How would I integrate my Nvidia Shield into HA so that I can use it to trigger some lights when it is turned on?
Thanks.
I don’t have any experience with the Shield as trigger. I use Kodi (on a shield) as trigger for my lights in combination with node red when we watch a tv serie or a movie.
This is my node red. I’m not much a node red wizard but I’m pleased with how it’s working. There is always room for improvement 
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The easiest way is send restful web request to HA on startup (it’s specially formatted URL / web address).
You’ll need to look around for an app that can do that, but I know they exist for Androids.