Detecting when an Apple TV 4th generation has woken from sleep

I'm working on some home automation programs and one of the things I want to be able to do is detect when my 4th generation Apple TV has woken from sleep. This will generally only ever happen when someone pressed a button on its Siri remote to wake it up.

I have a PC (connected to the same TV as the Apple TV) that has a Pulse-Eight USB-CEC adapter, so naturally the first thing I tried was using CEC to determine when the Apple TV is awake. Unfortunately it's not reliable, since monitoring the Apple TV's power status to see when it wakes up produces false positives. (I should note that I do not have "Control TVs and Receivers" enabled on the Apple TV, and can't turn it on for the particular project I'm working on because I need the Apple TV to not change the TV's input.)

I'm trying to think of some other way to do this. I'm open to any possibilities, including things like:

• Making use of private APIs on the Apple TV
• Running an 'always on' program in the background of the Apple TV that sends a signal when the Apple TV wakes up, if that's even possible. (I suspect that it isn't.)
• Monitoring the bluetooth communication between the Siri Remote and the Apple TV, if that's possible
• Somehow filtering HDMI-CEC commands so that I can turn on 'Control TVs and Receivers', allow the Apple TV's CEC commands for turning on and off the TV, and exclude commands for changing the TV's input.
• Any other method, no matter how hacky or ridiculous, as long as it works!

Does anyone have any suggestions? I'm running out of things to try!

Here I am, six and a half years later, and I've finally found a better way to get the power state of my Apple TV.

I can simply use pyatv, which has a function named power_state that returns the Apple TV's current power state.