Dear JeeLet,
I already read those topic.
But I read it again and make several test again.
I'm not able to receive a message from NOTIFY.

I would prefer to have a TEXT box in HA to send a value to a NODE, but is seems such feature doesn't exist.
For me, it is a standard I use in SCADA system since 30 years.
We need to put device in AUTO/MANUAL and SET a static value (Valve).
Or another example is to SET a Setpoint (for a thermostat).

Maybe I miss something and I have to read a bit more.