Difference between revisions of "Pre-release protocol"

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(For the player block placement packet the current held item is replaced by the hand)
(Updated to 1.21-pre2)
 
Line 1: Line 1:
−
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.8.8, protocol 47]]) to the current pre-release (currently [[Protocol version numbers|15w31a, protocol 49]]). 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.
  
 
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.
 
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 history ==
+
== Contents ==
  
−
None so far.
+
<div style="float:right;">__TOC__</div>
  
−
== New/modified data types ==
+
=== Data types ===
  
−
None so far.
+
No changes documented so far.
  
−
== Handshaking ==
+
=== Packets ===
−
 
 
−
=== Clientbound ===
 
−
 
 
−
No changes so far.
 
−
 
 
−
=== Serverbound ===
 
−
 
 
−
==== Handshake ====
 
−
 
 
−
This causes the server to switch into the target state.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
−
  ! Packet ID
+
  ! ID
−
  ! State
+
  ! Packet name
−
! Bound To
+
  !colspan="2"| Documentation
−
! Field Name
 
−
! Field Type
 
−
  ! Notes
 
 
  |-
 
  |-
−
  |rowspan="4"| 0x00
+
  !colspan="4"| Configuration clientbound
−
  |rowspan="4"| Handshaking
+
  {{PacketList|0x0F|Clientbound Report Details (configuration)|rel=added}}
−
|rowspan="4"| Server
+
  {{PacketList|0x10|Clientbound Server Links (configuration)|rel=added}}
−
  | Protocol Version
 
−
| VarInt
 
−
| See [[protocol version numbers]] (currently {{Change|47|49}})
 
 
  |-
 
  |-
−
  | Server Address
+
  !colspan="4"| Play clientbound
−
  | String
+
  {{PacketList|0x7A|Clientbound Report Details (play)|rel=added}}
−
| hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
+
  {{PacketList|0x7B|Clientbound Server Links (play)|rel=added}}
−
  |-
 
−
| Server Port
 
−
| Unsigned Short
 
−
| default is 25565
 
 
  |-
 
  |-
−
| Next State
+
|}
−
| VarInt
+
 
−
| 1 for [[#Status|status]], 2 for [[#Login|login]]
+
== Handshake ==
−
|}
 
  
−
== Play ==
+
No changes so far.
  
−
=== Clientbound ===
+
== Status ==
  
 
No changes so far.
 
No changes so far.
  
−
=== Serverbound ===
+
== Login ==
 +
 
 +
No changes so far.
  
−
==== Use Entity ====
+
== Configuration ==
  
−
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
+
=== Clientbound ===
  
−
A Notchian server only accepts this packet if the entity being attacked/used is visible without obstruction and within a 4-unit radius of the player's position.
+
==== Clientbound Report Details (configuration) ====
  
−
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
+
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
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="6"| 0x02
+
  | rowspan="3"| 0x0F
−
  |rowspan="6"| Play
+
  | rowspan="3"| Configuration
−
  |rowspan="6"| Server
+
  | rowspan="3"| Client
−
  | Target
+
  | colspan="2"| Details Count
−
  | VarInt
+
  | colspan="2"| {{Type|VarInt}} (32)
−
  |  
+
  | The number of details in the following array.
 
  |-
 
  |-
−
  | Type
+
  | rowspan="2"| Details
−
  | VarInt
+
| Title
−
  | 0: interact, 1: attack, 2: interact at
+
| rowspan="2"| {{Type|Array}}
 +
  | {{Type|String}} (128)
 +
  |
 
  |-
 
  |-
−
  | Target X
+
  | Description
−
  | Optional Float
+
  | {{Type|String}} (4096)
−
| Only if Type is interact at
+
  |
−
|-
+
|}
−
| Target Y
 
−
| Optional Float
 
−
| Only if Type is interact at
 
−
|-
 
−
  | Target Z
 
−
| Optional Float
 
−
| Only if Type is interact at
 
−
|-
 
−
| Hand
 
−
| Optional Byte
 
−
| Only if Type is interact or interact at; 0: Main Hand, 1: Off Hand
 
−
|}
 
  
−
==== Player Digging ====
+
==== Clientbound Server Links (configuration) ====
  
−
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius of the player's position.
+
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
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="3"| 0x07
+
  | rowspan="4"| 0x10
−
  |rowspan="3"| Play
+
  | rowspan="4"| Configuration
−
  |rowspan="3"| Server
+
  | rowspan="4"| Client
−
  | Status
+
  | colspan="2"| Links Count
−
| Byte
+
  | colspan="2"| {{Type|VarInt}}
−
| The action the player is taking against the block (see below)
+
  | The number of links in the following array.
−
|-
 
