Hints:
protocol in ObjC/Swift is interface in Java; delegate in ObjC/Swift is listener in Java.
All class names in ObjC/Swift starts with prefix "CM" (i.e CMAccessTokenProvider etc).

MobileSDKError (v4.0)

class MobileSDKError

String getSubcode();

Returns error subcode.

NuboCamWizard (v4.0)

protocol NuboCamWizardDelegate

@optional onConnectingToCameraProgress(float progress);

Will be called periodically to update the progress of connecting to NuboCam.