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I'd like to start my music player (Clementine) when my bluetooth headset connects to my computer. How do I detect the bluetooth device connecting so I can run a script to start the player?

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2 Answers 2

up vote 5 down vote accepted

I didn't like the polling approach, so I did some digging on bluez and DBus. I ended up writing the following script:

#!/usr/bin/python

import dbus
from dbus.mainloop.glib import DBusGMainLoop
import gobject

import subprocess

# ID of the device we care about
DEV_ID = '00_1D_54_AB_DC_72'

dbus_loop = DBusGMainLoop()
bus = dbus.SystemBus(mainloop=dbus_loop)

# Figure out the path to the headset
man = bus.get_object('org.bluez', '/')
iface = dbus.Interface(man, 'org.bluez.Manager')
adapterPath = iface.DefaultAdapter()

headset = bus.get_object('org.bluez', adapterPath + '/dev_' + DEV_ID)
    # ^^^ I'm not sure if that's kosher. But it works.

def cb(iface=None, mbr=None, path=None):

    if ("org.bluez.Headset" == iface and path.find(DEV_ID) > -1):
        print 'iface: %s' % iface
        print 'mbr: %s' % mbr
        print 'path: %s' % path
        print "\n"
        print "matched"

        if mbr == "Connected":
            subprocess.call(["clementine", "--play"])
            print 'conn'

        elif mbr == "Disconnected":
            subprocess.call(["clementine", "--stop"])
            print 'dconn'

headset.connect_to_signal("Connected", cb, interface_keyword='iface', member_keyword='mbr', path_keyword='path')
headset.connect_to_signal("Disconnected", cb, interface_keyword='iface', member_keyword='mbr', path_keyword='path')

loop = gobject.MainLoop()
loop.run()
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Of course Bluez, and PulseAudio operate through polling DBus. As long as your headset is the default adapter, that will work fine in most cases. Make sure you also connect PulseAudio to the headset if you want to hear something. Thank you for sharing your solution :) –  Takkat May 22 '12 at 6:15

To discover a successfully established Bluetooth connection we can run

sdptool browse xx:xx:xx:xx:xx:xx

By this the SDB connection will be tested for a connection to the given MAC address. It may take considerable time until browsing times out with an error like

Failed to connect to SDP server on 00:0C:78:4F:B6:B5: Host is down

We don't know the exact purpose of your script, but most likely you wish to play audio via Clementine when a headset was connected.

Then we could just see whether there is a Bluetooth audio sink with

pacmd list-sinks | grep xx_xx_xx_xx_xx_xx

Where xx_xx_xx_xx_xx_xx is the MAC address (: needs to be replaced with _). The output will then tell you whether there is a Bluetooth audio sink available or nothing if not.

See this answer on how to switch audio to this sink.


Stream2ip

With stream2ip we can define a shell command or a script to run after a connection was established. There also is an option to automatically start a supported media player after a connection was established:

enter image description here

Stream2ip will also try to reconnect the currently running playback stream to the Bluetooth audio device in case the connection was interrupted.

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Thanks for your answer. You're suggesting that I should poll with sdptool browse <device-id> until I get a 0 return code and then kick off my script, right? Is there a way to do it without polling? –  Erigami May 17 '12 at 20:23
    
Sdptool is slow. I'd go for pulseaudio. You need a loop because we don't know when your device is there. –  Takkat May 17 '12 at 20:38

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