−
| Location
 
−
| Position
 
−
| Block position
 
−
  |-
 
−
| Face
 
−
| Byte
 
−
| The face being hit (see below)
 
−
|}
 
−
 
 
−
Status can (currently) be one of six values:
 
−
 
 
−
{| class="wikitable"
 
−
! Meaning
 
−
! Value
 
−
|-
 
−
| Started digging
 
−
  | <code>0</code>
 
 
  |-
 
  |-
−
  | Cancelled digging
+
  | rowspan="3"| Links
−
  | <code>1</code>
+
| Is built-in
 +
| rowspan="3"| {{Type|Array}}
 +
| {{Type|Boolean}}
 +
  | Determines if the following label is built-in (from enum) or custom (text component).
 
  |-
 
  |-
−
  | Finished digging
+
  | Label
−
  | <code>2</code>
+
  | {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
 +
| See below.
 
  |-
 
  |-
−
  | Drop item stack
+
  | URL
−
  | <code>3</code>
+
  | {{Type|String}}
−
|-
+
  | Valid URL.
−
| Drop item
+
|}
−
| <code>4</code>
 
−
|-
 
−
| Shoot arrow / finish eating
 
−
| <code>5</code>
 
−
|-
 
−
| Swap item in Hand
 
−
  | <code>6</code>
 
−
|}
 
  
−
Notchian clients send a 0 (started digging) when they start digging and a 2 (finished digging) once they think they are finished. If digging is aborted, the client simply send a 1 (cancel digging).
 
  
−
Status code 4 (drop item) is a special case. In-game, when you use the Drop Item command (keypress 'q'), a dig packet with a status of 4, and all other values set to 0, is sent from client to server. Status code 3 is similar, but drops the entire stack.
+
{| class="wikitable" {{added}}
−
 
+
! ID
−
Status code 5 (shoot arrow / finish eating) is also a special case. The x, y and z fields are all set to 0 like above, with the exception of the face field, which is set to 255.
+
! Name
−
 
+
! Notes
−
Status code 6 is another special case. Used to swap or assign an item to the second hand. The rest of the fields (x, y, z and face) are all set to 0.
 
−
 
 
−
The face can be one of six values, representing the face being hit:
 
−
 
 
−
{| class="wikitable"
 
 
  |-
 
  |-
−
! Value
 
 
  | 0
 
  | 0
 +
| Bug Report
 +
| Displayed on connection error screen; included as a comment in the disconnection report.
 +
|-
 
  | 1
 
  | 1
 +
| Community Guidelines
 +
|
 +
|-
 
  | 2
 
  | 2
 +
| Support
 +
|
 +
|-
 
  | 3
 
  | 3
 +
| Status
 +
|
 +
|-
 
  | 4
 
  | 4
 +
| Feedback
 +
|
 +
|-
 
  | 5
 
  | 5
 +
| Community
 +
|
 
  |-
 
  |-
−
! Offset
+
  | 6
−
| -Y
+
  | Website
−
  | +Y
+
  |  
−
  | -Z
 
−
  | +Z
 
−
| -X
 
−
| +X
 
−
|}
 
−
 
 
−
==== Player Block Placement ====
 
−
 
 
−
{| class="wikitable"
 
 
  |-
 
  |-
−
  ! Packet ID
+
  | 7
−
  ! State
+
  | Forums
−
  ! Bound To
+
  |
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
 
  |-
 
  |-
−
  |rowspan="6"| 0x08
+
  | 8
−
|rowspan="6"| Play
+
  | News
−
|rowspan="6"| Server
 
−
| Location
 
−
| Position
 
−
| Block position
 
−
|-
 
−
| Face
 
−
| Byte
 
−
| The face on which the block is placed (see above)
 
−
|-
 
−
| {{Change|Held Item|Hand}}
 
−
| {{Change|[[Slot Data|Slot]]|Byte}}
 
−
| The hand from which the block is placed; 0: Main Hand, 1: Off Hand
 
−
|-
 
−
| Cursor Position X
 
−
| Byte
 
−
| The position of the crosshair on the block
 
−
|-
 
−
| Cursor Position Y
 
−
  | Byte
 
 
  |  
 
  |  
 
  |-
 
  |-
−
  | Cursor Position Z
+
  | 9
−
  | Byte
+
  | Announcements
 
  |  
 
  |  
−
|}
 
−
 
−
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
 
−
 
−
This packet has a special case where X, Y, Z, and Direction are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, pulling back bows, using buckets, etc.
 
