title: EAAccessory to accept all protocol string
body: <p>In the documentation of EAAccessoryManager it says we need to add "Supported external accessory protocols" in the settings plist. But this can be done for known protocol strings. What if I don't know the protocol string or string which are not in the list, if my application has to detect any arbitrary device which are "made for iPod" how do I do that?</p>
  
  <p>And also how do I know the Protocol String of the Device?  Where to find this?</p>