{
  "$schema": "../../schema/test-vector.schema.json",
  "name": "ACK Payload - Basic",
  "spec_ref": "src/04-payload-ack.md",
  "protocol_version": 0,
  "description": "Basic ACK payload encoding/decoding tests with various CRC values.",
  "vectors": [
    {
      "id": "ack-001",
      "description": "ACK with CRC 0xDEADBEEF",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "DEADBEEF"
        }
      },
      "binary": "0D 00 EFBEADDE",
      "notes": "CRC 0xDEADBEEF stored as little-endian: EF BE AD DE."
    },
    {
      "id": "ack-002",
      "description": "ACK with CRC 0x00000001",
      "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"
    },
    {
      "id": "ack-003",
      "description": "ACK with CRC 0x12345678",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "flood"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 0,
          "hashes": []
        },
        "payload": {
          "ack_crc": "12345678"
        }
      },
      "binary": "0D 00 78563412"
    },
    {
      "id": "ack-004",
      "description": "ACK via direct routing with path",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "direct"
        },
        "path": {
          "hash_size": 1,
          "hash_count": 2,
          "hashes": [
            "AA",
            "BB"
          ]
        },
        "payload": {
          "ack_crc": "CAFEBABE"
        }
      },
      "binary": "0E 02 AABB BEBAFECA",
      "notes": "Direct routed ACK. CRC 0xCAFEBABE as LE = BEBAFECA."
    },
    {
      "id": "ack-005",
      "description": "ACK with 2-byte hash path",
      "type": "encode_decode",
      "structured": {
        "header": {
          "version": 0,
          "payload_type": "ack",
          "route_type": "direct"
        },
        "path": {
          "hash_size": 2,
          "hash_count": 1,
          "hashes": [
            "AABB"
          ]
        },
        "payload": {
          "ack_crc": "00000000"
        }
      },
      "binary": "0E 41 AABB 00000000",
      "notes": "path_len=0x41: hash_size=2, count=1."
    }
  ]
}