−
 
−
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up). This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action — based on current position/orientation and with a distance check — it appears that buckets can only be used within a radius of 6 units.
 
−
 
−
==== Held Item Change ====
 
−
 
−
Sent when the player changes the slot selection
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
 
  |-
 
  |-
−
|rowspan="1"| {{Change|0x09|0x0A}}
 
−
|rowspan="1"| Play
 
−
|rowspan="1"| Server
 
−
| Slot
 
−
| Short
 
−
| The slot which the player has selected (0–8)
 
 
  |}
 
  |}
  
 +
=== Serverbound ===
  
−
==== Animation ====
+
No changes so far.
  
−
Sent when the player's arm swings
+
== Play ==
−
 
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="1"| {{Change|0x0A|0x0B}}
 
−
|rowspan="1"| Play
 
−
|rowspan="1"| Server
 
−
| Hand
 
−
| Byte
 
−
| Hand used for the animation.
 
−
|}
 
  
 +
=== Clientbound ===
  
−
==== Entity Action ====
+
==== Clientbound Report Details (play) ====
  
−
Sent at least when crouching, leaving a bed, or sprinting. To send action animation to client use 0x28. The client will send this with Action ID = 3 when “Leave Bed” is clicked.
+
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
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="3"| {{Change|0x0B|0x0C}}
+
  | rowspan="3"| 0x7A
−
  |rowspan="3"| Play
+
  | rowspan="3"| Configuration
−
  |rowspan="3"| Server
+
  | rowspan="3"| Client
−
  | Entity ID
+
  | colspan="2"| Details Count
−
| VarInt
+
  | colspan="2"| {{Type|VarInt}} (32)
−
  | Player ID
+
  | The number of details in the following array.
−
|-
 
−
| Action ID
 
−
| VarInt
 
−
  | The ID of the action, see below
 
−
|-
 
−
| Jump Boost
 
−
| VarInt
 
−
| Horse jump boost. Ranged from 0 -> 100.
 
−
|}
 
−
 
 
−
Action ID can be one of the following values:
 
−
 
 
−
{| class="wikitable"
 
−
! ID
 
−
! Action
 
−
|-
 
−
| 0
 
−
| Crouch
 
−
|-
 
−
| 1
 
−
| Uncrouch
 
−
|-
 
−
| 2
 
−
| Leave bed
 
−
|-
 
−
| 3
 
−
| Start sprinting
 
−
|-
 
−
| 4
 
−
| Stop sprinting
 
 
  |-
 
  |-
−
  | 5
+
  | rowspan="2"| Details
−
  | Jump with horse
+
| Title
 +
| rowspan="2"| {{Type|Array}}
 +
| {{Type|String}} (128)
 +
  |
 
  |-
 
  |-
−
  | <Strike>6</Strike>
+
  | Description
−
  | <Strike>Open inventory</Strike>
+
  | {{Type|String}} (4096)
−
  |}
+
  |
 +
|}
  
 +
==== Clientbound Server Links (play) ====
  
−
==== Steer Vehicle ====
+
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
 
  ! State
 
  ! Bound To
 
  ! Bound To
−
  ! Field Name
+
  ! colspan="2"| Field Name
−
  ! Field Type
+
  ! colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
  |rowspan="3"| {{Change|0x0C|0x0D}}
+
  | rowspan="4"| 0x7B
−
  |rowspan="3"| Play
+
  | rowspan="4"| Configuration
−
  |rowspan="3"| Server
+
  | rowspan="4"| Client
−
  | Sideways
+
  | colspan="2"| Links Count
−
  | Float
+
  | colspan="2"| {{Type|VarInt}}
−
  | Positive to the left of the player
+
  | The number of links in the following array.
 
