DSMR Slimme Meter integration v5L for Luxembourgish meters seems to not work

[koosoli]

The problem

Hi,
I am on HA 2022.2.8 on Rasbarry Pi 3. I live in Luxembourg and my meter is a Sagemcom T210D.
A bought this cable "DSD TECH SH-RJ12A USB to RJ12 6P6C Serial Cable with FTDI Chip Compatible for Iskra AM550 Sagemcom XS210" https://www.amazon.de/gp/product/B07R2L22GW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1 that I connected to one of the USB ports.
The official DSMR Slimme integration is unable to connect to it unless I change to v5 instead of v5L but then I can not put in my P1 encryption key that all Luxembourgish meters require to read the signals. So I get no values.

What version of Home Assistant Core has the issue?

2022.2.8

What was the last working version of Home Assistant Core?

2022.2.8

What type of installation are you running?

Home Assistant OS

Integration causing the issue

No response

Link to integration documentation on our website

No response

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[probot-home-assistant]

dsmr documentation
dsmr source
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[probot-home-assistant]

Hey there @RobBie1221, @frenck, mind taking a look at this issue as it has been labeled with an integration (dsmr) you are listed as a code owner for? Thanks!
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[frenck]

The use of the variant with an encryption key, is not available for this integration.
This is not a bug; but a feature request.

If you want to suggest a feature, you should try our Community Forum: Feature Requests.

If you have additional questions, feel free to join our Discord chat server.

Thanks! 👍