It depends on what you want to achieve. If you are looking for direct updates, you can check out Bonjour : https://developer.apple.com/bonjour/
You can also use Bonjour to use your phone as a game controller ( https://forums.developer.apple.com/thread/17417 )
I usually use MultipeerConnectivity to communicate between devices, but this is not possible in tvOS .
For a simple exchange of valuable keys, you can simply use Keychain or NSUserDefaults, which is available on tvOS and used between platforms.
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