  |-
 
  |-
−
  | Forward
+
  | rowspan="3"| Links
−
  | Float
+
| Is built-in
−
  | Positive forward
+
| rowspan="3"| {{Type|Array}}
 +
  | {{Type|Boolean}}
 +
  | Determines if the following label is built-in (from enum) or custom (text component).
 
  |-
 
  |-
−
  | Flags
+
  | Label
−
  | Unsigned Byte
+
  | {{Type|VarInt}} {{Type|Enum}} / {{Type|Text Component}}
−
| Bit mask. 0x1: jump, 0x2: unmount
+
  | See below.
−
|}
 
−
 
 
−
==== Close Window ====
 
−
 
 
−
This packet is sent by the client when closing a window.
 
−
 
 
−
Note, Notchian clients send a close window message with Window ID 0 to close their inventory even though there is never an Open Window message for inventory.
 
−
 
 
−
{| class="wikitable"
 
−
  ! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
 
  |-
 
  |-
−
  | {{Change|0x0D|0x0E}}
+
| URL
−
  |rowspan="1"| Play
+
  | {{Type|String}}
−
|rowspan="1"| Server
+
  | Valid URL.
−
| Window ID
+
|}
−
| Unsigned Byte
 
−
| This is the ID of the window that was closed. 0 for inventory.
 
−
|}
 
  
−
==== Click Window ====
+
{| class="wikitable" {{added}}
−
 
+
  ! ID
−
This packet is sent by the player when it clicks on a slot in a window.
+
  ! Name
−
 
 
−
{| class="wikitable"
 
−
  ! Packet ID
 
−
  ! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
−
|rowspan="6"| {{Change|0x0E|0x0F}}
 
−
|rowspan="6"| Play
 
−
|rowspan="6"| Server
 
−
| Window ID
 
−
| Unsigned Byte
 
−
| The ID of the window which was clicked. 0 for player inventory.
 
−
|-
 
−
| Slot
 
−
| Short
 
−
| The clicked slot Nr., see below
 
−
|-
 
−
| Button
 
−
| Byte
 
−
| The button used in the click, see below
 
−
|-
 
−
| Action Number
 
−
| Short
 
−
| A unique number for the action, implemented by Notchian as a counter, starting at 1. Used by the server to send back a [[#Confirm Transaction|Confirm Transaction]].
 
−
|-
 
−
| Mode
 
−
| Byte
 
−
| Inventory operation mode, see below
 
−
|-
 
−
| Clicked item
 
−
| [[Slot Data|Slot]]
 
−
| The clicked slot. Has to be empty (item ID = -1) for drop mode.
 
−
|}
 
−
 
−
See [[Inventory#Windows|inventory windows]] for further information about how slots are indexed.
 
−
 
−
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 
−
 
−
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
 
−
 
−
{| class="wikitable"
 
−
! Mode
 
−
! Button
 
−
! Slot
 
−
! Trigger
 
−
|-
 
−
!rowspan="2"| 0
 
 
  | 0
 
  | 0
−
  | Normal
+
  | Bug Report
−
  | Left mouse click
+
  | Displayed on connection error screen; included as a comment in the disconnection report.
 
  |-
 
  |-
 
  | 1
 
  | 1
−
  | Normal
+
  | Community Guidelines
−
  | Right mouse click
+
  |  
−
|-
 
−
!rowspan="2"| 1
 
−
| 0
 
−
| Normal
 
−
| Shift + left mouse click
 
−
|-
 
−
| 1
 
−
| Normal
 
−
| Shift + right mouse click ''(identical behavior)''
 
−
|-
 
−
!rowspan="5"| 2
 
−
| 0
 
−
| Normal
 
−
| Number key 1
 
−
|-
 
−
| 1
 
−
| Normal
 
−
| Number key 2
 
 
  |-
 
  |-
 
  | 2
 
  | 2
−
  | Normal
+
  | Support
−
  | Number key 3
+
  |  
 
  |-
 
  |-
−
  | ⋮
+
  | 3
−
| ⋮
+
  | Status
−
| ⋮
+
  |  
−
|-
 
−
| 8
 
−
| Normal
 
−
| Number key 9
 
−
|-
 
−
!rowspan="1"| 3
 
−
  | 2
 
−
| Normal
 
−
| Middle click
 
−
|-
 
−
!rowspan="4"| 4
 
−
| 0
 
−
| Normal*
 
−
| Drop key (Q) (* Clicked item is different, see above)
 
