I am developing an external hardware that needs to make USB interface to iPhone. (30pins for now).
I do not think Apple would approve MFi for an individual.
For USB interface, is there no way? Or any kind of breakout board and protocol available?
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I believe there are two ways to sneak around the Apple MFi approval
It seems that Apple, in order to provide maximum robustness for the users of their OSes ( and possibly other, more nefarious, closed-door reasons ) has decided to make everyone jump through hoops to get any integration with anything working. good for their customer in terms of public perception of stability of their OS, but bad for their developer ecology. but it's their strategy, and developers must deal.
My answer is not really answering your question directly, but I hope to prevent you from going on a further wild goose chase, when powerful forces are working to prevent what you are trying to accomplish.
for goodness sakes, the IPad doesn't even have a USB port. i asked the salesperson in the store about it, and he said USB drives were 'archaic' and 'the iCloud is better'. the point is , if this is the company line vis a vis compatibility, good luck.
Apple does have capability of accessing USB devices, but said USB interface is extremely limited, only works with some devices, and is restricted to viewing only 'image' type file on external file systems. Prognosis: not looking good for getting it working with 'external hardware'.