Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.12.2, protocol 340]]) to the current pre-release (currently [[Protocol version numbers|1.12.2, protocol 340]]). 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|1.18.2, protocol 758]]) to the current pre-release (currently [[Protocol version numbers|22w16b, protocol {{Snapshot PVN|1073741905}}]]). 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.
Line 13: Line 13:
 
=== Packets ===
 
=== Packets ===
  
<!--
+
Packet ID shifts have not been included.
 +
 
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! ID
 
  ! ID
 
  ! Packet name
 
  ! Packet name
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x02|Spawn Living Entity|pre=removed}}
 +
{{PacketList|0x03|Spawn Painting|pre=removed}}
 +
{{PacketList|0x05|Sculk Vibration Signal|pre=removed}}
 +
{{PacketList|0x05|Acknowledge Block Changes|rel=added}}
 +
{{PacketList|0x08|Acknowledge Player Digging|pre=removed}}
 +
{{PacketList|0x5C|System Message|rel=added}}
 +
 +
|-
 +
!colspan="4"| Play serverbound
 
  |-
 
  |-
 
!colspan="4"| Handshaking serverbound
 
!colspan="4"| Handshaking serverbound
{{PacketList|0x00|Handshake}}
 
 
  |}
 
  |}
-->
 
  
 
== New/modified data types ==
 
== New/modified data types ==
 +
 +
No changes so far.
 +
 +
== Entity Metadata ==
 +
 +
=== Goat ===
 +
 +
{{Metadata inherit|Goat}}
 +
 +
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is Screaming Goat
 +
| false
 +
|- {{added}}
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has Left Horn
 +
| true
 +
|- {{added}}
 +
| {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has Right Horn
 +
| true
 +
|-
 +
|}
 +
 +
=== Painting ===
 +
 +
{{Metadata inherit|Painting}}
 +
 +
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|- {{added}}
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| PaintingVariant
 +
| 0
 +
|}
 +
 +
=== Player ===
 +
 +
{{Metadata inherit|Player}}
 +
 +
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| {{Metadata id|}}
 +
| Float
 +
|colspan="2"| Additional Hearts
 +
| 0.0
 +
|-
 +
| {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Score
 +
| 0
 +
|-
 +
|rowspan="10"| {{Metadata id|}}
 +
|rowspan="10"| Byte
 +
|colspan="2"| The Displayed Skin Parts bit mask that is sent in [[Protocol#Client Settings|Client Settings]]
 +
|rowspan="10"| 0
 +
|-
 +
! Bit mask !! Meaning
 +
|-
 +
| 0x01 || Cape enabled
 +
|-
 +
| 0x02 || Jacket enabled
 +
|-
 +
| 0x04 || Left sleeve enabled
 +
|-
 +
| 0x08 || Right sleeve enabled
 +
|-
 +
| 0x10 || Left pants leg enabled
 +
|-
 +
| 0x20 || Right pants leg enabled
 +
|-
 +
| 0x40 || Hat enabled
 +
|-
 +
| 0x80 || ''Unused''
 +
|-
 +
| {{Metadata id|}}
 +
| Byte
 +
|colspan="2"| Main hand (0 : Left, 1 : Right)
 +
| 1
 +
|-
 +
| {{Metadata id|}}
 +
| [[NBT]]
 +
|colspan="2"| Left shoulder entity data (for occupying parrot)
 +
| Empty
 +
|-
 +
| {{Metadata id|}}
 +
| [[NBT]]
 +
|colspan="2"| Right shoulder entity data (for occupying parrot)
 +
| Empty
 +
|- {{added}}
 +
| {{Metadata id|}}
 +
| Global Position
 +
|colspan="2"| Optional Last Death Location (used for respawn compass)
 +
| Empty
 +
|}
 +
 +
 +
 +
=== Entity ===
  
 
No changes so far.
 
