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Date: Fri, 25 Sep 2009 13:54:41 +0300
From: Johan Hedberg <johan.hedberg@gmail.com>
To: Nick Davies <nickavies@yahoo.com>
Cc: Iain Hibbert <plunky@rya-online.net>,
	linux-bluetooth@vger.kernel.org
Subject: Re: Volume control for headset
Message-ID: <20090925105441.GA19339@jh-x301>
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Hi,

On Fri, Sep 25, 2009, Nick Davies wrote:
>   OK, but I don't know where the RFCOMM socket is created,

audio/headset.c

>   how can I connect to existing socket?

You can't really but you also shouldn't need to. You can request
bluetoothd to change the volume using the SetProperty("SpeakerGain", 0-15)
method on the org.bluez.Headset interface on the D-Bus object that
represents your headset. There's a python script in the bluez source that
lets you do it too, e.g:

test/test-telephony <remote address> speakergain 10
test/test-telephony <remote address> microphonegain 5

Johan