I have a Xiaomi 4S TV, and once it is off, there is no way to turn it on unless using the remote control (which is a Bluetooth remote).
I've been able to pair the phone's bluetooth with the TV. I've tried using the "Android TV remote control" ( https://play.google.com/store/apps/details?id=com.google.android.tv.remote&hl=es&gl=US ) but it is unable to turn on the TV, just control once it is turned on. But I can't find a way to send the "Turn On" command through Bluetooth. Or even with the Raspberry PI as the bluetooth remote.
Any idea of how to do it?
Use google assistant "Turn on 'your TV name' " and the same thing to turn it off "Turn off 'your TV name' "