So I've had Connect via Network working twice before now my Apple TV. And twice it's decided to just stop working. The first time this happened I completely unpaired everything (1) in Remotes and Devices and (2) in Xcode's Devices by unpaing and deleting the device. Eventually I got it paired again. Took more work than expected.
Round 2. Went through the same steps, but this time with lots of restarting of the Apple TV. Finally got a successful pairing. I see the little wireframe globe next to the Apple TV's name in Xcode.
But now I get one of two error messages when building from Xcode (trying both 9 and 9.1 Beta)...
Could not receive a message from the device.
or
An error was encountered while attempting to communicate with this device. (End of file.) Please try rebooting and reconnecting the device. (0xE800000E).
Building succeeds. Says Running, but the promise of not getting up off the couch to test is slipping away.
Anyone have some ideas here?