Setting up LIRC for Stretch with Mopidy on Rpi

To find your os use   cat /etc/os-release
Make sure you have mpc installed - sudo apt-get install mpc
Setting up for Stretch is slightly different to the instructions for PiMusicbox.

sudo apt-get update
sudo apt-get install lirc

Add or amend the following lines to /etc/modules
sudo nano /etc/modules
lirc_dev
lirc_rpi gpio_in_pin=18 

Add or amend following in /etc/lirc/hardware.conf
sudo nano /etc/lirc/hardware.conf

# /etc/lirc/hardware.conf
# Arguments which will be used when launching lircd
LIRCD_ARGS="--uinput"
# Don't start lircmd even if there seems to be a good config file
# START_LIRCMD=false
# Don't start irexec, even if a good config file seems to exist.
# START_IREXEC=false
# Try to load appropriate kernel modules
LOAD_MODULES=true
# Run "lircd --driver=help" for a list of supported drivers.
DRIVER="default"
# usually /dev/lirc0 is the correct setting for systems using udev
DEVICE="/dev/lirc0"
MODULES="lirc_rpi"
# Default configuration files for your hardware if any
LIRCD_CONF=""
LIRCMD_CONF=""

Amend or add to /boot/config.txt
sudo nano /boot/config.txt
dtoverlay=lirc-rpi
dtparam=gpio_in_pin=18

Amend or add to /etc/lirc/lirc_options.conf

sudo nano /etc/lirc/lirc_options.conf

driver     = default

device    = /dev/lirc0

Stop and restart lirc to pick up changes

sudo /etc/init.d/lircd stop

sudo /etc/init.d/lircd start

Check lirc is running

sudo /etc/init.d/lircd status

sudo reboot

Testing the IR receiver is relatively straightforward.Run these two commands to stop lircd and start outputting raw data from the IR receiver:
sudo /etc/init.d/lircd stop

mode2 -d /dev/lirc0

Point a remote control at your IR receiver and press some buttons. 
You should see something like this on your screen:

space 16300

pulse 95
space 28794
pulse 80
space 19395
pulse 83
space 402351
pulse 135
space 7085
pulse 85
space 2903 

ctrl & c to exit.

If there is no reaction, check the receiver is connected, that you have battery in remote and run through previous steps again.

Setting up config for remote (Skip if using Keyes Remote)

If you are using your own remote have a look at LIRC  first to see if it's listed there.
If not, it's a simple process to use irrecord to record your own.

sudo /etc/init.d/lircd stop
sudo irrecord -d /dev/lirc0 ~/lircd.conf
Follow the instruction gived by the above command carefully, at the end a ~/lircd.conf file will be generated.
Backup the original lircd.conf
sudo mv/etc/lirc/lircd.conf /etc/lirc/lircd_original.conf
Copy the recorded lircd.conf over 
sudo cp ~/lircd.conf /etc/lirc/lircd.conf
Reboot or restart lirc
sudo reboot or sudo /etc/init.d/lircd start

If using Keyes brand of remote control.

This config file is just for the Keyes brand of remote control

Open the lircd config file, delete any existing info, 

copy & paste details below between the #############

Due to formatting on here you may need to jiggle it around a bit.

sudo nano /etc/lirc.lircd.conf

#########################################################################
# Please make this file available to others
# by sending it to
# this config file was automatically generated
# using lirc-0.9.0-pre1(default) on Sun Jan 19 10:13:19 2014
# contributed by
# brand: KEYES
# model no. of remote control:
# devices being controlled by this remote:
begin remote
name KEYES
bits 16
flags SPACE_ENC|CONST_LENGTH
eps 30
aeps 100
header 9281 4484
one 622 1657
zero 622 513
ptrail 622
repeat 9241 2236
pre_data_bits 16
pre_data 0xFF
gap 109259
toggle_bit_mask 0x0
begin codes
KEY_VOLUMEUP           0x629D
KEY_VOLUMEDOWN   0xA857
KEY_PREVIOUSSONG  0x22DD
KEY_NEXTSONG           0xC23D
KEY_PAUSE                    0x02FD
KEY_1                              0x6897
KEY_2                              0x9867
KEY_3                              0xB04F
KEY_4                              0x30CF
KEY_5                              0x18E7
KEY_6                              0x7A85
KEY_7                              0x10EF
KEY_8                              0x38C7
KEY_9                              0x5AA5
KEY_0                              0x4AB5
KEY_SHUFFLE                     0x42BD
KEY_NUMERIC_POUND    0x52AD
end codes
end remote
#########################################################################

Save and close it.

To ensure changes have been picked up stop and restart lirc
sudo /etc/init.d/lircd stop
sudo /etc/init.d/lircd start
Point controller at receiver, press buttons, each button should now give it's name on screen.
You may need to type irw first before you get a response - if both ways don't give results something else is wrong.

Decide what each button will do.

This is where you decide what each key will do.

To assign what the keys actually run you need a new config file.



You will see all the operations are done using mpc a full list of options is here
sudo nano /root/.lircrc and here  sudo nano /home/pi/.config/lircrc as I can't remember which one it is

 then copy and paste all the text between the lines.

--------------------------------------------------------------------------------------------------------------------- 


begin
        prog = irexec
        button = KEY_PAUSE
        config = mpc toggle
end


begin


        prog = irexec
        button = KEY_NEXTSONG
        config = mpc next
end
begin
        prog = irexec
        button = KEY_PREVIOUSSONG
        config = mpc prev
end
begin
        prog = irexec
        button = KEY_NUMERIC_POUND
        config = shutdown –h now
end
begin
        prog = irexec
        button = KEY_SHUFFLE
        config = mpc shuffle
end
begin
        prog = irexec
        button = KEY_VOLUMEUP
        config = mpc volume +10
end
begin
        prog = irexec
        button = KEY_VOLUMEDOWN
        config = mpc volume -10
end
# insert your playlist name between the " "
begin
        prog = irexec
        button = KEY_1
        config = mpc stop; mpc clear; mpc load "Chef";mpc play;
end

begin
        prog = irexec
        button = KEY_2
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc $
end
begin

        prog = irexec
        button = KEY_3
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_4
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_5
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_6
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_7
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_8
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_9
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
begin
        prog = irexec
        button = KEY_0
        config = mpc stop; mpc clear; mpc load "Your playlist here";mpc play;
end
------------------------------------------------------------------------------

To start on boot use

sudo systemctl enable lirc

to start irexec on boot use make the amendment to /etc/rc.local



sudo nano /etc/rc.local



paste this line near the end, but above the last line

sudo -u pi irexec -d



save it and Sudo Reboot Good luck



Thanks to

https://gist.github.com/prasanthj/c15a5298eb682bde34961c322c95378b

https://raspberrypi.stackexchange.com/questions/6974/how-can-i-determine-which-os-image-i-am-running

https://www.justboom.co/tutorials/configure-justboom-ir-remote-lirc/
http://www.lirc.org/