The rejection I got from Apple:
We have discovered one or more issues with your recent delivery for "YourApp". To process your delivery, the following issues must be corrected:
Invalid Bundle Structure - The binary file 'YourApp.app/ZEBRA/libZSDK_API.a' is not permitted. Your app can’t contain standalone executables or libraries, other than the CFBundleExecutable of supported bundles. Refer to the Bundle Programming Guide for information on the iOS app bundle structure.
Once these issues have been corrected, you can then redeliver the corrected binary.
The App Store team
Support for iOS 10 hasn't been confirmed for Link-OS SDK. iOS versions up to 9 are currently supported. However, in general, you should be able to establish TCP/IP connections using the Link-OS SDK with the GK420d.