You would need to get in touch with the telecom regulator in Germany, the should be able to point you at the regulations.
2.4Ghz in Europe, licence excempt, is mostly 10dBm and 100% duty cycle, but the exact settings you can use are set at country level, so Germany might have some areas you need to stay out of.
The SX1280 is limited to 13dBm in any case.
Whats the detail of the application, I am always interested what people are doing with this almost unknown device ?
Thanks for the info.
It's a more general system I'm planning to use for multiple things.
I started working on it for a watering system for a few fields of crop. They need the date and time and I wanted to also collect data from soil moisture, air pressure etc. and it needs to be sent to a central system. Problem is none of the fields have an internet connection and sim cards have running costs that I don't want.
I'm planning on using it later for other projects like control and telemetry for a drone.
The device simply ticks all the boxes I want. Easy regulations like 100% duty cycle and 2.4ghz, long distance, rather good bitrates etc.