The old Calibre (.9x) was much simpler to troubleshoot (less user info needed

)--- It had only a few features back then
Content server (network: wired or WiFi) = Pull from Host, can use any browser
Wireless Device (Do they even make an Android device with a Wired connection?) = (mostly) HOST Push, looks like any USB connected to Calibre Device.
The mostly, is there because of the Sync feature that
updates what is on the device without you being at the host.