No changes so far.
Line 30: Line 155:
 
== Block Actions ==
 
== Block Actions ==
  
No changes so far.  
+
No changes so far.
 +
 
 +
== Inventories ==
 +
 
 +
No changes so far.
 +
 
 +
== Plugin Channels ==
 +
 
 +
No changes so far.
  
 
== Play ==
 
== Play ==
Line 36: Line 169:
 
=== Clientbound ===
 
=== Clientbound ===
  
No changes so far.
+
==== Spawn Entity ====
 +
 
 +
Sent by the server when a vehicle or other non-living entity is created.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="13"| 0x00
 +
|rowspan="13"| Play
 +
|rowspan="13"| Client
 +
| Entity ID
 +
| VarInt
 +
| Entity ID.
 +
|-
 +
| Object UUID
 +
| UUID
 +
|
 +
|-
 +
| Type
 +
| VarInt
 +
| The type of entity (same as in [[#Spawn Living Entity|Spawn Living Entity]]).
 +
|-
 +
| X
 +
| Double
 +
|
 +
|-
 +
| Y
 +
| Double
 +
|
 +
|-
 +
| Z
 +
| Double
 +
|
 +
|-
 +
| Pitch
 +
| Angle
 +
| To get the real pitch, you must divide this by (256.0F / 360.0F)
 +
|-
 +
| Yaw
 +
| Angle
 +
| To get the real yaw, you must divide this by (256.0F / 360.0F)
 +
|- {{added}}
 +
| Head Yaw
 +
| Angle
 +
|-
 +
| Data
 +
| Int
 +
| Meaning dependent on the value of the Type field, see [[Object Data]] for details.
 +
|-
 +
| Velocity X
 +
| Short
 +
|rowspan="3"| Same units as [[#Entity Velocity|Entity Velocity]].  Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see [[Object Data]] for details).
 +
|-
 +
| Velocity Y
 +
| Short
 +
|-
 +
| Velocity Z
 +
| Short
 +
|}
 +
 
 +
 
 +
==== Acknowledge Block Changes ====
 +
 
 +
{| class="wikitable" {{Added}}
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="4"| 0x05
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Sequence ID
 +
| VarInt
 +
| Represents the sequence to acknowledge, this is used for properly syncing block changes to the client after interactions.
 +
|-
 +
|}
 +
 
 +
==== Block Action ====
 +
 
 +
This packet is used for a number of actions and animations performed by blocks, usually non-persistent.  The client ignores the provided block type and instead uses the block state in their world.
 +
 
 +
See [[Block Actions]] for a list of values.
 +
 
 +
{{Warning2|This packet uses a block ID, not a block state.}}
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="5"| 0x0B
 +
|rowspan="5"| Play
 +
|rowspan="5"| Client
 +
| Location
 +
| Position
 +
| Block coordinates.
 +
|-
 +
| Action ID (Byte 1)
 +
| Unsigned Byte
 +
| Varies depending on block — see [[Block Actions]].
 +
|-
 +
| Action Param (Byte 2)
 +
| Unsigned Byte
 +
| Varies depending on block — see [[Block Actions]].
 +
|-
 +
| Block Type
 +
| VarInt
 +
| The block type ID for the block.  This must match the block at the given coordinates.
 +
|- {{added}}
 +
| Sequence
 +
| VarInt
 +
|}
 +
 
 +
 
 +
==== Named Sound Effect ====
 +
{{See also|#Sound Effect}}
 +
 
 +
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="8"| {{change|0x19|0x16}}
 +
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
| Sound Name
 +
| Identifier
 +
| All sound effect names as of 1.16.5 can be seen [https://pokechu22.github.io/Burger/1.16.5.html#sounds here].
 +
|-
 +
| Sound Category
 +
| VarInt Enum
 +
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories]).
 +
|-
 +
| Effect Position X
 +
| Int
 +
| Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Effect Position Y
 +
| Int
 +
| Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Effect Position Z
 +
| Int
 +
| Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Volume
 +
| Float
 +
| 1 is 100%, can be more.
 +
|-
 +
| Pitch
 +
| Float
 +
| Float between 0.5 and 2.0 by Notchian clients.
 +
|- {{added}}
 +
| Seed
 +
| long
 +
| Seed used to pick sound varient.
 +
|}
 +
 
