Re: example GATT code to talk with a sensortag

[Don Zickus <dzickus@redhat.com>]

On Mon, Jan 11, 2016 at 03:43:40PM -0300, Luiz Augusto von Dentz wrote:
> Hi Don,
> 
> 
> You will need to pass -E to bluetoothd to enable the experimental
> intefaces, btw there is a recent change to GATT server/peripheral so I
> suggest you try with the current version on git.

Hi Luiz,

I passed the -E and compiled and installed the latest git version of bluez

commit e81aeaea21db84042ee0c30159290ca56d250111
Author: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Date:   Wed Jan 6 12:20:45 2016 -0300

I installed d-feet to help me with the d-bus interfaces as I was struggling
with that.  With the -E option I now see 'GattManager1' pop up under
'/org/bluez/hci0'.

I guess I was expecting to see a 'GattService1' and 'GattCharacteristic1',
but I don't.

I tried poking the 'GetAll' interfaces under my device
'/org/bluez/hci0/dev_XXXXXX' using 'org.bluez.Device1' as my interface.
That got me some device info but my UUIDs were empty [].  I tried using the
'Connect' Method in the same interface but that didn't seem to change
anything.

I am scratching my head trying to understand how this works.  Looking
through the documentation in the bluez tree it appears I need a gatt-server
that provides 'GattServices1'?  Did I read that wrong?

Again, my goal was to simply read temperature data out of my sensor.  I know
the UUID and the handle (from my successful use of the gatttool), I just
don't know how to connect to the DBus correctly??? to get the same info.

Perhaps I falsely assumed that if gatttool can get it, then there was an
interface that I can use to get the same info.

I apologize for all the newbie questions.  And thank you for your patience
and help so far.

Cheers,
Don