calibre
The calibre plugin supports sending documents from your calibre library using a wireless connection. It also supports searching across the calibre metadata available on the device.
TODO
To use this plugin you need to keep your PC that runs Calibre and your KOReader device in one local network usually in one router. Then start your Calibre wireless device connection as the following screenshot shows:
Use the default option in the popup window should be OK as for Calibre version 4.19.
After the calibre wireless device connection is established (the red indicator of the connection button changes into green), go to the plugin tab of KOReader and select "Connect" option in the "Calibre" plugin. If all things go right Koreader should say "Connected to Calibre Server at somehost:someport" and your Calibre should recognize KOReader as a wireless device like this:
You can send one or more documents to your KOreader device from your Calibre Library now:
Note that if it's the first time you run Calibre plugin, you may be prompted to choose the "Inbox" directory in which the received documents will be saved.
If your device doesn't show up but you can connect to Calibre on your ereader, your wifi is probably disabled after being inactive.
If you're trying to copy many files wirelessly onto your device and the process seems to be taking a long time, try navigating one directory "up" in KOReader (if you're viewing the directory into which the files are being imported). Sync will continue, but will now be significantly faster since KOReader will no longer be trying to update your list of files with every new book that's received.
This is particularly noticeable on Android.
The usual way of changing filename templates doesn't work with the SmartDevice driver used for calibre wireless connection. Instead you need to customize the SmartDevice App Interface plugin directly by following these instructions.
Select "Preferences" in the Calibre toolbar, then select "Plugins" under the advanced row.
Then search for "SmartDevice", selecting SmartDevice App Interface.
Select Customize Plugin, here you can change your filename template and click ok to save your template.
To understand how calibre's template language works see the instructions in the calibre manual: https://manual.calibre-ebook.com/template_lang.html
None, by default. See https://github.com/koreader/koreader/issues/12062#issuecomment-2190044070