nut VS shairport-sync

> what software do you recommend for gnu/linux to take input from the UPS to tell the laptop to shutdown?

https://networkupstools.org/

The Synology software is based on N.U.T. https://networkupstools.org and the Plus 1100 (listed on NUT as the Easy Power 1200) is supported in the native package with the 'blazer' driver. If you have the skills, I would SSH into the NAS and see if the device is 'noticed' or better yet recognised by the USB sub-system when you plug it it. (Normal Linux would use the lsusb command to see devices but I have no NAS handy to see if this is valid on the Synology)

Others have answered the hardware part of your question. I have not seen much mention about the software to control graceful shutdowns. For this I suggest you look at the ”Network UPS Tool” (NUT for short) project (https://networkupstools.org/). It is mostly manufacturer agnostic with clients for a vast array of hardware components.

You're looking for NUT.

Network UPS Tools is one option: https://networkupstools.org/

APC is giving me pre-nut clarity.

So no, the NAS does not monitor the battery level. The UPS does that. The NAS just acts on the messages it receives from the UPS via Synology's version of NUT - Network UPS Tools (https://networkupstools.org/). The NAS will first receive the ON_BATTERY/POWERFAIL signal. Then, eventually the BATTERY_LOW signal at which time the UPS will shutdown. So you really need to set a time for it to shut down *BEFORE* you get BATTERY_LOW.

It's worth noting that shairport-sync exists. Perhaps it could be made easy by knitting some functions together?

You want SnapCast. You'd run snapserver on your Linux box and snapclient on your Pi's. Snapserver has support for Airplay (via shairport-sync) and Spotify (via librespot). I recommend using MPD for your music library, as I don't think PlexAmp can output audio in a way that's useful for snapserver.

I use shairport-sync for airplay (https://github.com/mikebrady/shairport-sync), complete instructions via: https://blog.adena.dev/blog/apple-airplay-on-raspberry-pi-in-7-easy-steps

If you’re interested, you might be able to get Airplay 1 & 2 support by running shairport-sync on your pi.

The plan is to run shairport-sync on the Omega 2 and have audio output to a 2x50w class d amplifier board.

To replace it, I've purchased in-ceiling speakers and a Control 4 Amp (C4-16AMP3-B) which I can control via the network. I plan on using shareport-sync for AirPlay and librespot for spotify as the sources to play music. 90% of the use for my whole home audio is for music.

ShairPort-Sync allows my Mac to listen for a AirPlay with multiple instances available, each pointing to different settings as per this GitHub Issue, which would allow me in theory to run multiple AirPort plugs and output each to an Alexa. Rarely would I ever need to have them playing all at once, and at this point I don't really care about maintaining pure audio quality or latency. I just need to be able to get out of my office and move to the kitchen, then back to my office without needing to spend a ridiculous amount of time trying to move what I was listening to on my iPad into my Echo Show

The benefit of the Pi is the open source software, in particular I use https://github.com/mikebrady/shairport-sync in order to turn it into an AirPlay 2 receiver, which I can stream to using my phone or laptop. It's my main way of sending audio to my hifi setup.

The only option I know of would be to use multiple raspberry pi’s running Shairport-Sync. I’ve been using the airplay 2 version for about a year and it works great. You might be able to build a server and run multiple instances of shairport with multiple audio cards. https://github.com/mikebrady/shairport-sync

So, after looking around, I realised that just like the Nest Hub 2nd gen, the Nest Audio also has a (sort of) exposed debug USB port. And these devices are (originally) running Linux. Since the Nest Hub 2nd gen has been jailbroken, I'm hoping that I can do the same on the Nest Audio, with a singular purpose: to inject a ShairPlay service, which would run parallel to the Chromecast services, which would allow me to use them as native AirPlay2 speakers.