Calibre OPDS (and HTML) PHP Server : web-based light alternative to Calibre content server / Calibre2OPDS to serve ebooks (epub, mobi, pdf, ...)
Does your NAS have an accessible server (apache or nginx ...)? Take a look at COPS (Calibre OPDS Server) . I'm running it under apache on a raspberry pi quite successfully. I'm using TiReader on an iPad to access the COPS library via wifi, but there are several Android readers that can access and download from OPDS libraries.
OPDS Server + Synology DSM 7.0 + Calibre 5.34
1 project | reddit.com/r/synology | 24 Dec 2021
OPDS server on raspberry pi
1 project | reddit.com/r/Calibre | 18 Oct 2021
What the heck have I gotten myself into?
1 project | reddit.com/r/synology | 23 Jun 2021
Any interesting / cool plugins? my OPNSense is so stable that it's a bit boring now...
1 project | reddit.com/r/OPNsenseFirewall | 9 Apr 2021
Slowness on a Pi Zero W
1 project | reddit.com/r/pihole | 19 Jan 2021