Difference between revisions of "Pre-release protocol"

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(Updated to 1.21-pre2)
 
Line 1: Line 1:
−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently 1.5.2, protocol 61) 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.
+
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 ==
  
−
1.6.1: Protocol version is now 73. Packet 0xFA is sent after packet 0xFE with additional data
+
<div style="float:right;">__TOC__</div>
  
−
1.6: Protocol version is now 72. Changed Open Window packet, added two inventory types
+
=== Data types ===
  
−
13w25a: Protocol version is now 71. Changed packet: [[Pre-release_protocol#0xC8|Increment Statistic (0xC8)]]
+
No changes documented so far.
  
−
13w24b: Protocol version is now 70
+
=== Packets ===
−
 
 
−
13w24a: Protocol version is now 69. Changed functionality: [[Pre-release_protocol#0x04|Time Update (0x04)]]
 
−
 
 
−
13w23b: Protocol version is now 68.
 
−
 
 
−
13w22a: Protocol version is now 67. New packet: [[Pre-release_protocol#0x2C|Entity Properties (0x2C)]]; Changed packets: [[Pre-release_protocol#0x03|Chat Message (0x03)]]
 
−
 
 
−
13w18b: Protocol version is now 65.
 
−
 
 
−
13w16b: Protocol version is now 63. New packet: [[Pre-release_protocol#0x1B|Steer Vehicle (0x1B)]]
 
−
 
 
−
13w16a: Protocol version is now 62. Changed packets: [[Pre-release_protocol#0x08|Update Health (0x08)]], [[Pre-release_protocol#0x17|Entity Action (0x17)]], [[Pre-release_protocol#0x27|Attach Entity (0x27)]], [[Pre-release_protocol#0xCA|Player Abilities (0xCA)]]
 
−
 
 
−
== New Packets ==
 
−
 
 
−
{{anchor|0x1B}}
 
−
=== Steer Vehicle (0x1B) ===
 
−
''Client to Server''
 
−
 
 
−
Sent by client to steer the horse, minecart and boats.
 
−
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
 
 
|}
 
|}
  
−
{{anchor|0x2C}}
+
== Handshake ==
−
=== Entity Properties (0x2C) ===
 
−
''Server to Client''
 
−
 
 
−
'''Note''': The server sends this packet to inform the user of its movement speed. Users move far too fast when this packet is not sent.
 
−
 
 
−
{| class="wikitable"
 
−
|-
 
−
| Packet ID
 
−
| Field Name
 
−
| Field Type
 
−
| Example
 
−
| Notes
 
−
|-
 
−
| rowspan="4" | 0x2C
 
−
| EntityID
 
−
| int
 
−
| 195
 
−
| ?
 
−
|-
 
−
| Properties Count
 
−
| int
 
−
| 3
 
−
| Number of string/data pairs that follow. The remaining fields here are repeated this number of times.
 
−
|-
 
−
| Key
 
−
| string16
 
−
| "generic.Maxhealth"
 
−
|
 
−
|-
 
−
| Value
 
−
| double
 
−
| 20.0
 
−
|
 
−
|-
 
−
| Total Size:
 
−
| colspan="4" | ? bytes
 
−
|}
 
−
 
 
−
Known values:
 
−
{| class="wikitable"
 
−
|-
 
−
| Key
 
−
| Default
 
−
| Min
 
−
| Max
 
−
| Label
 
−
|-
 
−
| generic.maxHealth
 
−
| 20.0
 
−
| 0.0
 
−
| Double.MaxValue
 
−
| Max Health
 
−
|-
 
−
| generic.followRange
 
−
| 32.0
 
−
| 0.0
 
−
| 2048.0
 
−
| Follow Range
 
−
|-
 
−
| generic.knockbackResistance
 
−
| 0.0
 
−
| 0.0
 
−
| 1.0
 
−
| Knockback Resistance
 
−
|-
 
−
| generic.movementSpeed
 
−
| 0.699999988079071
 
−
| 0.0
 
−
| Double.MaxValue
 
−
| Movement Speed
 
−
|-
 
−
| generic.attackDamage
 
−
| 2.0
 
−
| 0.0
 
−
| Double.MaxValue
 
−
|
 
−
|-
 
−
| horse.jumpStrength
 
−
| 0.7
 
−
| 0.0
 
−
| 2.0
 
−
| Jump Strength
 
−
|-
 
−
| zombie.spawnReinforcements
 
−
| 0.0
 
−
| 0.0
 
−
| 1.0
 
−
| Spawn Reinforcements Chance
 
−
|}
 
−
 
 
−
== Changed Packets ==
 
−
 
 
−
{{anchor|0x03}}
 
−
=== Chat Message (0x03) ===
 
−
 
 
−
''Client to Server''
 
