Difference between revisions of "Pre-release protocol"

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(13w39a)
(Updated to 1.21-pre2)
 
Line 1: Line 1:
−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.6.2, protocol 74) to the current pre-release. Note that this page contains bleeding-edge information that may not be completely or correctly documented.
+
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.20.6, protocol 766]]) to the current pre-release (currently [[Protocol version numbers|1.21-pre2, protocol {{Snapshot PVN|1073742024}}]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
−
He who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occured to the respective packets there.
 
  
−
== Protocol History ==
+
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
−
13w36a - Added sound category byte to 0x3E
 
−
- Changed 0xC8 to a string:int map
 
  
−
13w37b -
+
== Contents ==
  
−
1.6.3 - Terrain fixes to help moving to 1.7, no packet changes from 1.6.2
+
<div style="float:right;">__TOC__</div>
  
−
1.6.4 -
+
=== Data types ===
  
−
13w38a/b/c -
+
No changes documented so far.
  
−
13w39a - UUIDs added to spawn named entity, game state 'gamemode' byte -> float
+
=== Packets ===
  
−
== Protocol Version ==
+
{| class="wikitable"
−
13w39a - 80
+
! ID
 +
! Packet name
 +
!colspan="2"| Documentation
 +
|-
 +
!colspan="4"| Configuration clientbound
 +
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
 +
{{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
 +
{{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
 +
|-
 +
|}
  
−
13w38a/b/c - 79
+
== Handshake ==
  
−
1.6.4 - 78
+
No changes so far.
  
−
1.6.3 - 77
+
== Status ==
  
−
13w37b - 76
+
No changes so far.
  
−
13w36a - 75
+
== Login ==
  
−
== New Packets ==
+
No changes so far.
−
None
 
  
−
== Changed Packets ==
+
== Configuration ==
−
{{anchor|0x03}}
 
−
=== Chat Message (0x03) ===
 
  
−
The message from the server to the client can currently handle
+
=== Clientbound ===
−
* A normal string that doesn't begin with ", { or [
 
−
* A JSON string
 
−
* A JSON array
 
−
* A JSON object
 
  
−
The JSON format works as follows (minus the //comments):
+
==== Clientbound Report Details (configuration) ====
−
    {
 
−
        // Plain text
 
−
        "text": "Hello world",
 
−
        //or
 
−
        // Translatable string
 
−
        "translate": "multiplayer.player.joined",
 
−
        "with": [
 
−
            //This can be replaced another json object allowing the parts
 
−
            //to be styled/translated seperately
 
−
            "thinkofdeath",
 
−
        ],
 
−
        //Items in the extra section will be appended to the message.
 
−
        //They can strings or json objects. If included the array must
 
−
        //not be empty
 
−
        "extra": [
 
−
            "Testing",
 
−
            {"translate":"demo.day.2"}
 
−
        ],
 
−
        //Controls whether the text is bold or not. Default false
 
−
        "bold":true,
 
−
        //Controls whether the text is italic or not. Default false
 
−
        "italic":false,
 
−
        //Controls whether the text is underlined or not. Default false
 
−
        "underlined": false,
 
−
        //Controls whether the text is striked out or not. Default false
 
−
        "strikethrough": false,
 
−
        //Controls whether the text is randomised constantly or not. Default false
 
−
        "obfuscated": false,
 
−
        //Controls the color of the text
 
−
        //Supported 'colors':
 
−
        // * black
 
−
        // * dark_blue
 
−
        // * dark_green
 
−
        // * dark_aqua
 
−
        // * dark_red
 
−
        // * dark_purple
 
−
        // * gold
 
−
        // * gray
 
−
        // * dark_gray
 
−
        // * blue
 
−
        // * green
 
−
        // * aqua
 
−
        // * red
 
−
        // * light_purple
 
−
        // * yellow
 
−
        // * white
 
−
        // * obfuscated
 
−
        // * bold
 
−
        // * strikethrough
 
−
        // * underline
 
−
        // * italic
 
−
        // * reset
 
−
        "color":"red",
 
−
        //Executes the action once the text is clicked
 
−
        "clickEvent":{
 
−
            //The action to execute
 
−
            //Supported actions:
 
