be done in the near future?
>>>>> -Marcus
>>>>> 
>>>> 
>>>> Class of Device is rather static configuration as those describe form factor
>>>> and that usually doesn't change.
>>>> 
>>>> Why do you need to change CoD on the fly?
>>> 
>>> It is possible to change at runtime by using systemd hostname plugin
>>> then change the org.freedesktop.hostname1.Chassis property, but Im not
>>> sure how easy is to change that. Anyway the point is that this should
>>> not changed by applications at will as it could break discovery
>>> filtering, even thought filtering by class is probably broken by
>>> design.
>>> 
>>> --
>>> Luiz Augusto von Dentz
>> 
>> This would allow to change the name of the bluetooth adapter but not the device class.
>> The name can already be changed using the read/write alias property which is no problem.
> 
> Looks like you know more than us how BlueZ works, perhaps you want to
> tell me what is this code for:
> 
> http://fpaste.org/211586/76181142/
> 
> Btw, BLE don't really have a class it has appearance which is not
> quite the same, we may actually have a different property for
> appearance along with a main.conf entry to set it and also a
> conversion from chassis to appearance.
> 
> 
> 
> -- 
> Luiz Augusto von Dentz

Sorry, if I stated something wrong. I did not check the BlueZ code.
I don’t know BlueZ at all and I am just trying to look at it from a user prospective who is trying to use dbus and BlueZ to create an application.

Looking at the complete file hostname.c, I can see that changing the Chassis property would indeed change the device class but only to predefinded values desktop, server, laptop, handset and tablet.
I will not be able to use it to change to HID device class 0x000540

-Marcus