 +
==== {{change|Chat Message|Player Chat Msg}} (clientbound) ====
 +
 
 +
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="10"| {{change|0x0F|0x2F}}
 +
|rowspan="10"| Play
 +
|rowspan="10"| Client
 +
| JSON Data
 +
| [[Chat]]
 +
| Limited to 262144 bytes.
 +
|-
 +
| {{change|Position|Type}}
 +
| {{change|Byte|VarInt}}
 +
| 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar), 3: say command, 4: msg command, 5: team msg command, 6: emote command, 7: tellraw command
 +
|-
 +
| Sender
 +
| UUID
 +
| Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
 +
|- {{added}}
 +
| Display Name
 +
| Component
 +
|
 +
|- {{added}}
 +
| Has Team Display Name
 +
| Boolean
 +
| Used in /teammsg
 +
|- {{added}}
 +
| Team Display Name
 +
| Component
 +
| Used in /teammsg
 +
|- {{added}}
 +
| Timestamp
 +
| Long
 +
| Used to check that the message was received within 2 minutes of it being sent.
 +
|- {{added}}
 +
| Salt
 +
| Long
 +
| Cryptography, TODO:
 +
|- {{added}}
 +
| Signature Length
 +
| VarInt
 +
| Array Length
 +
|- {{added}}
 +
| Message Signature
 +
| Bytes
 +
| Cryptography, TODO:
 +
|}
 +
 
 +
==== System Chat Message (clientbound) ====
 +
 
 +
Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options.  See [[Chat#Processing chat|processing chat]] for more info about these positions.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="2"| 0x5C
 +
|rowspan="2"| Play
 +
|rowspan="2"| Client
 +
| JSON Data
 +
| [[Chat]]
 +
| Limited to 262144 bytes.
 +
|-
 +
| Type
 +
| VarInt
 +
| 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar), 3: say command, 4: msg command, 5: team msg command, 6: emote command, 7: tellraw command
 +
|}
 +
 
 +
==== Entity Sound Effect ====
 +
 
 +
Plays a sound effect from an entity.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="6"| {{change|0x5C|0x59}}
 +
|rowspan="6"| Play
 +
|rowspan="6"| Client
 +
| Sound ID
 +
| VarInt
 +
| ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.16.5.html#sounds events] as of 1.16.5).
 +
|-
 +
| Sound Category
 +
| VarInt Enum
 +
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories]).
 +
|-
 +
| Entity ID
 +
| VarInt
 +
|
 +
|-
 +
| Volume
 +
| Float
 +
| 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients.
 +
|-
 +
| Pitch
 +
| Float
 +
| Float between 0.5 and 2.0 by Notchian clients.
 +
|- {{added}}
 +
| Seed
 +
| long
 +
| Seed used to pick sound varient.
 +
|}
 +
 
 +
 
 +
==== Sound Effect ====
 +
 
 +
This packet is used to play a number of hardcoded sound events. For custom sounds, use [[#Named Sound Effect|Named Sound Effect]].
 +
 
 +
{{Warning|Numeric sound effect IDs are liable to change between versions}}
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="8"| {{change|0x5D|0x5A}}
 +
|rowspan="8"| Play
 +
|rowspan="8"| Client
 +
| Sound ID
 +
| VarInt
 +
| ID of hardcoded sound event ([https://pokechu22.github.io/Burger/1.16.5.html#sounds events] as of 1.16.5).
 +
|-
 +
| Sound Category
 +
| VarInt Enum
 +
| The category that this sound will be played from ([https://gist.github.com/konwboj/7c0c380d3923443e9d55 current categories]).
 +
|-
 +
| Effect Position X
 +
| Int
 +
| Effect X multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Effect Position Y
 +
| Int
 +
| Effect Y multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Effect Position Z
 +
| Int
 +
| Effect Z multiplied by 8 ([[Data types#Fixed-point numbers|fixed-point number]] with only 3 bits dedicated to the fractional part).
 +
|-
 +
| Volume
 +
| Float
 +
| 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients.
 +
|-
 +
| Pitch
 +
| Float
 +
| Float between 0.5 and 2.0 by Notchian clients.
 +
|- {{added}}
 +
| Seed
 +
| long
 +
| Seed used to pick sound varient.
 +
|}
  
