Hi,
I found synback's android app which in theory can initialize a sync via wifi not worth while, but to be honest, I didn't try in earnest because the USB works fine with me.
Syncback is one of the most detailed customizable synchronisation/backup software I have met.
In the Expert modification dialogue (see here:
)
there is the possibility to synchronize with a MTP connection and to automatically synchronize when connected (as shown above).
It works absolutely hasslefree for me. In fact, it's my prefered way of transfering documents and other stuff to the MAX2. I have some of the folders mirrored on my computer, and copy/delete files from those folders, then connect the MAX2, and just a little later, the MAX2 is synchronized - files transfered to/deleted from the Max2.
Best,
Jan