Re: Volume control for headset

On Thu, 24 Sep 2009, Nick Davies wrote:

   I've tried to control the headset's volume via the volume control on
my platform. I am curious about how the headset's volume is controlled?
Just send some special bluetooth packets to the headset, and then change
some registers related with volume control of the headset?

Yes, it uses a straight serial (over RFCOMM) link with commands/responses
being sent each way in plaintext. eg from Audio Gateway (computer) to
Headset:

+VGS=n

set headset speaker volume (0-15)

+VGM=n

set headset microphone gain (0-15)

      Any explanations are welcome!

You can find more information in the "Headset Profile" specification at
www.bluetooth.com

regards,
iain