Yesterday I found an update on amazons developer blog: https://developer.amazon.com/public/community/post/Tx1WVAG8L2OOXF0/Alexa-Voice-Service-Introduces-API-Update-that-Makes-It-Easier-to-Build-Hands-Fr
Now the wake up word (or voice activation) is provided. I will test the AVS/Alexa sample code during the next weeks: https://github.com/alexa/alexa-avs-sample-app/wiki/Raspberry-Pi
Or do I missed a „ready to use“ Alexa module for magic mirror?
kin regards, mick
PS: about limitations (of request etc.) I do not know, and I did not read the AVS documentation now.