I'm typing while walking so have to be brief: I'm confused about that debug log because it shows the connection working properly. Calibre connected to CC on "[your name]'s iPad mini 4". It then went through the expected startup synchronisation. I can only assume it worked this time, but not before. Did you change something or is your network just being intermittent? Remember, once you're connected as a wireless device, you send books by clicking buttons in Calibre on your computer.
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