−
            // * open_url
 
−
            // * open_file
 
−
            // * run_command
 
−
            // * suggest_command
 
−
            "action":"run_command",
 
−
            //The value to run the action with
 
−
            //open_url: Url to open
 
−
            //open_file: File to open
 
−
            //run_command: Command to execute
 
−
            //suggest_command: Text to place in the player's text box
 
−
            "value": "/time set day",
 
−
        },
 
−
        //Displays the action apon hovering over the text
 
−
        "hoverEvent": {
 
−
            //The action to execute
 
−
            //Supported actions
 
−
            // * show_text
 
−
            // * show_achievement
 
−
            // * show_item
 
−
            "action":"show_text",
 
−
            //The value to the action with
 
−
            //show_text: Text to display can be a JSON object
 
−
            //show_achievement: Name of the achievemnt to display e.g: "achievement.openInventory"
 
−
            //show_item: JSON version of the item, must be quoted. e.g: "{id:35,Damage:5,Count:2,tag:{display:{Name:Testing}}}"
 
−
            "value": "Hello",
 
−
        },
 
−
    }
 
  
−
{{anchor|0x14}}
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
−
=== Spawn Named Entity (0x14) ===
 
−
''Server to Client''
 
  
−
The only named entities (at the moment) are players (either real or NPC/Bot). This packet is sent by the server when a player comes into visible range, '''not''' when a player joins.
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="3"| 0x0F
 +
| rowspan="3"| Configuration
 +
| rowspan="3"| Client
 +
| colspan="2"| Details Count
 +
| colspan="2"| {{Type|VarInt}} (32)
 +
| The number of details in the following array.
 +
|-
 +
| rowspan="2"| Details
 +
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 +
|}
  
−
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
+
==== Clientbound Server Links (configuration) ====
  
−
At one point, the Notchian client was not okay with receiving player entity packets, including 0x14, that refer to its own username or Entity ID; and would teleport to the absolute origin of the map and fall through the Void any time it received them. However, in more recent versions, it appears to handle them correctly, by spawning a new entity as directed (though future packets referring to the entity ID may be handled incorrectly).
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|-
+
! Packet ID
−
| Packet ID
+
! State
−
| Field Name
+
! Bound To
−
| Field Type
+
! colspan="2"| Field Name
−
| Example
+
! colspan="2"| Field Type
−
| Notes
+
! Notes
−
|-
+
|-
−
| rowspan="9" | 0x14
+
| rowspan="4"| 0x10
−
| Entity ID
+
| rowspan="4"| Configuration
−
| int
+
| rowspan="4"| Client
−
| <code>94453</code>
+
| colspan="2"| Links Count
−
| Player ID
+
| colspan="2"| {{Type|VarInt}}
−
|-
+
| The number of links in the following array.
−
| Player Name
+
|-
−
| string
+
| rowspan="3"| Links
−
| <code>Twdtwd</code>
+
| Is built-in
−
| Max length of 16
+
| rowspan="3"| {{Type|Array}}
−
|-
+
| {{Type|Boolean}}
−
| '''Player UUID'''
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| string
+
|-
−
| <code></code>
+
| Label
−
|
+
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
|-
+
| See below.
−
| X
+
|-
−
| int
+
| URL
−
| <code>784</code>
+
| {{Type|String}}
−
| Player X as a [[Data_Types#Fixed-point_numbers|fixed-point number]]
+
| Valid URL.
−
|-
 
−
| Y
 
−
| int
 
−
| <code>2131</code>
 
−
| Player Y as [[Data_Types#Fixed-point_numbers|fixed-point number]]
 
−
|-
 
−
| Z
 
−
| int
 
−
| <code>-752</code>
 
−
| Player Z as [[Data_Types#Fixed-point_numbers|fixed-point number]]
 
−
|-
 
−
| Yaw
 
−
| byte
 
−
| <code>0</code>
 
−
| Player rotation as a packed byte
 
−
|-
 
−
| Pitch
 
−
| byte
 
−
| <code>0</code>
 
−
| Player rotation as a packed byte
 
−
|-
 
−
| Current Item
 
−
| short
 
−
| <code>0</code>
 
−
| The item the player is currently holding. Note that this should be 0 for "no item", unlike -1 used in other packets. A negative value crashes clients.
 
−
|-
 
−
| Metadata
 
−
| [[Entities#Entity_Metadata_Format|Metadata]]
 
−
| <code></code>
 
−
| The 1.3 client crashes on packets with no metadata, but the server can send any metadata key of 0, 1 or 8 and the client is fine.
 
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 24 bytes + length of strings + metadata (at least 1)
 
 
|}
 
|}
  
−
{{anchor|0x3E}}
 
−
=== Named Sound Effect (0x3E) ===
 
−
''Server to client''
 
−
 
−
Used to play a sound effect on the client.
 