=== Serverbound ===
+
==== Entity Effect ====
  
No changes so far.
+
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="7"| {{change|0x65|0x62}}
 +
|rowspan="7"| Play
 +
|rowspan="7"| Client
 +
| Entity ID
 +
| VarInt
 +
|
 +
|-
 +
| Effect ID
 +
| VarInt
 +
| See {{Minecraft Wiki|Status effect#Effect IDs|this table}}.
 +
|-
 +
| Amplifier
 +
| Byte
 +
| Notchian client displays effect level as Amplifier + 1.
 +
|-
 +
| Duration
 +
| VarInt
 +
| Duration in ticks.
 +
|-
 +
| Flags
 +
| Byte
 +
| Bit field, see below.
 +
|- {{added}}
 +
| Has Factor Data
 +
| boolean
 +
| Used in DARKNESS effect
 +
|- {{added}}
 +
| Factor Codec
 +
| NBT Tag
 +
| See below
 +
|}
  
== Handshaking ==
+
Within flags:
  
=== Clientbound ===
+
* 0x01: Is ambient - was the effect spawned from a beacon?  All beacon-generated effects are ambient.  Ambient effects use a different icon in the HUD (blue border rather than gray).  If all effects on an entity are ambient, the [[Entity_metadata#Living Entity|"Is potion effect ambient" living metadata field]] should be set to true.  Usually should not be enabled.
 +
* 0x02: Show particles - should all particles from this effect be hidden?  Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory).  Usually should be enabled.
 +
* 0x04: Show icon - should the icon be displayed on the client?  Usually should be enabled.
  
There are no clientbound packets in the Handshaking state, since the protocol immediately switches to a different state after the client sends the first packet.
+
Factor Data
 +
{| class="wikitable"
 +
!Name
 +
!Type
 +
!style="width: 250px;" colspan="2"| Notes
 +
|-
 +
| padding_duration
 +
| TAG_INT
 +
|
 +
|-
 +
| factor_target
 +
| TAG_FLOAT
 +
|
 +
|-
 +
| factor_current
 +
| TAG_FLOAT
 +
|
 +
|-
 +
| effect_changed_timestamp
 +
| TAG_INT
 +
|-
 +
| factor_previous_frame
 +
| TAG_FLOAT
 +
|-
 +
| had_effect_last_tick
 +
| TAG_BOOLEAN
 +
|}
  
 
=== Serverbound ===
 
=== Serverbound ===
  
<!--
+
==== Player Digging ====
==== Handshake ====
 
  
This causes the server to switch into the target state.
+
Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius between the center of the block and 1.5 units from the player's feet (''not'' their eyes).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 63: Line 604:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="4"| 0x00
+
  |rowspan="4"| 0x1A
  |rowspan="4"| Handshaking
+
  |rowspan="4"| Play
 
  |rowspan="4"| Server
 
  |rowspan="4"| Server
  | Protocol Version
+
  | Status
 +
| VarInt Enum
 +
| The action the player is taking against the block (see below).
 +
|-
 +
| Location
 +
| Position
 +
| Block position.
 +
|-
 +
| Face
 +
| Byte Enum
 +
| The face being hit (see below).
 +
|- {{added}}
 +
| Sequence
 +
| VarInt
 +
|}
 +
 
