Inspired by this thread, I splashed out on a Raspberry Pi 4B (2GB), with
a USB-C power supply, a micro-HDMI to HDMI adapter cable to connect to a
monitor, and a case. The details are below. The bottom line is that it
works but cannot go to sleep, so you're putting a couple of Watts of
heating on permanently. I'm keeping it as a backup but seriously
considered sending it all back.

While I was going through the process, on the side I also:
- downloaded
https://downloads.slimdevices.com/nightly/8.2/lms/5e684bb92e36afc2b221cebfe316c4094bf3cc69/logitechmediaserver_8.2.0~1621831622_arm.deb
[yes, it's a beta version, you could use the 8.1]
- logged into my ReadyNAS 212 running OS6
- clicked Apps -> Upload
- pointed it to the saved .deb file and clicked Upload
- waited for it to do it's thing, then rebooted the NAS
- found my LMS upgraded from 7.9.2 to 8.2.0 with all plugins, favourites
etc still in place. Done.
So this is what I'm going to keep using, so long as _arm.deb packages,
the Spotty Helper app etc (thank you Michel Herger!) are available.
It doesn't show up in the ReadyNAS web interface but that doesn't stop
it from working - note this was an upgrade, there's a bit more on this
below.

Also a blow-by-blow account for anyone as new to Raspberry Pi as I
was/still am...

Good luck, all!

Note on Poussin etc: 
I was previously using the ReadyNAS version of LMS 7.9.0 by NAStools,
which appeared on the UI's Apps list. I then uploaded 7.9.2 as a .deb as
above and used that instead, which seemed to inherit favourites etc
(this was a while ago, actually I may have still been synching with
mysqueezebox.com). I later turned off 7.9.0 using the interface. 
The Poussin App noted above in the thread wasn't required for me. As
part of the current upgrade I tried it, it did load and show up in the
interface but deactivating it with the On/Off button had no effect on my
LMS 8.2.

OOBE for LMS-on-piCoreplayer-on-RaspberryPi:
        0. Lots of kudos to the picoreplayer (pCP) team for documentation
        0. Connect LAN, keyboard, mouse, monitor to Rpi and power on - it
boots. Phew, that Raspberry Pi (Rpi) is tiny but it works!
        0. TL: DR typical faffing about, greatly facilitated by pCP browser
interface.

        1. Start with https://docs.picoreplayer.org/getting-started/
        Most steps have detail in https://docs.picoreplayer.org/how-to/
        
        2. Download DiskImage programme to PC from sourceforge.
        3. Install DiskImage
        4. Download pCP image file and unzip on PC
        5. Expand image to a microSD card (mine was 8GB) using DiskImage
        
        6. Find microSD card slot in RPi4B using a photo online, as there are
no user docs included.
        7. Load the microSD, power on, RPi4B boots: colours on screen, looks
good, and helpfully displays its IP address.
        8. Connect PC web browser to IP address, get a pCP graphical browser
interface.
        
        9. Read more How-To's [this was a mistake]
        Download PuTTY
        Uninstall old PuTTY
        Install new PuTTY
        Read up on how to use PuTTY again
        Can't get a connection - typo in IP address.
        Correct the IP address and connect.
        Login tc
        Pwd piCore 
        Connection now works but [after more faffing about] I didn't need it. 
        
        10. Back to pCP Getting Started guide and the pCP browser interface,
find the steps to install LMS.
        11. Expand file system button, provide 2GB [where, to what?] ….
OK
        12. Install LMS button …. OK
        13. Need to mount NAS drive to access music library … nothing
doing, greyed out. 
        14. Needs Additional File Systems, a button above … OK.
        15. Right, Network Disk Mount is now accepting settings. Enter a name
for the drive, IP of NAS, get music share name from ReadyNAS interface,
… er … I shouldn't need NFS as per instructions (pCP to
connect to a Synology NAS), it should work with CIFS? No joy. Yes joy,
if you use the correct password for your NAS.
        16. It's asking for a Reboot. OK, button to reboot the Rpi, wait for
the browser interface to return (it's quick).
        17. Following LMS setup suggestions … Tweaks - don't autostart
SqueezeLite (as my Rpi is a server not a player) at http://[your Rpi
IP]/cgi-bin/tweaks.cgi 
        18. Reboot Rpi again, via button as requested.
        19. Point PC's browser at [your Rpi IP]:9000 - get the familiar LMS
interface, and it's LMS 8.1.1. A bit of setup, it automatically scans
the music library, all fine. Well, failed to precache the artwork.
        20. Start choosing plugins. Server responds really fast.
        21. Restart LMS - we have a functioning system but it needs Favourites,
and to set up several plugins with account details etc
        22. Rescan the music library, this time it does get the artwork. [By
now, the original ReadyNAS installation has long since been updated,
with all the original plugin settings that pCP LMS still lacks.]
        23. http://[your Rpi IP]/cgi-bin/lms.cgi is the main page for LMS.
Looks like there's an update button, nice potentially for the future.
HOWEVER, a bit of searching reveals that there is no accessible
sleep/low-power mode on Rpi, it's on all the time. 
        24. Use the pCP Stop LMS button to stop the server. 
        25. Type "sudo poweroff" on the Rpi keyboard to shut down the Rpi, as
it has no hardware on/off function until you build/buy one. Disconnect
power.


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