−
 
−
All known sound effect names can be seen [https://github.com/SirCmpwn/Craft.Net/blob/master/source/Craft.Net.Common/SoundEffect.cs here].
 
−
 
−
{| class="wikitable"
 
−
|-
 
−
| Packet ID
 
−
| Field Name
 
−
| Field Type
 
−
| Example
 
−
| Notes
 
−
|-
 
−
| rowspan="7" | 0x3E
 
−
| Sound name
 
−
| string
 
−
| step.grass
 
−
| 250
 
−
|-
 
−
| Effect position X
 
−
| int
 
−
| 250
 
−
| effect X multiplied by 8
 
−
|-
 
−
| Effect position Y
 
−
| int
 
−
| 250
 
−
| effect Y multiplied by 8
 
−
|-
 
−
| Effect position Z
 
−
| int
 
−
| 250
 
−
| effect Z multiplied by 8
 
−
|-
 
−
| Volume
 
−
| float
 
−
| 9
 
−
| 1 is 100%, can be more
 
−
|-
 
−
| Pitch
 
−
| byte
 
−
| 1
 
−
| 63 is 100%, can be more
 
−
|-
 
−
| Sound Category
 
−
| Unsigned byte
 
−
| 6
 
−
| Possible values:
 
−
MASTER: 0
 
−
 
−
MUSIC: 1
 
−
 
−
RECORDS: 2
 
−
 
−
WEATHER: 3
 
−
 
−
BLOCKS: 4
 
  
−
MOBS: 5
+
{| class="wikitable" {{added}}
 +
! ID
 +
! Name
 +
! Notes
 +
|-
 +
| 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
  
−
ANIMALS: 6
+
=== Serverbound ===
  
−
PLAYERS: 7
+
No changes so far.
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 21 bytes + length of string
 
−
|}
 
  
 +
== Play ==
  
−
{{anchor|0x46}}
+
=== Clientbound ===
−
=== Change Game State (0x46) ===
 
−
''Server to Client''
 
  
−
This packet appeared with protocol version 10. Currently, it appears when a bed can't be used as a spawn point and when the rain state changes.  it could have additional uses in the future.
+
==== Clientbound Report Details (play) ====
  
−
The class has an array of strings linked to reason codes 0, 1, 2, and 3 but only the codes for 1 and 2 are null.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|-
+
! Packet ID
−
| Packet ID
+
! State
−
| Field Name
+
! Bound To
−
| Field Type
+
! colspan="2"| Field Name
−
| Example
+
! colspan="2"| Field Type
−
| Notes
+
! Notes
−
|-
+
|-
−
| rowspan="2" | 0x46
+
| rowspan="3"| 0x7A
−
| Reason
+
| rowspan="3"| Configuration
−
| byte
+
| rowspan="3"| Client
−
| 0
+
| colspan="2"| Details Count
−
|
+
| colspan="2"| {{Type|VarInt}} (32)
−
|-
+
| The number of details in the following array.
−
| Game mode?
+
|-
−
| '''float'''
+
| rowspan="2"| Details
−
| 0
+
| Title
−
| Used only when reason = 3. 0 is survival, 1 is creative.
+
| rowspan="2"| {{Type|Array}}
−
|-
+
| {{Type|String}} (128)
−
| Total Size:
+
|
−
| colspan="4" | 3 bytes
+
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 
|}
 
|}
  
−
'''Reason codes'''
+
==== Clientbound Server Links (play) ====
−
 
 
−
{| class="wikitable"
 
−
|-
 
−
! Code
 
−
! Effect
 
−
! Text
 
−
|-
 
−
| 0
 
−
| Invalid Bed
 
−
| "tile.bed.notValid"
 
−
|-
 
−
| 1
 
−
| Begin raining
 
−
| null
 
−
|-
 
−
| 2
 
−
| End raining
 
−
| null
 
−
|-
 
−
| 3
 
−
| Change game mode
 
−
| gameMode.changed
 
−
|-
 
−
| 4
 
−
| Enter credits
 
−
|
 
−
|}
 
  
−
{{anchor|0xC8}}
+
This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).
−
=== Increment Statistic (0xC8) ===
 
−
''Server to Client''
 
