Difference between revisions of "Pre-release protocol"

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(Updated to 1.21-pre2)
 
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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.5, protocol 60) to the current pre-release, 13w17a (protocol 64). 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.
+
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.
  
−
== Protocol Version ==
+
== Contents ==
  
−
As of 13w17a the protocol version is 64.
+
<div style="float:right;">__TOC__</div>
  
−
== New Packets ==
+
=== Data types ===
  
−
{{anchor|0xC8}}
+
No changes documented so far.
−
=== Steer Vehicle (0x1B) ===
 
−
''Client to Server''
 
  
−
Sent by client to steer the horse, minecart and boats.
+
=== Packets ===
−
Horses listen to all directions, boats and minecarts only listen to the positive forward value in combination with the direction the player is looking in.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
|-
+
! ID
−
| Packet ID
+
! Packet name
−
| Field Name
+
!colspan="2"| Documentation
−
| Field Type
+
|-
−
| Example
+
!colspan="4"| Configuration clientbound
−
| Notes
+
{{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
−
|-
+
{{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
−
| rowspan="4" | 0x1B
+
|-
−
| Sideways
+
!colspan="4"| Play clientbound
−
| float
+
{{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
−
| 0.98
+
{{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
−
| Positive to the left of the player
+
|-
−
|-
 
−
| Forward
 
−
| float
 
−
| -0.98
 
−
| Positive forward
 
−
|-
 
−
| Jump
 
−
| bool
 
−
| true
 
−
|  
 
−
|-
 
−
| Unmount
 
−
| bool
 
−
| false
 
−
| True when leaving the vehicle
 
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 11 bytes
 
 
|}
 
|}
  
−
== Changed Packets ==
+
== Handshake ==
  
−
{{anchor|0x08}}
+
No changes so far.
−
=== Update Health (0x08) ===
 
−
''Server to Client''
 
  
−
Sent by the server to update/set the health of the player it is sent to. Added in protocol version 5.
+
== Status ==
  
−
Food saturation acts as a food "overcharge". Food values will not decrease while the saturation is over zero. Players logging in automatically get a saturation of 5.0. Eating food increases the saturation as well as the food bar.
+
No changes so far.
  
−
{| class="wikitable"
+
== Login ==
−
|-
+
 
−
| Packet ID
+
No changes so far.
−
| Field Name
+
 
−
| Field Type
+
== Configuration ==
−
| Example
+
 
−
| Notes
+
=== Clientbound ===
−
|-
+
 
−
| rowspan="3" | 0x08
+
==== Clientbound Report Details (configuration) ====
−
| Health
+
 
−
| '''float'''
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
−
| '''20.0'''
+
 
−
| 0 or less = dead, 20 = full HP
+
{| class="wikitable" {{added}}
−
|-
+
! Packet ID
−
| Food
+
! State
−
| short
+
! Bound To
−
| 20
+
! colspan="2"| Field Name
−
| 0 - 20
+
! colspan="2"| Field Type
−
|-
+
! Notes
−
| Food Saturation
+
|-
−
| float
+
| rowspan="3"| 0x0F
−
| 5.0
+
| rowspan="3"| Configuration
−
| Seems to vary from 0.0 to 5.0 in integer increments
+
| rowspan="3"| Client
−
|-
+
| colspan="2"| Details Count
−
| Total Size:
+
| colspan="2"| {{Type|VarInt}} (32)
−
| colspan="4" | 11 bytes
+
| The number of details in the following array.
 +
|-
 +
| rowspan="2"| Details
 +
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
|
 +
|-
 +
| Description
 +
| {{Type|String}} (4096)
 +
|
 
|}
 
|}
  
−
{{anchor|0x13}}
+
==== Clientbound Server Links (configuration) ====
−
=== Entity Action (0x13) ===
 
−
''Client to Server''
 
  
−
Sent at least when crouching, leaving a bed, or sprinting.
+
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).
−
To send action animation to client use 0x28.
 
−
The client will send this with Action ID = 3 when "Leave Bed" is clicked.
 
  
−
{| 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="3" | 0x13
+
| rowspan="4"| 0x10
−
| EID
+
| rowspan="4"| Configuration
−
| int
+
| rowspan="4"| Client
−
| <code>55534</code>
+
| colspan="2"| Links Count
−
| Player ID
+
| colspan="2"| {{Type|VarInt}}
−
|-
+
| The number of links in the following array.
−
| Action ID
+
|-
−
| byte
+
| rowspan="3"| Links
−
| <code>1</code>
+
| Is built-in
−
| The ID of the action, see below.
+
| rowspan="3"| {{Type|Array}}
−
|-
+
| {{Type|Boolean}}
−
| '''Unknown'''
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| int
+
|-
−
| <code>0</code>
+
| Label
−
| Something to do with horses. Ranged from 0 -> 90
+
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
|-
+
| See below.
−
| Total Size:
+
|-
−
| colspan="4" | 10 bytes
+
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 
|}
 
|}
  
−
Action ID can be one of the following values:
 