 +
Status can be one of seven values:
 +
 
 +
{| class="wikitable"
 +
! Value
 +
! Meaning
 +
! Notes
 +
|-
 +
| 0
 +
| Started digging
 +
|
 +
|-
 +
| 1
 +
| Cancelled digging
 +
| Sent when the player lets go of the Mine Block key (default: left click).
 +
|-
 +
| 2
 +
| Finished digging
 +
| Sent when the client thinks it is finished.
 +
|-
 +
| 3
 +
| Drop item stack
 +
| Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: Control or Command, depending on OS). Location is always set to 0/0/0, Face is always set to -Y.
 +
|-
 +
| 4
 +
| Drop item
 +
| Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
 +
|-
 +
| 5
 +
| Shoot arrow / finish eating
 +
| Indicates that the currently held item should have its state updated such as eating food, pulling back bows, using buckets, etc. Location is always set to 0/0/0, Face is always set to -Y.
 +
|-
 +
| 6
 +
| Swap item in hand
 +
| Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.
 +
|}
 +
 
 +
The Face field can be one of the following values, representing the face being hit:
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Value
 +
! Offset
 +
! Face
 +
|-
 +
| 0
 +
| -Y
 +
| Bottom
 +
|-
 +
| 1
 +
| +Y
 +
| Top
 +
|-
 +
| 2
 +
| -Z
 +
| North
 +
|-
 +
| 3
 +
| +Z
 +
| South
 +
|-
 +
| 4
 +
| -X
 +
| West
 +
|-
 +
| 5
 +
| +X
 +
| East
 +
|}
 +
 
 +
==== Set Beacon Effect ====
 +
 
 +
Changes the effect of the current beacon.
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="5"| 0x24
 +
|rowspan="5"| Play
 +
|rowspan="5"| Server
 +
|- {{added}}
 +
| Primary Effect Present
 +
| Boolean
 +
|-
 +
| Primary Effect
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|340|341}})
+
  | A [https://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message).
 +
|- {{added}}
 +
| Secondary Effect Present
 +
| Boolean
 +
|  
 
  |-
 
  |-
  | Server Address
+
  | Secondary Effect
  | String
+
  | VarInt
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connectThe Notchian server does not use this information.
+
  | A [https://minecraft.gamepedia.com/Data_values#Potions Potion ID]. (Was a full Integer for the plugin message).
  |-
+
|}
  | Server Port
+
 
  | Unsigned Short
+
==== Use Item ====
  | Default is 25565. The Notchian server does not use this information.
+
 
 +
Sent when pressing the Use Item key (default: right click) with an item in hand.
 +
 
 +
{| class="wikitable"
 +
  ! Packet ID
 +
  ! State
 +
  ! Bound To
 +
  ! Field Name
 +
  ! Field Type
 +
  ! Notes
 
  |-
 
  |-
  | Next State
+
  |rowspan="2"| 0x2F
 +
|rowspan="2"| Play
 +
|rowspan="2"| Server
 +
| Hand
 
  | VarInt Enum
 
  | VarInt Enum
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
+
  | Hand used for the animation. 0: main hand, 1: off hand.
 +
|- {{added}}
 +
| Sequence
 +
| VarInt
 
  |}
 
  |}
-->
+
 
 +
 
  
 
== Status ==
 
== Status ==

Latest revision as of 01:44, 6 May 2022

This page documents the changes from the last stable Minecraft release (currently 1.18.2, protocol 758) to the current pre-release (currently 22w16b, protocol Snapshot 81). 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 so far.

Packets

Packet ID shifts have not been included.

ID Packet name Documentation
Play clientbound
0x02 Spawn Living Entity Current
0x03 Spawn Painting Current
0x05 Sculk Vibration Signal Current
0x05 Acknowledge Block Changes Pre
0x08 Acknowledge Player Digging Current
0x5C System Message Pre
Play serverbound
Handshaking serverbound

New/modified data types

No changes so far.

Entity Metadata

Goat

The base class.

