goober/nte-exporter
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nte-exporter/docs/packet-format.md
Golumpa 30dc4e4831 Export oldest boundary when dice %10==0 
Allow an oldest-boundary timestamp group to be exported when its dice-only record count is a positive multiple of 10. This adds a dice_complete check in the boundary annotation logic so a proved-finished pull set on a full final page is exported (unseen continuation rows can only be non-dice tails that sort after seen rows, keeping ordinals/UIDs stable). Docs and README updated to explain the rule, and tests updated/expanded to cover dice-complete, partial, and newest-boundary behaviors.
2026-06-11 11:21:42 +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.

Oldest-boundary groups are exported when their dice-only count is a positive multiple of 10: the pull set is provably finished, and any unseen same-timestamp continuation rows can only be non-dice tails that sort after the seen rows, so exported ordinals and UIDs stay stable. Oldest groups with other dice counts are still dropped unless the capture reached the true end of history. Newest-boundary groups remain positional-only: when a scan starts mid-history, unseen newer rows would shift ordinals, so dice count is never accepted as proof there.

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.