I have a Kindle Paperwhite. I also have Calibre, and a goodly number of DRM free ebooks that have nothing to do with Amazon. I'd like to be able to transfer these to the Kindle without the hassle of a USB cable.
I.e. what I'm looking for is to change some setting on the Kindle to make it talk to my Calibre server instead of to Amazon - so that I can disable airplane mode, turn on the wifi and tell Calibre to "send that book to Kindle", and have it appear on the device once it's downloaded.
I don't care about missing out on software updates from Amazon.
Is it possible to do this? If so, how?