From firmware 5.0.4 the original Toon resources also include libraries for QT5 websockets!
To use the libraries install them when having the VPN running with "opkg install libqt5websockets5" (I will probably add an option to the update-script to install this for you soon).
After this you can use the library in your qml code with "import QtWebSockets 1.0"
From there just use the docs at https://doc.qt.io/qt-5/qtwebsockets-qmlmodule.html and the examples at https://doc.qt.io/qt-5/qtwebsockets-examples.html
Using websockets in your qml code would allow your Toon to be externally controlled. Much more possibilities then the current ones using the /happ_thermstat (and other) urls which only supports a few commands.
For example, the use case where a forum members wants to put a doorbell-camera picture on the Toon when someone is ringing the phone could now be implemented easily. Much more ideas are welcome!