Index Type Meaning Default
0 Boolean Is Screaming Goat false
1 Boolean Has Left Horn true
2 Boolean Has Right Horn true

Painting

The base class.

Index Type Meaning Default
0 VarInt PaintingVariant 0

Player

The base class.

Index Type Meaning Default
0 Float Additional Hearts 0.0
1 VarInt Score 0
2 Byte The Displayed Skin Parts bit mask that is sent in Client Settings 0
Bit mask Meaning
0x01 Cape enabled
0x02 Jacket enabled
0x04 Left sleeve enabled
0x08 Right sleeve enabled
0x10 Left pants leg enabled
0x20 Right pants leg enabled
0x40 Hat enabled
0x80 Unused
3 Byte Main hand (0 : Left, 1 : Right) 1
4 NBT Left shoulder entity data (for occupying parrot) Empty
5 NBT Right shoulder entity data (for occupying parrot) Empty
6 Global Position Optional Last Death Location (used for respawn compass) Empty


Entity

No changes so far.

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Spawn Entity

Sent by the server when a vehicle or other non-living entity is created.

Packet ID State Bound To Field Name Field Type Notes
0x00 Play Client Entity ID VarInt Entity ID.
Object UUID UUID
Type VarInt The type of entity (same as in Spawn Living Entity).
X Double
Y Double
Z Double
Pitch Angle To get the real pitch, you must divide this by (256.0F / 360.0F)
Yaw Angle To get the real yaw, you must divide this by (256.0F / 360.0F)
Head Yaw Angle
Data Int Meaning dependent on the value of the Type field, see Object Data for details.
Velocity X Short Same units as Entity Velocity. Always sent, but only used when Data is greater than 0 (except for some entities which always ignore it; see Object Data for details).
Velocity Y Short
Velocity Z Short


Acknowledge Block Changes

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Sequence ID VarInt Represents the sequence to acknowledge, this is used for properly syncing block changes to the client after interactions.

Block Action

This packet is used for a number of actions and animations performed by blocks, usually non-persistent. The client ignores the provided block type and instead uses the block state in their world.

See Block Actions for a list of values.

Warning.png This packet uses a block ID, not a block state.

Packet ID State Bound To Field Name Field Type Notes
0x0B Play Client Location Position Block coordinates.
Action ID (Byte 1) Unsigned Byte Varies depending on block — see Block Actions.
Action Param (Byte 2) Unsigned Byte Varies depending on block — see Block Actions.
Block Type VarInt The block type ID for the block. This must match the block at the given coordinates.
Sequence VarInt


Named Sound Effect

See also: #Sound Effect

Used to play a sound effect on the client. Custom sounds may be added by resource packs.

Packet ID State Bound To Field Name Field Type Notes
0x19 0x16 Play Client Sound Name Identifier All sound effect names as of 1.16.5 can be seen here.
Sound Category VarInt Enum The category that this sound will be played from (current categories).
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Volume Float 1 is 100%, can be more.
Pitch Float Float between 0.5 and 2.0 by Notchian clients.
Seed long Seed used to pick sound varient.

Chat Message Player Chat Msg (clientbound)

Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options. See processing chat for more info about these positions.

Packet ID State Bound To Field Name Field Type Notes
0x0F 0x2F Play Client JSON Data Chat Limited to 262144 bytes.
Position Type Byte VarInt 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar), 3: say command, 4: msg command, 5: team msg command, 6: emote command, 7: tellraw command
Sender UUID Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
Display Name Component
Has Team Display Name Boolean Used in /teammsg
Team Display Name Component Used in /teammsg
Timestamp Long Used to check that the message was received within 2 minutes of it being sent.
Salt Long Cryptography, TODO:
Signature Length VarInt Array Length
Message Signature Bytes Cryptography, TODO:

System Chat Message (clientbound)

Identifying the difference between Chat/System Message is important as it helps respect the user's chat visibility options. See processing chat for more info about these positions.

