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참고자료: https://www.bluetooth.com/specifications/specs/core-specification-5-3/
* 가로 형태의 ATT PDU는 "ATT Opcode (ATT PDU) - 가로 버전" 참고
| Attribute protocol PDUs | |||
| 분류 | Attribute Opcode (1 octet) |
Parameter | |
| Error handling |
0x01 | ATT_ERROR_RSP | Error가 발생한 Request Opcode (1 octet) |
| Error가 발생한 Attribute Handle (2 octet) |
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| Error Code: 에러가 발생한 이유 (1 octet) |
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| MTU exchange |
0x02 | ATT_EXCHANGE_MTU_REQ | Client에서 수신 가능한 MTU 크기 (2 octet) |
| 0x03 | ATT_EXCHANGE_MTU_RSP | Server에서 수신 가능한 MTU 크기 (2 octet) |
|
| Find information |
0x04 | ATT_FIND_INFORMATION_REQ | 첫번째 Handle (2 octet) |
| 마지막 Handle (2 octet) |
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| 0x05 | ATT_FIND_INFORMATION_RSP | Information data의 포맷 (1 octet) - 0x01: 16-bit Bluetooth UUID - 0x02: 128-bit Bluetooth UUID |
|
| Information data (4 ~ ATT_MTU-2 octet) Information data 1 - Handle(2 octet) - 16-bit Bluetooth UUID(2 octet) Information data 2 - Handle(2 octet) - 128-bit Bluetooth UUID(16 octet) |
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| 0x06 | ATT_FIND_BY_TYPE_VALUE_REQ | 첫번째 Handle (2 octet) |
|
| 마지막 Handle (2 octet) |
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| 찾을 Attribute Type (UUID) (2 octet) |
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| 찾을 Attribute Value (0 ~ ATT_MTU-7 octet) |
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| 0x07 | ATT_FIND_BY_TYPE_VALUE_RSP | Handle Information List (4 ~ ATT_MTU-1 octet) Handle Information 포맷 - 찾은 Attribute value(2 octet) - Group End Handle(2 octet) |
|
| Reading attribute |
0x08 | ATT_READ_BY_TYPE_REQ | 첫번째 Handle (2 octet) |
| 마지막 Handle (2 octet) |
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| Attribute Type (UUID) (2 or 16 octet) |
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| 0x09 | ATT_READ_BY_TYPE_RSP | Length (1 octet) |
|
| Attribute Data List (2 ~ ATT_MTU-2 octet) Attribute Data 포맷 - Attribute Handle(2 octet) - Attribute Value(Length-2 octet) |
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| 0x0A | ATT_READ_REQ | Attribute Handle (2 octet) |
|
| 0x0B | ATT_READ_RSP | Attribute Value (0 ~ ATT_MTU-1 octet) |
|
| 0x0C | ATT_READ_BLOB_REQ | Attribute Handle (2 octet) |
|
| Value Offset (2 octet) |
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| 0x0D | ATT_READ_BLOB_RSP | Part Attribute value (0 ~ ATT_MTU-1 octet) |
|
| 0x0E | ATT_READ_MULTIPLE_REQ | Attribute Handle Set (4 ~ ATT_MTU-1 octet) |
|
| 0x0F | ATT_READ_MULTIPLE_RSP | Value Set (0 ~ ATT_MTU-1 octet) |
|
| 0x10 | ATT_READ_BY_GROUP_TYPE_REQ | 첫번째 Handle (2 octet) |
|
| 마지막 Handle (2 octet) |
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| Attribute Type (UUID) (2 or 16 octet) |
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| 0x11 | ATT_READ_BY_GROUP_TYPE_RSP | Length (1 octet) |
|
| Attribute Data List (4 ~ ATT_MTU-2 octet) Attribute Data 포맷 - Attribute Handle(2 octet) - End Group Handle(2 octet) - Attribute Value(Length-4 octet) |
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| 0x20 | ATT_READ_MULTIPLE_VARIABLE_REQ | Attribute Handle Set (4 ~ ATT_MTU-1 octet) |
|
| 0x21 | ATT_READ_MULTIPLE_VARIABLE_RSP | Length Value Tuple의 List (4 ~ ATT_MTU-1 octet) Length Value Tuple 포맷 - Attribute Value의 Length(2 octet) - Attribute Value(Length octet) |
|
| Writing attribute |
0x12 | ATT_WRITE_REQ | Attribute Handle (2 octet) |
| Attribute Value (0 ~ ATT_MTU-3 octet) |
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| 0x13 | ATT_WRITE_RSP | No Parameter | |
| 0x52 | ATT_WRITE_CMD | Attribute Handle (2 octet) |
|
| Attribute Value (0 ~ ATT_MTU-3 octet) |
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| 0xD2 | ATT_SIGNED_WRITE_CMD | Attribute Handle (2 octet) |
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| Attribute Value (0 ~ ATT_MTU-15 octet) |
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| Authentication Signature (12 octet) |
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| Queued write |
0x16 | ATT_PREPARE_WRITE_REQ | Attribute Handle (2 octet) |
| Value Offset (2 octet) |
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| Part Attribute value (0 ~ ATT_MTU-5 octet) |
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| 0x17 | ATT_PREPARE_WRITE_RSP | Attribute Handle (2 octet) |
|
| Value Offset (2 octet) |
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| Part Attribute value (0 ~ ATT_MTU-5 octet) |
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| 0x18 | ATT_EXECUTE_WRITE_REQ | Flag (1 octet) Flag - 0x00: 모든 prepared write 취소 - 0x01: 남아있는 모든 prepared value를 write |
|
| 0x19 | ATT_EXECUTE_WRITE_RSP | No Parameter | |
| Server initiated |
0x1B | ATT_HANDLE_VALUE_NTF | Attribute Handle (2 octet) |
| Attribute Value (0 ~ ATT_MTU-3 octet) |
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| 0x1D | ATT_HANDLE_VALUE_IND | Attribute Handle (2 octet) |
|
| Attribute Value (0 ~ ATT_MTU-3 octet) |
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| 0x1E | ATT_HANDLE_VALUE_CFM | No Parameter | |
| 0x23 | ATT_MULTIPLE_HANDLE_VALUE_NTF | Handle Length Tuple의 List (8 ~ ATT_MTU-1 octet) Handle Length Tuple 포맷 - Attribute Handle(2 octet) - Attribute Value의 Length(2 octet) - Attribute value(Length octet) |
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