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|-
+
! Packet ID
−
| Packet ID
+
! State
−
| colspan="2" | Field Name
+
! Bound To
−
| Field Type
+
! colspan="2"| Field Name
−
| Example
+
! colspan="2"| Field Type
−
| Notes
+
! Notes
−
|-
+
|-
−
| rowspan="3" | 0xC8
+
| rowspan="4"| 0x7B
−
| colspan="2" | Count
+
| rowspan="4"| Configuration
−
| int
+
| rowspan="4"| Client
−
| 5
+
| colspan="2"| Links Count
−
| Number of entrys
+
| colspan="2"| {{Type|VarInt}}
−
|-
+
| The number of links in the following array.
−
| Entry
+
|-
−
| Statistic's name
+
| rowspan="3"| Links
−
| string
+
| Is built-in
−
|  
+
| rowspan="3"| {{Type|Array}}
−
|  
+
| {{Type|Boolean}}
−
|-
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| Entry
+
|-
−
| Amount
+
| Label
−
| int
+
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
| 5
+
| See below.
−
| The amount to increase by
+
|-
−
|-
+
| URL
−
| Total Size:
+
| {{Type|String}}
−
| colspan="5" | 9 bytes
+
| Valid URL.
 
|}
 
|}
  
−
{{anchor|0xCD}}
+
{| class="wikitable" {{added}}
−
=== Client Statuses (0xCD) ===
+
! ID
−
''Client to server''
+
! Name
−
 
+
! Notes
−
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
|-
−
 
+
| 0
−
{| class="wikitable"
+
| Bug Report
−
|-
+
| Displayed on connection error screen; included as a comment in the disconnection report.
−
| Packet ID
+
|-
−
| Field Name
+
| 1
−
| Field Type
+
| Community Guidelines
−
| Example
+
|
−
| Notes
+
|-
−
|-
+
| 2
−
| rowspan="1" | 0xCD
+
| Support
−
| Payload
+
|
−
| byte
+
|-
−
| 0
+
| 3
−
| Bit field. 0: Initial spawn, 1: Respawn after death, '''2: Request statistics'''
+
| Status
−
|-
+
|
−
| Total Size:
+
|-
−
| colspan="5" | 2 bytes
+
| 4
−
|}
+
| Feedback
 +
|  
 +
|-
 +
| 5
 +
| Community
 +
|  
 +
|-
 +
| 6
 +
| Website
 +
|  
 +
|-
 +
| 7
 +
| Forums
 +
|  
 +
|-
 +
| 8
 +
| News
 +
|  
 +
|-
 +
| 9
 +
| Announcements
 +
|  
 +
|-
 +
|}
  
−
== Removed Packets ==
+
=== Serverbound ===
−
None
 
  
−
== Plugin Channels ==
+
No changes so far.
  
−
=== MC|RPack ===
+
[[Category:Minecraft Modern]]
−
{| class="wikitable"
 
−
! Field Name !! Field Type !! Example !! Notes
 
−
|-
 
−
| Resource pack URL || UTF8 string || http://example.com/pack.zip ||
 
−
|}
 

Latest revision as of 10:40, 8 June 2024

This page documents the changes from the last stable Minecraft release (currently 1.20.6, protocol 766) to the current pre-release (currently 1.21-pre2, protocol Snapshot 200). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes documented so far.

Packets

ID Packet name Documentation
Configuration clientbound
0x0F Clientbound Report Details (configuration) Pre
0x10 Clientbound Server Links (configuration) Pre
Play clientbound
0x7A Clientbound Report Details (play) Pre
0x7B Clientbound Server Links (play) Pre

Handshake

No changes so far.

Status

No changes so far.

Login

No changes so far.

Configuration

Clientbound

Clientbound Report Details (configuration)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x0F Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (configuration)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x10 Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.


ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

Play

Clientbound

Clientbound Report Details (play)

Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.

Packet ID State Bound To Field Name Field Type Notes
0x7A Configuration Client Details Count VarInt (32) The number of details in the following array.
Details Title Array String (128)
Description String (4096)

Clientbound Server Links (play)

This packet contains a list of links that the Notchian client will display in the menu available from the pause menu. Link labels can be built-in or custom (i.e., any text).

Packet ID State Bound To Field Name Field Type Notes
0x7B Configuration Client Links Count VarInt The number of links in the following array.
Links Is built-in Array Boolean Determines if the following label is built-in (from enum) or custom (text component).
Label VarInt Enum / Text Component See below.
URL String Valid URL.
ID Name Notes
0 Bug Report Displayed on connection error screen; included as a comment in the disconnection report.
1 Community Guidelines
2 Support
3 Status
4 Feedback
5 Community
6 Website
7 Forums
8 News
9 Announcements

Serverbound

No changes so far.

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