−
 
 
−
Unchanged
 
−
 
 
−
''Server to Client''
 
−
 
 
−
The chat string must now be a valid JSON object:
 
−
 
 
−
    {"translate":"chat.type.announcement","using":["Server","hi"]}
 
−
    {"color":"gray","italic":true,"translate":"chat.type.admin","using":["Server",{"translate":"commands.save.success"}]}
 
−
    {"text":"§aOld style chat"}
 
−
[https://gist.github.com/Dinnerbone/5631634 Original Gist from Dinnerbone]
 
−
 
 
−
Where translate is one of the following:
 
  
−
    chat.type.admin: [%s: %s]
+
No changes so far.
−
    chat.type.announcement: [%s] %s
 
−
    chat.type.emote: * %s %s
 
−
    chat.type.text: <%s> %s
 
  
−
{{anchor|0x04}}
+
== Status ==
−
=== Time Update (0x04) ===
 
−
''Server to Client''
 
  
−
Time is based on ticks, where 20 ticks happen every second. There are 24000 ticks in a day, making Minecraft days exactly 20 minutes long.
+
No changes so far.
  
−
The time of day is based on the timestamp modulo 24000. 0 is sunrise, 6000 is noon, 12000 is sunset, and 18000 is midnight.
+
== Login ==
  
−
The default SMP server increments the time by <code>20</code> every second.
+
No changes so far.
  
−
{| class="wikitable"
+
== Configuration ==
−
|-
 
−
! | Packet ID
 
−
! | Field Name
 
−
! | Field Type
 
−
! | Example
 
−
! | Notes
 
−
|-
 
−
| rowspan="2" | 0x04
 
−
| Age of the world
 
−
| long
 
−
| 45464654
 
−
| In ticks; not changed by server commands
 
−
|-
 
−
| Time of Day
 
−
| long
 
−
| 21321
 
−
| The world (or region) time, in ticks. '''If negative the sun will stop moving at the Math.abs of the time.'''
 
−
|-
 
−
! | Total Size:
 
−
| colspan="4" | 17 Bytes
 
−
|}
 
  
−
{{anchor|0x08}}
+
=== Clientbound ===
−
=== 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.
+
==== Clientbound Report Details (configuration) ====
  
−
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.
+
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="3" | 0x08
+
| rowspan="3"| 0x0F
−
| Health
+
| rowspan="3"| Configuration
−
| '''float'''
+
| rowspan="3"| Client
−
| '''20.0'''
+
| colspan="2"| Details Count
−
| 0 or less = dead, 20 = full HP
+
| colspan="2"| {{Type|VarInt}} (32)
−
|-
+
| The number of details in the following array.
−
| Food
+
|-
−
| short
+
| rowspan="2"| Details
−
| 20
+
| Title
−
| 0 - 20
+
| rowspan="2"| {{Type|Array}}
−
|-
+
| {{Type|String}} (128)
−
| Food Saturation
+
|
−
| float
+
|-
−
| 5.0
+
| Description
−
| Seems to vary from 0.0 to 5.0 in integer increments
+
| {{Type|String}} (4096)
−
|-
+
|
−
| Total Size:
 
−
| colspan="4" | 11 bytes
 
 
|}
 
|}
  
−
{{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
 +
|
 +
|-
 +
|}
  
−
{{anchor|0x27}}
+
=== Serverbound ===
−
=== Attach Entity (0x27) ===
 
−
''Server to Client''
 
  
−
This packet is sent when a player has been attached to an entity (e.g. Minecart)
+
No changes so far.
  
−
{| class="wikitable"
+
== Play ==
−
|-
 
−
| 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
 
−
|}
 
  
−
=== Open Window (0x64) ===
+
=== Clientbound ===
−
''Server to Client''
 
  
−
This is sent to the client when it should open an inventory, such as a chest, workbench, or furnace. This message is not sent anywhere for clients opening their own inventory.
+
==== Clientbound Report Details (play) ====
  
−
{| class="wikitable"
+
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
 
−
| Field Name
 
−
| Field Type
 
−
| Example
 
−
| Notes
 
−
|-
 
−
| rowspan="5" | 0x64
 
−
| Window id
 
−
| byte
 
−
| 123
 
−
| A unique id number for the window to be displayed.  Notchian server implementation is a counter, starting at 1.
 
