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Co-authored-by: Thomas Rupprecht <rupprecht.thomas@gmail.com> Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com> Co-authored-by: Jonathan Swoboda <154711427+swoboda1337@users.noreply.github.com> Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
72 lines
2.7 KiB
C++
72 lines
2.7 KiB
C++
#pragma once
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#include <cstdint>
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namespace esphome::dlms_meter {
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/*
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+-------------------------------+
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| Ciphering Service |
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+-------------------------------+
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| System Title Length |
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+-------------------------------+
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| System |
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| Title |
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+-------------------------------+
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| Length | (1 or 3 Bytes)
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+-------------------------------+
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| Security Control Byte |
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+-------------------------------+
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| Frame |
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| Counter |
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+-------------------------------+
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~ ~
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Encrypted Payload
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~ ~
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+-------------------------------+
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Ciphering Service: 0xDB (General-Glo-Ciphering)
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System Title Length: 0x08
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System Title: Unique ID of meter
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Length: 1 Byte=Length <= 127, 3 Bytes=Length > 127 (0x82 & 2 Bytes length)
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Security Control Byte:
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- Bit 3…0: Security_Suite_Id
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- Bit 4: "A" subfield: indicates that authentication is applied
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- Bit 5: "E" subfield: indicates that encryption is applied
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- Bit 6: Key_Set subfield: 0 = Unicast, 1 = Broadcast
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- Bit 7: Indicates the use of compression.
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*/
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static constexpr uint8_t DLMS_HEADER_LENGTH = 16;
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static constexpr uint8_t DLMS_HEADER_EXT_OFFSET = 2; // Extra offset for extended length header
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static constexpr uint8_t DLMS_CIPHER_OFFSET = 0;
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static constexpr uint8_t DLMS_SYST_OFFSET = 1;
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static constexpr uint8_t DLMS_LENGTH_OFFSET = 10;
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static constexpr uint8_t TWO_BYTE_LENGTH = 0x82;
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static constexpr uint8_t DLMS_LENGTH_CORRECTION = 5; // Header bytes included in length field
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static constexpr uint8_t DLMS_SECBYTE_OFFSET = 11;
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static constexpr uint8_t DLMS_FRAMECOUNTER_OFFSET = 12;
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static constexpr uint8_t DLMS_FRAMECOUNTER_LENGTH = 4;
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static constexpr uint8_t DLMS_PAYLOAD_OFFSET = 16;
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static constexpr uint8_t GLO_CIPHERING = 0xDB;
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static constexpr uint8_t DATA_NOTIFICATION = 0x0F;
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static constexpr uint8_t TIMESTAMP_DATETIME = 0x0C;
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static constexpr uint16_t MAX_MESSAGE_LENGTH = 512; // Maximum size of message (when having 2 bytes length in header).
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// Provider specific quirks
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static constexpr uint8_t NETZ_NOE_MAGIC_BYTE = 0x81; // Magic length byte used by Netz NOE
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static constexpr uint8_t NETZ_NOE_EXPECTED_MESSAGE_LENGTH = 0xF8;
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static constexpr uint8_t NETZ_NOE_EXPECTED_SECURITY_CONTROL_BYTE = 0x20;
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} // namespace esphome::dlms_meter
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