Please specify what doesn't work.
You have debug verbosity on which shows that your sensor on/of signal as such is recognized by pimatic.
Your used class is correct as well.
Did you specify the protocol in the mysensors plugin?
{
"plugin": "mysensors",
"driver": "serialport",
"protocols": "1.5.4",
"driverOptions": {
"serialDevice": "/dev/ttyUSB0",
"baudrate": 115200
}
},
The plugin still defaults to the 1.4 protocol.
Edit: Also check Getting started with MySensors in the pimatic forum.