Bluetooth speaker connection script. Out of convenience written in Ruby.

nojz

#!/usr/bin/env ruby
require 'open3'

class NojzError < StandardError

  def initialize(msg)
    @msg = msg
    super(msg)
  end

  def custom_message
    if @msg.include? "org.bluez.Error.NoSuchAdapter: No such adapter"
      "PLEASE TURN BLUETOOTH ON"
    elsif @msg.include? "org.bluez.Error.Failed: Connect Failed"
      "UNABLE TO CONNECT TO CREATIVE D80 SPEAKERS"
    else
      @msg
    end
  end

end

class Nojz
  BLUETOOTH_MAC_ADDRESS = "00:02:02:33:B1:87"
  SINK_NAME = "bluez_sink.00_02_02_33_B1_87" 
  SOURCE_NAME = "bluez_sink.00_02_02_33_B1_87.monitor"
  class << self  

    def connect_to_speakers
      begin
        Open3.popen3("bt-audio -c #{BLUETOOTH_MAC_ADDRESS}") do |stdin, stdout, stderr, wait_thr|
          errors = stderr.read
          raise NojzError.new(errors) unless errors.empty?
          adjust_sound_settings
        end
      rescue NojzError => e
        alert e.custom_message
      end
    end

    private

      def adjust_sound_settings
          set_bluetooth_sink_to_default_sink
          set_default_source    
          set_sink_volume  
          transfer_sink_inputs_to_bluetooth_sink
      end

      def set_bluetooth_sink_to_default_sink
        `pacmd set-default-sink #{SINK_NAME}`
      end

      def set_default_source
        `pacmd set-default-source #{SOURCE_NAME}`
      end

      def set_sink_volume
        `pacmd set-sink-volume #{SINK_NAME} 0x6000`
      end

      def transfer_sink_inputs_to_bluetooth_sink
          sink_input_indices.each {|sink_input_index| `pacmd move-sink-input #{sink_input_index} #{SINK_NAME}` }
      end

      def alert(msg)
        puts "\033[31m#{msg}\033[0m"
      end

      def sink_input_indices
        sink_inputs = `pacmd list-sink-inputs`
        sink_inputs.split("\n").map {|line| line.split(' ').last if line.include? "index"}.compact
      end 

      def turn_bluetooth_on
        `rfkill unblock bluetooth`
      end

  end
end

if ARGV.length == 0 || ARGV[0] == "on"
  Nojz.connect_to_speakers
end

Make the script executable:

chmod +x nojz

Add to ~/.bashrc:

export PATH=/home/damir/Desktop/rails_projects/nojz/:$PATH

To be sure sink inputs will be redirected to the new sink, add to the /etc/pulse/default.pa file:

load-module module-stream-restore restore_device=false