Although, the Alexa App sees and recognizes Roku TV's the routines to define commands to the Roku TV are limited to:
Power On/Off Roku TV
Set Volume to XX on Roku TV
Open (an App) on Roku TV (i.e YouTube, Prime Video, etc)
The Amazon Cube takes this further to allow the routines to define commands to the Apps on the TV, such as the following four services:
Play Easy Jazz on Amazon Music
Open "Good Mornin'" on YouTube
Tune channel ABC on YouTube TV
Play movie Sound Of Music on Amazon Prime
Thus I can sit at home, using a tablet with Mom's Alexa app to program her TV daily to all sorts of movies. videos, music and TV programs.
Also, because the Amazon Cube includes video calling when an external camera is added, Vidwo Calling can be programmed into her day as well.
The Problem:
Using an Amazon Cube for Video Calling the Cube end defaults to Video Off!
In the case of a caller dropping in on mom or using routines to schedule mom's cube to initate a call to a son, daughter, sister, etc... Mom's end (The Cube) defaults to video off, requiring her to tell the cube "Alexa, Video On".
At 90, mom is still pretty lucid but not enough to remember to do that. So I have added a second "Echo Dot" to her room. I have given each device a unique "Wake Word" in lieu of "Alexa".
Dropping In on Mom, once connected the caller simply says "Ziggy, I Love Shirley".
The Ziggy word wakes up the Echo Dot and the routine in the Dot is triggered by the "I Love Shirley" phrase. The triggered routine is an Announcement which says "Computer, Video On"
Voila, It Works!
In the case of scheduled routines to call others, I simply include an announcement in the rotuine about 20 seconds after the Call "so & so" command.
If the recipient does not pick up the call soon enough, or...
If the or if one or both parties begin talking and over-talk the computer announcement..
...they can always say the magic phrase... "Ziggy, I Love Shirley"