Smartmeter Landis+Gyr E450: SML format in Switzerland (EWB)

[TheNetStriker]

I just got my new Landis+Gyr E450 Smartmeter in Switzerland (EWB) and I tried to get the data from it using various posts I found here. But none of the SML messages I found seem to match the format my Smartmeter sends. So I invested some time to analyze the SML message.

What I found out so far is that this smartmeter first sends a header with all the OBIS codes that are transmitted. The data from the codes is transmitted after the header.

Here is an examle of the data and what I found out so far. (I obfuscated the smartmeter ID)

02 05 01 05 02 04 12 00 28 09 06 00 08 19 09 00 ff 0f  header 0-8 25.9.0
02 12 00 00 02 04 12 00 28 09 06 00 08 19 09 00 ff 0f  header 0-8 25.9.0
01 12 00 00 02 04 12 00 01 09 06 00 00 60 01 01 ff 0f  header 0-0 96.1.1
02 12 00 00 02 04 12 00 03 09 06 01 00 01 07 00 ff 0f  header 1-0 1.7.0
02 12 00 00 02 04 12 00 03 09 06 01 00 02 07 00 ff 0f  header 1-0 2.7.0
02 12 00 00 09 06 00 08 19 09 00 ff                               header 0-8 25.9.0
09                                                                                    Begin of data?
06                                                                                    Start of value
31 32 33 34 35 36                                                           Smartmeter id
06                                                                                    Start of value
00 00 01 b3                                                                     OBIS 1.7.0 data
06                                                                                    Start of value
00 00 00 00                                                                     OBIS 2.7.0 data
00 01 b3 06 00 00 00 00                                                 Same data again?

At the moment the only way to read this data is by extracting the raw bytes with offsets. But this would cause problems if they change what is transmitted in each packet after some time

Does anyone know what kind of SML standard this is? And could this standard be implemented in Tasmota?