Most likely something on that channel is spamming multicast. That kills most consumer wifi routers (in default settings). Usually something like a sonos or Google home broadcast group.

I might (i.e. I definitely do) have a non-ideal setup at home that contributes to this, with the router/WPA, a RPi running HA with a Zigbee antenna just next to it, my server in the shelf next over and a Sonos above it. Worst of all, the server is running on WiFi and it is sat in immediate vicinity to my router. Why? Because I could not for the life of me make the ethernet transfer speeds be more than somewhere around 1-5 MiB/s, so I gave up. But considering these issues are so infrequent from this location I assume it is mostly due to outside interference.

And adding to that, …

Use an app like PingTools (Android) that can graph what is on each wifi channel. Check to find the cleanest channels in your area and configure your router to use that channel.

… this scan shows that all discovered networks are occupying the same channels (98-114 it looks like). I have still not figured out what OpenWRT option to go for (the OpenWRT One, which I had originally planned, quickly became very expensive with imports and tolls that I ended up not buying, despite having decided to go for it). So I am using the stock ISP router, which I assume everyone else in my building are as well. And I have been unable to locate an option to change channels in its interface.

If you’re curious and technically-minded, I highly recommend this write up: https://www.wiisfi.com/

That is a resource I didn’t know I needed! Thanks :)

Ah, that would make sense. I think my immediate neighbors are home, but about half of my building should be traveling for Easter (judging by the empty parking garage at least).

I use this:

rsync -rah --progress /path/on/source/ user@ip.of.local.server:/path/on/destination

I will try the ping next time I attempt this. There doesn’t seem to be a definite time when the issues start though. It tries to copy the file over, and when it is done it continues to the next. If the first one didn’t succeed, it will retry and if that also fails, it will say “ERROR verification failed - discarding update” (paraphrased) and continue to retry the next file if that also failed.

I do see some fluctuations in the transfer speeds during transfer, which could indicate the times the connection is struggling.

Makes sense that it would be able to, especially considering the flag that allows you to force an older version as the sender. Still find it strange that on equal version numbers they default to different protocol numbers. I would have at least thought there was an easy way to tell it which protocol version to use by default, but I have at least not been able to find out how.

I just joined an old-school phpBB forum dedicated to a specific topic, and it is glorious.

If it wasn’t for the fact that I wanted to share my library with someone else, I would likely stick with my system for quite some time still. But I need it to be browseable for them.

Hm, I never considered Audiobookshelf for e-books - I already have it running for audiobooks. I should check that out!

Good to know - I will keep my eyes peeled!

Grimmory looks sweet, but with the recent drama and the apparent opt-out (but not really) telemetry, the massive amount of AI-generated code etc. I will want to let the age a little before I install that on my server.

ETA: Well, I toured the Calibre-Web settings again, and now I can upload books and covers. Must have been a little tired on my first attempt. Still couldn’t get the conversion to work properly - I only have the option of going from EPUB -> KEPUB (whatever that is). I typically prefer reading PDF on my current reader, and I have users who need .azw3 for their jailbroken Kindle device. I guess the paths to the conversion tools aren’t properly configured.

ETA2: Now I got the conversion to work as well. Seems like I will be able to use it with Calibre-Web only as well. Nice!

Hm, I’m using lscr.io/linuxserver/calibre-web:latest, which is version 0.6.26 (5a1f3d8eec42d03228b1e5dec9bc750ca10bbc94 - 2026-02-06T20:40:07+01:00). Looked again to see if I could find a way to do it, but no.

How do you upload books directly using Calibre-Web? And do you not have Calibre running behind at all, just the original database?

An other shortcoming of Calibre-Web seems to be that I am unable to convert books from the UI (that is thankfully very easy to do in Calibre). I added some Docker mods that I thought would allow me to do this, but I have at least not found a way.

Nice to know it works with Kobo - I don’t have one, but if my current reader stops working I am likely to get one of those.