−
|-
 
−
| Inventory Type
 
−
| byte
 
−
| 2
 
−
| The window type to use for display.  Check below
 
−
|-
 
−
| Window title
 
−
| string
 
−
| <code>Chest</code>
 
−
| The title of the window.
 
−
|-
 
−
| Number of Slots
 
−
| byte
 
−
| 3
 
−
| Number of slots in the window (excluding the number of slots in the player inventory).
 
−
|-
 
−
| Use provided window title
 
−
| boolean
 
−
| 1
 
−
| If false, the client will look up a string like "window.minecart". If true, the client uses what the server provides.
 
−
|-
 
−
| Unknown
 
−
| int
 
−
| 0
 
−
| Only sent when window type is equal to 11
 
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 8 bytes + length of string
 
−
|}
 
  
−
See [[Inventory#Windows|inventory windows]] for further information.
+
{| class="wikitable" {{added}}
−
 
+
! Packet ID
−
{{anchor|0xC8}}
+
! State
−
=== Increment Statistic (0xC8) ===
+
! Bound To
−
''Server to Client''
+
! colspan="2"| Field Name
−
 
+
! colspan="2"| Field Type
−
{| class="wikitable"
+
! Notes
−
|-
+
|-
−
| Packet ID
+
| rowspan="3"| 0x7A
−
| Field Name
+
| rowspan="3"| Configuration
−
| Field Type
+
| rowspan="3"| Client
−
| Example
+
| colspan="2"| Details Count
−
| Notes
+
| colspan="2"| {{Type|VarInt}} (32)
−
|-
+
| The number of details in the following array.
−
| rowspan="2" | 0xC8
+
|-
−
| Statistic ID
+
| rowspan="2"| Details
−
| int
+
| Title
−
| 1003
+
| rowspan="2"| {{Type|Array}}
−
| The ID of the statistic. See [http://www.minecraftforum.net/viewtopic.php?f=1020&t=295360 List of statistics].
+
| {{Type|String}} (128)
−
|-
+
|
−
| Amount
+
|-
−
| '''int'''
+
| Description
−
| 1
+
| {{Type|String}} (4096)
−
| The amount to increment the statistic.
+
|
−
|-
 
−
| Total Size:
 
−
| colspan="4" | 9 bytes
 
 
|}
 
|}
  
−
{{anchor|0xCA}}
+
==== Clientbound Server Links (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.
+
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).
−
 
−
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="4"| 0x7B
−
| Flags
+
| rowspan="4"| Configuration
−
| byte
+
| rowspan="4"| Client
−
| 5
+
| colspan="2"| Links Count
−
|
+
| colspan="2"| {{Type|VarInt}}
−
|-
+
| The number of links in the following array.
−
| Flying speed*
+
|-
−
| '''float'''
+
| rowspan="3"| Links
−
| '''0.05'''
+
| Is built-in
−
| previous integer value divided by 250
+
| rowspan="3"| {{Type|Array}}
−
|-
+
| {{Type|Boolean}}
−
| Walking speed*
+
| Determines if the following label is built-in (from enum) or custom (text component).
−
| '''float'''
+
|-
−
| '''0.1'''
+
| Label
−
| previous integer value divided by 250
+
| {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
|-
+
| See below.
−
| Total Size:
+
|-
−
| colspan="4" | 10 bytes
+
| URL
 +
| {{Type|String}}
 +
| Valid URL.
 
|}
 
|}
  
−
The client ignores the walking speed and flying speed fields. Send an 0x2C packet as well.
+
{| class="wikitable" {{added}}
−
 
+
! ID
−
== Removed Packets ==
+
! Name
−
 
+
! Notes
−
-None-
+
|-
−
 
+
| 0
−
== Changed Data Types ==
+
| Bug Report
−
 
+
| Displayed on connection error screen; included as a comment in the disconnection report.
−
New inventory types:
+
|-
 +
| 1
 +
| Community Guidelines
 +
|
 +
|-
 +
| 2
 +
| Support
 +
|
 +
|-
 +
| 3
 +
| Status
 +
|
 +
|-
 +
| 4
 +
| Feedback
 +
|
 +
|-
 +
| 5
 +
| Community
 +
|
 +
|-
 +
| 6
 +
| Website
 +
|
 +
|-
 +
| 7
 +
| Forums
 +
|
 +
|-
 +
| 8
 +
| News
 +
|
 +
|-
 +
| 9
 +
| Announcements
 +
|
 +
|-
 +
|}
  
−
* 10: Dropper
+
=== Serverbound ===
−
* 11: Horses, donkeys
 
  
−
== 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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