🚀 Feature: OCMF support

[xBlaz3kx]

🔖 Feature description

Add support for sending signed measurements (with OCMF)

🎤 Why is this feature needed ?

Eichrecht compatibility

✌️ How do you aim to achieve this?

If configured, signing MeterValue measurements and sending signed values to the backend.

🔄️ Additional Information

No response

👀 Have you spent some time to check if this feature request has been raised before?

• I checked and didn't find similar issue