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nte-exporter/docs/packet-format.md
Golumpa 354b0e9232 Decode reward keys and use mapping files 
Add decoding for Monopoly reward keys and switch reward metadata to be looked up by decoded id. Implement decode_reward_key() and infer_reward_type(); replace the previous raw-key KNOWN_REWARDS approach with REWARDS_BY_ID built from mappings/*.json. Add mappings/items.json and expand mappings/arcs.json. Update decoder to produce reward_id, use REWARDS_BY_ID, and change guess_quantity() to accept reward_id. Refactor pool_mappings to reuse the new mapping loader, and update tests and docs to validate mapping files and document the reward key encoding/behavior.
2026-06-11 11:09:02 +01:00

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Packet Format Notes

This prototype supports separate Monopoly and Arc/Gashapon history decoders.

Monopoly

  • History is fetched over the UDP game connection.
  • Client history-page requests are 45 bytes.
  • History request constant: 4220 / 0x107c.
  • Request selector 4: Lottery_Permanent.
  • Request selector 8: Lottery_LimitedCharacter.
  • Request page cursor: page_number * 4.
  • Normal server responses contain 5 history records.
  • The final page may contain fewer than 5 records.

Decoded fields:

  • roll_result = first u32 / 4
  • roll_result = 0 means Points Gift
  • Some page-first records have a short prefix before the record body. For these, a hidden signed source flag immediately after the visible dice field overrides the visible dice:
    • source_flag = 0 means Points Gift
    • source_flag = -4 means Chase Reward
  • Timestamp is an 8-byte little-endian value
  • unix_seconds = little_endian_u64(timestamp_raw) / 40000000 - 62135596800
  • Reward keys are the reward id string encoded one character per byte as ASCII * 4 with carry chaining into the next byte. The final byte is the pending carry (00 or 01) acting as a terminator, or is omitted. Examples: 98bdc9ad7dd9a5b99501 decodes to fork_vine, 10a58d9539bdc9b585b101 to DiceNormal, c4c0cccc00 to character id 1033. Arc/Gashapon history uses the same scheme at ASCII * 2.
  • The decoder decodes the key to its id string and looks up display metadata in mappings/arcs.json, mappings/characters.json, and mappings/items.json. Unknown rewards still export their decoded id with empty name/rank.

Page and row numbers are research metadata only. They must not be used for permanent dedupe because they shift when new history appears.

Timestamp groups keep all records with the same raw timestamp together for UID ordinal generation. For boundary/group-size detection, only result_type = dice rows count as pull-set members; Points Gift and Chase Reward rows stay in the group but do not increase the dice-only group count.

Arc / Gashapon

  • Arc history uses a separate 34-byte request.
  • Request constant: 2060 / 0x080c.
  • Cursor step: 2.
  • Pool: Arc_MiracleBox.
  • Each response page normally contains 5 records.
  • Arc timestamps use unix_seconds = little_endian_u64(timestamp_raw) / 20000000 - 62135596800.
  • Arc pulls are treated as 10-pull timestamp groups; incomplete groups are skipped by default.
  • Arc rows use the same reward_type, reward_id, reward_name, reward_rank, and reward_key_hex fields as Monopoly rows.