Screen and chat packets

Server-to-client records about screen handlers, inventories, trades, the recipe book, chat, titles, the tab list, the scoreboard and connection housekeeping. All 63 arrive through PacketReceiveEvent and none of them can be sent; text in them is a plain string, an item is a namespaced id plus a count, and an enum component is null when the vanilla constant has no same-named twin — Packets.

on<PacketReceiveEvent> { e ->
    val packet = e.packet()
    if (packet !is S2CScreenHandlerSlotUpdatePacket) return@on
    if (packet.item() == "minecraft:air") return@on

    log.info("slot ${packet.slot()}: ${packet.item()} x${packet.count()}")
}

#S2CAdvancementUpdatePacket

Advancement list sync; the earned and progress maps and the display data are not exposed.

#S2CBossBarPacket

Boss bar added, removed or updated; title, percent, colour and style are not exposed.

#S2CBundleDelimiterPacket

Marks the boundary of a packet bundle. No components.

#S2CBundlePacket

Packet bundle wrapper; each contained packet fires its own event. No components.

#S2CChatMessagePacket

Signed player chat; the signed body text and the signature data are not exposed.

#S2CChatSuggestionsPacket

Server-driven chat completion list.

#S2CClearDialogPacket

Closes the open server dialog. No components.

#S2CClearTitlePacket

Clears the title and the subtitle.

#S2CCloseScreenPacket

The server closes a screen handler.

#S2CCommandSuggestionsPacket

Tab-completion reply; the suggestion tooltips are not exposed.

#S2CCommandTreePacket

Brigadier command tree; the tree itself is not exposed. No components.

#S2CCommonPingPacket

Server ping; the client answers with C2SCommonPongPacket.

#S2CCookieRequestPacket

The server asks for a stored cookie.

#S2CCooldownUpdatePacket

Item-use cooldown set or cleared.

#S2CCraftFailedResponsePacket

A recipe-book craft request was rejected.

#S2CCustomPayloadPacket

Plugin-channel message; the payload bytes are not exposed.

#S2CCustomReportDetailsPacket

Key/value details the server wants attached to crash reports.

#S2CDebugSamplePacket

Debug profiler sample push.

#S2CDisconnectPacket

The server disconnects the client.

#S2CEnterReconfigurationPacket

The connection moves to the configuration phase. No components.

#S2CEventDebugPacket

Debug event push; no fields are exposed. No components.

#S2CGameMessagePacket

System message; player chat arrives as S2CChatMessagePacket instead.

#S2CInventoryPacket

Full contents resend for one screen handler.

#S2CInventoryPacket.Stack

One entry of contents().

#S2CKeepAlivePacket

Keep-alive; the client echoes the id back in C2SKeepAlivePacket.

#S2CNbtQueryResponsePacket

Reply to C2SQueryBlockNbtPacket or C2SQueryEntityNbtPacket.

#S2COpenMountScreenPacket

Opens the horse or mount inventory screen.

#S2COpenScreenPacket

Opens a container screen.

#S2COpenWrittenBookPacket

Opens the written-book reader for the held book.

#S2COverlayMessagePacket

Action bar text.

#S2CPlayerListHeaderPacket

Tab-list header and footer.

#S2CPlayerListPacket

Tab-list update; the per-player entries are not exposed, only which fields changed.

#S2CPlayerRemovePacket

Players removed from the tab list.

#S2CProfilelessChatMessagePacket

Chat message with no player profile behind it: console output, command output.

#S2CRecipeBookAddPacket

Recipe-book entries added; the entries themselves are not exposed.

#S2CRecipeBookRemovePacket

Recipe-book entries removed.

#S2CRecipeBookSettingsPacket

Per-category recipe-book UI settings; no fields are exposed. No components.

#S2CRemoveMessagePacket

The server deletes a chat message it sent; the signature is not exposed. No components.

#S2CResourcePackRemovePacket

Removes a server resource pack.

#S2CResourcePackSendPacket

The server offers a resource pack.

#S2CScoreboardDisplayPacket

Assigns an objective to a display slot.

#S2CScoreboardObjectiveUpdatePacket

Objective created, removed or updated; the number format is not exposed.

#S2CScoreboardScoreResetPacket

Removes score entries.

#S2CScoreboardScoreUpdatePacket

Score value set; the number format is not exposed.

#S2CScreenHandlerPropertyUpdatePacket

One screen handler property: furnace progress, enchantment levels, beacon effect.

#S2CScreenHandlerSlotUpdatePacket

One slot's contents changed.

#S2CSelectAdvancementTabPacket

The server switches the open advancement tab.

#S2CServerLinksPacket

Server-provided links; the link labels are not exposed.

#S2CServerMetadataPacket

In-play server metadata; the favicon bytes are not exposed.

#S2CServerTransferPacket

The server tells the client to connect elsewhere.

#S2CSetCursorItemPacket

Sets the stack held on the mouse cursor.

#S2CSetPlayerInventoryPacket

Sets one player-inventory slot outside any open handler.

#S2CSetTradeOffersPacket

Villager or wandering-trader offer list.

#S2CSetTradeOffersPacket.Offer

One trade.

#S2CShowDialogPacket

Opens a server dialog; the dialog contents are not exposed. No components.

#S2CSignEditorOpenPacket

Opens the sign text editor.

#S2CStatisticsPacket

Statistics screen data.

#S2CStatisticsPacket.Stat

One statistic.

#S2CStoreCookiePacket

The server stores a cookie on the client; the payload bytes are not exposed.

#S2CSubtitlePacket

Title subtitle line.

#S2CSynchronizeRecipesPacket

Recipe registry sync; the recipes are not exposed. No components.

#S2CSynchronizeTagsPacket

Registry tag sync; the tags are not exposed. No components.

#S2CTeamPacket

Scoreboard team created, updated or removed, or members added to it and removed from it.

The seven detail components from displayName() down are null unless the packet carries team data, that is on create and update.

#S2CTitleFadePacket

Title animation timings.

#S2CTitlePacket

Title main line.

#S2CUpdateSelectedSlotPacket

The server forces the hotbar selection.