Bash script to automatically switch PulseAudio sink to Bluetooth headset on connect with A2DP profile and 50% volume.

gistfile1.sh

#!/bin/bash

sink_name="bluez_sink.00_42_1B_AD_FA_CE"

if [ -z "$1" ]; then
	dbus-monitor --system "path=/org/bluez/777/hci0/dev_00_42_1B_AD_FA_CE, interface=org.bluez.AudioSink, member=Connected" | while read line; do
		echo $line
		$0 1
	done
else
	if pacmd list-sinks | grep -qi $sink_name; then
		if pactl stat | grep -qi $sink_name; then
			echo "Already done."
		else
			echo "Setting profile..."
			pactl set-card-profile bluez_card.00_42_1B_AD_FA_CE a2dp
			echo "Setting sink..."
			echo "set-default-sink $sink_name" | pacmd > /dev/null
			echo "Setting volume..."
			pactl -- set-sink-volume $sink_name 0
			pactl -- set-sink-volume $sink_name +50%
		fi
	else
		echo "Not connected."
	fi
fi

Here's an alternative I wrote, which switches between the Bluetooth headset and my notebook's speakers.

#!/bin/bash
sink_addr=“F0_13_C3_27_0B_40”
mac_addr=“F0:13:C3:27:0B:40”
alsa_card="alsa_card.pci-0000_00_1b.0"
if bluetoothctl <<< “info $mac_addr” | grep -qi “Connected: no”; then
      bluetoothctl <<< “connect $mac_addr”
      pactl set-card-profile $alsa_card off
      sleep 6s
      pactl set-card-profile bluez_card.$sink_addr a2dp
      pactl set-sink-volume bluez_sink.$sink_addr 50%
else
      bluetoothctl <<< “disconnect $mac_addr”
      pactl set-card-profile $alsa_card output:analog-stereo+input:analog-stereo
fi