{
  "$schema": "../../schema/test-vector.schema.json",
  "name": "Header - Protocol Versions",
  "spec_ref": "src/02-header.md",
  "protocol_version": 0,
  "description": "Tests encoding of all 4 protocol version values in header bits 6-7. Uses ACK (type=3) with FLOOD routing as a simple baseline.",
  "vectors": [
    {
      "id": "ver-000",
      "description": "Version 0 (V1, current) - bits 6-7 = 00",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "0D 00 01000000",
      "notes": "Header: (0<<6)|(3<<2)|1 = 0x0D. Version 0 = V1."
    },
    {
      "id": "ver-001",
      "description": "Version 1 (V2, reserved) - bits 6-7 = 01",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 1,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "4D 00 01000000",
      "notes": "Header: (1<<6)|(3<<2)|1 = 0x4D. Version 1 = V2 (reserved)."
    },
    {
      "id": "ver-002",
      "description": "Version 2 (V3, reserved) - bits 6-7 = 10",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 2,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "8D 00 01000000",
      "notes": "Header: (2<<6)|(3<<2)|1 = 0x8D. Version 2 = V3 (reserved)."
    },
    {
      "id": "ver-003",
      "description": "Version 3 (V4, reserved) - bits 6-7 = 11",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 3,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "00000001"
        }
      },
      "binary": "CD 00 01000000",
      "notes": "Header: (3<<6)|(3<<2)|1 = 0xCD. Version 3 = V4 (reserved)."
    }
  ]
}