Added variable timer for play pos notification, RN_TRACK_CHANGE setter

[martinroger]

Hi @pschatzmann !

The set_avrc_rn_play_pos_callback was hardcoded to output notifications every 10s. Some may want faster playing position notifications (for example, one project I am working one requires notifications closer to 1s) so I introduced a new property to BluetoothA2DPSink call notif_interval_s and an overload of the set_avrc_rn_play_pos_callback method.

Then I got carried away and also added a wrapper for RN_TRACK_CHANGE and an example. I'm not sure if there is anything else than elm_id = 0b0000001 as a possible outcome, but at least it's there, including with an example.

[pschatzmann]

Thanks a lot for your contribution.

I would actually prefer to keep only one version of the set_avrc_rn_play_pos_callback setter method instead of 2. Can you delete the old one and add a default value for the time on your version ?

[martinroger]

Thanks a lot for your contribution.

I would actually prefer to keep only one setter method instead of 2. Can you delete the old one and add a default value for the time on your version ?

Much welcome ! I actually updated the Pull request with another wrapper as you were probably writing your comment, for the TRACK_CHANGE notification.

Will delete the old setter and update the examples.

[martinroger]

Thanks a lot for your contribution.

I would actually prefer to keep only one version of the set_avrc_rn_play_pos_callback setter method instead of 2. Can you delete the old one and add a default value for the time on your version ?

Should be done now ! Let me know.