Control audio playback on TonieBox from TeddyCloud (Smart Speaker lite)

tl;dr: Is it possible to control / trigger audio playback on the TonieBox from the cloud?

I successfully setup my TeddyCloud for my ESP32 Toniebox with Home Assistant (see my post describing it). My goal would be that my motion sensor, connected to Home Assistant, triggers audio playback on the TonieBox. I can control Home Assistant with the Tonies, but does it work vice versa?

No, there is no possibility to send data to the box without a custom firmware.

With “custom firmware” you do not mean the patched certs of Toniebox, but really custom firmware with lots of changes, right?

Imo adding this feature means writing it from scratch as Toniebox is designed to be the puppetee and not the puppet?

Yes, I am mean a full custom firmware like we started with teddybox (not usable state!).