I suspect quite a few idevice owners are having problems when trying to get IOSRA/Marvin plugins working because of a known problem in the libimobiledevice library.
Please see here for an instance of the problem:
https://www.mobileread.com/forums/sho...d.php?t=255105.
I actually use a private build of libimobiledevice in which I have added a small workaround so that wifi detected idevices are ignored. I raised this issue (with my suggested workaround/fix) some time ago on GitHub:
https://github.com/libimobiledevice/...muxd/issues/22, where it is acknowledged that there is a problem, but the issue is still open.
One option would be to just add my existing fix to the Calibre libimobiledevice source, so at least plugin users will get the benefit of it, whilst we await an official fix.