  
−
{| class="wikitable"
+
{| class="wikitable" {{added}}
−
|-
+
! ID
−
! ID
+
! Name
−
! Action
+
! Notes
−
|-
+
|-
−
| 1
+
| 0
−
| Crouch
+
| Bug Report
−
|-
+
| Displayed on connection error screen; included as a comment in the disconnection report.
−
| 2
+
|-
−
| Uncrouch
+
| 1
−
|-
+
| Community Guidelines
−
| 3
+
|  
−
| Leave bed
+
|-
−
|-
+
| 2
−
| 4
+
| Support
−
| Start sprinting
+
|
−
|-
+
|-
−
| 5
+
| 3
−
| Stop sprinting
+
| Status
−
|}
+
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|  
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
 +
 
 +
=== Serverbound ===
  
−
{{anchor|0x27}}
+
No changes so far.
−
=== Attach Entity (0x27) ===
 
−
''Server to Client''
 
  
−
This packet is sent when a player has been attached to an entity (e.g. Minecart)
+
== Play ==
  
−
{| class="wikitable"
+
=== Clientbound ===
−
|-
 
−
| Packet ID
 
−
| Field Name
 
−
| Field Type
 
−
| Example
 
−
| Notes
 
−
|-
 
−
| rowspan="3" | 0x27
 
−
| Entity ID
 
−
| int
 
−
| <code>1298</code>
 
−
| The player entity ID being attached
 
−
|-
 
−
| Vehicle ID
 
−
| int
 
−
| <code>1805</code>
 
−
| The vehicle entity ID attached to (-1 for unattaching)
 
−
|-
 
−
| '''Leash'''
 
−
| boolean
 
−
| <code>false</code>
 
−
| If set to true, leashes the entity to the vehicle
 
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 10 bytes
 
−
|}
 
  
−
{{anchor|0xCA}}
+
==== Clientbound Report Details (play) ====
−
=== Player Abilities (0xCA) ===
 
−
''Two-Way''
 
  
−
The latter 2 bytes are used to indicate the walking and flying speeds respectively, while the first byte is used to determine the value of 4 booleans.
+
Contains a list of key-value text entries that are included in any crash or disconnection report generated during connection to the server.
−
 
−
The flags are whether damage is disabled (god mode, 8, bit 3), whether the player can fly (4, bit 2), whether the player is flying (2, bit 1), and whether the player is in creative mode (1, bit 0).
 
−
 
−
To get the values of these booleans, simply AND (&) the byte with 1,2,4 and 8 respectively, to get the 0 or 1 bitwise value. To set them OR (|) them with their repspective masks.
 
−
The vanilla client sends this packet when the player starts/stops flying with the second parameter changed accordingly. All other parameters are ignored by the vanilla 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="3" | 0xCA
+
| rowspan="3"| 0x7A
−
| Flags
+
| rowspan="3"| Configuration
−
| byte
+
| rowspan="3"| Client
−
| 5
+
| colspan="2"| Details Count
−
|
+
| colspan="2"| {{Type|VarInt}} (32)
−
|-
+
| The number of details in the following array.
−
| Flying speed
+
|-
−
| '''float'''
+
| rowspan="2"| Details
−
| '''0.05'''
+
| Title
−
| previous integer value divided by 250
+
| rowspan="2"| {{Type|Array}}
−
|-
+
| {{Type|String}} (128)
−
| Walking speed
+
|
−
| '''float'''
+
|-
−
| '''0.1'''
+
| Description
−
| previous integer value divided by 250
+
| {{Type|String}} (4096)
−
|-
+
|
−
| Total Size:
 
−
| colspan="4" | 10 bytes
 
 
|}
 
|}
  
−
== Removed Packets ==
+
==== 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).
  
−
-None-
+
{| class="wikitable" {{added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! colspan="2"| Field Name
 +
! colspan="2"| Field Type
 +
! Notes
 +
|-
 +
| rowspan="4"| 0x7B
 +
| rowspan="4"| Configuration
 +
| rowspan="4"| Client
 +
| colspan="2"| Links Count
 +
| colspan="2"| {{Type|VarInt}}
 +
| The number of links in the following array.
 +
|-
 +
| rowspan="3"| Links
 +
| Is built-in
 +
| rowspan="3"| {{Type|Array}}
 +
| {{Type|Boolean}}
 +
| Determines if the following label is built-in (from enum) or custom (text component).
 +
|-
 +
| Label
 +
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
 +
| See below.
 +
|-
 +
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 +
|}
  
−
== Changed Data Types ==
+
{| 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
 +
|
 +
|-
 +
|}
  
−
-None-
+
=== Serverbound ===
  
−
== Protocol History ==
+
No changes so far.
  
−
-None-
+
[[Category:Minecraft Modern]]

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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