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Uppdatera med externa referenser om Norska porten
Google search says that Kamstrup at least sell a Kamstrup HAN-module with "HAN-NVE" RJ45 HAN interface with part number 6840004 which according to its specifications listed in the datasheet it looks like the reader needs to comply with MBUS EN-13757-2 standard as per recommendation from NVE (Norwegian Water Resources and Energy Directorate) for Norway, a.k.a. AMS+HAN version 2.0 or IEC 62056-7-5, annex D ”MBUS” slave.
https://www.nek.no/wp-content/uploads/2018/10/Kamstrup-HAN-NVE-interface-description_rev_3_1.pdf
https://www.nek.no/wp-content/uploads/2017/10/AMS-HAN-personvernnotat-h%C3%B8ringsversjon.pdf
https://byggebolig.no/imageoriginals/88b3d1774ecb41e6a3fe067ae9e6a893.pdf
https://www.energiforetagen.se/globalassets/energiforetagen/det-erbjuder-vi/publikationer/branschrekommendation-lokalt-granssnitt-v1-2-2018.pdf
https://www.utomhusliv.se/wp-content/uploads/2020/10/Specifikation-f%C3%B6r-HAN-modulen-f%C3%B6r-elm%C3%A4tare-engelska.pdf
Google also says that Aidon AMI system smart meters use the same type of HAN-NVE HAN with RJ45 port with M-Bus interface:
https://www.skekraft.se/wp-content/uploads/2021/03/Aidon_Feature_description_RJ45_HAN_Interface_EN.pdf
https://www.tekniskaverken.se/siteassets/tekniska-verken/elnat/aidonfd-rj45-han-interface-se-v13a.pdf
There looks to be some guides for parsing the protocol and getting the data through some kind of M-Bus converter here:
https://www.kode24.no/guider/smart-meter-part-1-getting-the-meter-data/71287300
https://xipher.dk/posts/2020-05-17-using-esp8266-to-monitor-kamstrup-omnipower/
https://github.com/Claustn/esp8266-kamstrup-mqtt
https://github.com/roarfred/AmsToMqttBridge/blob/master/Samples/Kaifa/readme.md
https://github.com/roarfred/AmsToMqttBridge/blob/master/Samples/Kamstrup/obisdata.md
"The meter acts as Mbus master pushing data. To read the information, a circuit for Mbus' slave is needed."
"They are following the DLMS (Device Language Message Specification) protocol and are sent inside HDLC frames and contains OBIS (Object Identification System) codes that describe the electricity usage. Everything is part of IEC 62056 which is a set of standards for electricity metering data exchange."