Raspberry pi bluetooth speaker

bluetooth-adapter.sh

hciconfig
hciconfig hci0 up
hciconfig hci0 reset

# Scan for Bluetooth devices
hcitool scan

bluetooth-speaker.sh

sudo apt-get update
# RPI non-Zero
sudo apt-get install -y bluez pulseaudio pulseaudio-module-bluetooth
# RPI Zero
sudo apt-get install bluealsa mpg123
sudo service bluealsa start

sudo bluetoothctl

# in console [bluetooth]# 
agent on
default-agent
scan on
# wait for your device to show and make it discoverable
trust YOURMACADR
pair YOURMACADR
connect YOURMACADR
quit

# RPI non-Zero
pulseaudio -k
pulseaudio -D
# look for bluez card
pacmd list-cards
# look for bluez card
pacmd set-default-sink bluez_sink.xx_xx_xx_xx_xx_xx
pacmd set-card-profile bluez_sink.xx_xx_xx_xx_xx_xx a2dp_sink

# RPI Zero
# aplay -D bluealsa:HCI=hci0,DEV=XX:XX:XX:XX:XX:XX,PROFILE=a2dp /usr/share/sounds/alsa/*
cat  <<EOF > ~/.asoundrc
defaults.bluealsa.interface "hci0"
defaults.bluealsa.device "XX:XX:XX:XX:XX:XX"
defaults.bluealsa.profile "a2dp"
defaults.bluealsa.delay 10000 
EOF

aplay -D bluealsa /usr/share/sounds/alsa/*
# mpg123 -a bluealsa test.mp3

go-bluetooth-speaker.sh

#!/bin/bash

MAC_ADDRESS=78:44:05:96:3D:EE
MAC_ADDRESS_=`echo $MAC_ADDRESS | tr ':' '_'`
# a2dp_sink, headset_head_unit, off
PROFIL=a2dp_sink

bluetoothctl <<-EOF
agent on
default-agent

trust $MAC_ADDRESS
pair $MAC_ADDRESS
connect $MAC_ADDRESS
EOF

sleep 2

pacmd list-cards

pacmd set-card-profile bluez_card.$MAC_ADDRESS_ $PROFIL

pacmd set-default-sink bluez_sink.$MAC_ADDRESS_.$PROFIL
pacmd set-default-source bluez_source.$MAC_ADDRESS_.$PROFIL

Pulseaudio comes with one modulo to switch automagically to last device connected.

Try to gives this command to pulseaudio (or enable it in pulse.conf)

pactl load-module module-switch-on-connect.

I think KODI must be set to Alsa device output (or pulse)