−
|-
 
−
| 1
 
−
| Normal*
 
−
| Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
 
−
|-
 
−
| 0
 
−
| -999
 
−
| Left click outside inventory holding nothing ''(no-op)''
 
−
|-
 
−
| 1
 
−
| -999
 
−
| Right click outside inventory holding nothing ''(no-op)''
 
−
|-
 
−
!rowspan="6"| 5
 
−
| 0
 
−
| -999
 
−
  | Starting left mouse drag ''(or middle mouse)''
 
 
  |-
 
  |-
 
  | 4
 
  | 4
−
  | -999
+
  | Feedback
−
  | Starting right mouse drag
+
  |  
−
|-
 
−
| 1
 
−
| Normal
 
−
| Add slot for left-mouse drag
 
 
  |-
 
  |-
 
  | 5
 
  | 5
−
  | Normal
+
  | Community
−
  | Add slot for right-mouse drag
+
  |  
−
|-
 
−
| 2
 
−
| -999
 
−
| Ending left mouse drag
 
 
  |-
 
  |-
 
  | 6
 
  | 6
−
  | -999
+
  | Website
−
  | Ending right mouse drag
+
  |  
 
  |-
 
  |-
−
! 6
+
  | 7
−
| 0
+
  | Forums
−
  | Normal
+
  |  
−
  | Double click
 
−
  |}
 
−
 
 
−
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
 
−
 
 
−
# packet with mode 5, slot -999, button (0 for left | 4 for right);
 
−
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
−
# packet with mode 5, slot -999, button (2 | 6);
 
−
 
 
−
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
−
 
 
−
The server will send back a [[#Confirm Transaction_2|Confirm Transaction]] packet. If the click was not accepted, the client must reflect that packet before sending more [[#Click Window|Click Window]] packets, otherwise the server will reject them silently. The Notchian server also sends a [[#Window Items|Window Items]] packet for the open window and [[#Set Slot|Set Slot]] packets for the clicked and cursor slot, but only when the click was not accepted, probably to resynchronize client and server.
 
−
 
 
−
 
 
−
==== Creative Inventory Action ====
 
−
 
 
−
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
 
−
 
 
−
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
 
−
 
 
−
This action can be described as "set inventory slot". Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2x2 crafting menu, even though they aren't visible in the vanilla client).
 
−
 
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
 
  |-
 
  |-
−
  |rowspan="2"| {{Change|0x10|0x11}}
+
  | 8
−
|rowspan="2"| Play
+
  | News
−
|rowspan="2"| Server
 
−
  | Slot
 
−
| Short
 
−
| Inventory slot
 
−
|-
 
−
| Clicked Item
 
−
| [[Slot Data|Slot]]
 
 
  |  
 
  |  
−
|}
 
−
 
−
==== Enchant Item ====
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="2"| {{Change|0x11|0x12}}
 
−
|rowspan="2"| Play
 
−
|rowspan="2"| Server
 
−
| Window ID
 
−
| Byte
 
−
| The ID of the enchantment table window sent by [[#Open Window|Open Window]]
 
 
  |-
 
  |-
−
  | Enchantment
+
  | 9
−
  | Byte
+
  | Announcements
−
| The position of the enchantment on the enchantment table window, starting with 0 as the topmost one
 
−
|}
 
−
 
 
−
==== Tab-Complete ====
 
−
 
 
−
Sent when the user presses ''tab'' while writing text.
 
−
 
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="3"| {{Change|0x14|0x15}}
 
−
|rowspan="3"| Play
 
−
|rowspan="3"| Server
 
−
| Text
 
−
| String
 
−
| All text behind the cursor
 
−
|-
 
−
| Has Position
 
−
| Boolean
 
 
  |  
 
  |  
 
  |-
 
  |-
−
| Looked At Block
 
−
| Optional Position
 
−
| The position of the block being looked at. Only sent if Has Position is true
 
 
  |}
 
  |}
−
 
−
==== Client Settings ====
 
−
 
−
Sent when the player connects, or when settings are changed.
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="6"| {{Change|0x15|0x16}}
 
−
|rowspan="6"| Play
 
−
|rowspan="6"| Server
 
−
| Locale
 
−
| String
 
−
| e.g. en_GB
 
−
|-
 
−
| View Distance
 
−
| Byte
 
−
| Client-side render distance, in chunks
 
−
|-
 
−
| Chat Mode
 
−
| Byte
 
−
| 0: enabled, 1: commands only, 2: hidden
 
−
|-
 
−
| Chat Colors
 
−
| Boolean
 
−
| “Colors” multiplayer setting
 
−
|-
 
−
| Displayed Skin Parts
 
−
| Unsigned Byte
 
−
| Skin parts, see note below
 
−
|-
 
−
| Main Hand
 
−
| Byte
 
−
| 0: Left, 1: Right
 
−
|}
 
−
 
−
''Displayed Skin Parts'' flags:
 
−
 
−
* Bit 0 (0x01): Cape enabled
 
−
* Bit 1 (0x02): Jacket enabled
 
−
* Bit 2 (0x04): Left Sleeve enabled
 
−
* Bit 3 (0x08): Right Sleeve enabled
 
−
* Bit 4 (0x10): Left Pants Leg enabled
 
−
* Bit 5 (0x20): Right Pants Leg enabled
 
−
* Bit 6 (0x40): Hat enabled
 
−
 
−
The most significant bit (bit 7, 0x80) appears to be unused.
 
−
 
−
==== Client Status ====
 
−
 
−
Sent when the client is ready to complete login and when the client is ready to respawn after death.
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="1"| {{Change|0x16|0x17}}
 
−
|rowspan="1"| Play
 
−
|rowspan="1"| Server
 
−
| Action ID
 
−
| VarInt
 
−
| See below
 
−
|}
 
−
 
−
''Action ID'' values:
 
−
 
−
{| class="wikitable"
 
−
|-
 
−
! Action ID
 
−
! Action
 
−
|-
 
−
| 0
 
−
| Perform respawn
 
−
|-
 
−
| 1
 
−
| Request stats
 
−
|-
 
−
| 2
 
−
| {{Change|''Taking Inventory'' achievement|Open Inventory}}
 
−
|}
 
−
 
−
==== Plugin Message ====
 
−
 
−
Mods and plugins can use this to send their data. Minecraft itself uses a number of [[plugin channel]]s. These internal channels are prefixed with <code>MC|</code>.
 
−
 
−
More documentation on this: [http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/ http://dinnerbone.com/blog/2012/01/13/minecraft-plugin-channels-messaging/]
 
−
 
−
Note that the data length is known from the packet length, so there is no need for a length member being sent.
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="2"| {{Change|0x17|0x18}}
 
−
|rowspan="2"| Play
 
−
|rowspan="2"| Server
 
−
| Channel
 
−
| String
 
−
| Name of the [[plugin channel]] used to send the data
 
−
|-
 
−
| Data
 
−
| Byte Array
 
−
| Any data, depending on the channel. <code><nowiki>MC|</nowiki></code> channels are documented [[plugin channel|here]].
 
−
|}
 
−
 
−
==== Resource Pack Status ====
 
−
 
−
{| class="wikitable"
 
−
! Packet ID
 
−
! State
 
−
! Bound To
 
−
! Field Name
 
−
! Field Type
 
−
! Notes
 
−
|-
 
−
|rowspan="2"| {{Change|0x19|0x1A}}
 
−
|rowspan="2"| Play
 
−
|rowspan="2"| Server
 
−
| Hash
 
−
| String
 
−
| The hash sent in the [[#Resource Pack Send|Resource Pack Send]] packet.
 
−
|-
 
−
| Result
 
−
| VarInt
 
−
| 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
 
−
|}
 
−
 
−
== Status ==
 
−
 
−
=== Clientbound ===
 
−
 
−
No changes so far.
 
  
 
=== Serverbound ===
 
=== Serverbound ===
Line 762: Line 279:
 
No changes so far.
 
No changes so far.
  
−
== Login ==
+
[[Category:Minecraft Modern]]
−
 
 
−
=== Clientbound ===
 
−
 
 
−
No changes so far.
 
−
 
 
−
=== Serverbound ===
 
−
 
 
−
No changes so far.
 

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.

Retrieved from "https://wiki.vg/index.php?title=Pre-release_protocol&oldid=19307"