Packet ID State Bound To Field Name Field Type Notes
0x5C Play Client JSON Data Chat Limited to 262144 bytes.
Type VarInt 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar), 3: say command, 4: msg command, 5: team msg command, 6: emote command, 7: tellraw command

Entity Sound Effect

Plays a sound effect from an entity.

Packet ID State Bound To Field Name Field Type Notes
0x5C 0x59 Play Client Sound ID VarInt ID of hardcoded sound event (events as of 1.16.5).
Sound Category VarInt Enum The category that this sound will be played from (current categories).
Entity ID VarInt
Volume Float 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients.
Pitch Float Float between 0.5 and 2.0 by Notchian clients.
Seed long Seed used to pick sound varient.


Sound Effect

This packet is used to play a number of hardcoded sound events. For custom sounds, use Named Sound Effect.

Warning.png Numeric sound effect IDs are liable to change between versions

Packet ID State Bound To Field Name Field Type Notes
0x5D 0x5A Play Client Sound ID VarInt ID of hardcoded sound event (events as of 1.16.5).
Sound Category VarInt Enum The category that this sound will be played from (current categories).
Effect Position X Int Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Effect Position Y Int Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Effect Position Z Int Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part).
Volume Float 1.0 is 100%, capped between 0.0 and 1.0 by Notchian clients.
Pitch Float Float between 0.5 and 2.0 by Notchian clients.
Seed long Seed used to pick sound varient.

Entity Effect

Packet ID State Bound To Field Name Field Type Notes
0x65 0x62 Play Client Entity ID VarInt
Effect ID VarInt See this table.
Amplifier Byte Notchian client displays effect level as Amplifier + 1.
Duration VarInt Duration in ticks.
Flags Byte Bit field, see below.
Has Factor Data boolean Used in DARKNESS effect
Factor Codec NBT Tag See below

Within flags:

  • 0x01: Is ambient - was the effect spawned from a beacon? All beacon-generated effects are ambient. Ambient effects use a different icon in the HUD (blue border rather than gray). If all effects on an entity are ambient, the "Is potion effect ambient" living metadata field should be set to true. Usually should not be enabled.
  • 0x02: Show particles - should all particles from this effect be hidden? Effects with particles hidden are not included in the calculation of the effect color, and are not rendered on the HUD (but are still rendered within the inventory). Usually should be enabled.
  • 0x04: Show icon - should the icon be displayed on the client? Usually should be enabled.

Factor Data

Name Type Notes
padding_duration TAG_INT
factor_target TAG_FLOAT
factor_current TAG_FLOAT
effect_changed_timestamp TAG_INT
factor_previous_frame TAG_FLOAT
had_effect_last_tick TAG_BOOLEAN

Serverbound

Player Digging

Sent when the player mines a block. A Notchian server only accepts digging packets with coordinates within a 6-unit radius between the center of the block and 1.5 units from the player's feet (not their eyes).

Packet ID State Bound To Field Name Field Type Notes
0x1A Play Server Status VarInt Enum The action the player is taking against the block (see below).
Location Position Block position.
Face Byte Enum The face being hit (see below).
Sequence VarInt

Status can be one of seven values:

Value Meaning Notes
0 Started digging
1 Cancelled digging Sent when the player lets go of the Mine Block key (default: left click).
2 Finished digging Sent when the client thinks it is finished.
3 Drop item stack Triggered by using the Drop Item key (default: Q) with the modifier to drop the entire selected stack (default: Control or Command, depending on OS). Location is always set to 0/0/0, Face is always set to -Y.
4 Drop item Triggered by using the Drop Item key (default: Q). Location is always set to 0/0/0, Face is always set to -Y.
5 Shoot arrow / finish eating Indicates that the currently held item should have its state updated such as eating food, pulling back bows, using buckets, etc. Location is always set to 0/0/0, Face is always set to -Y.
6 Swap item in hand Used to swap or assign an item to the second hand. Location is always set to 0/0/0, Face is always set to -Y.

The Face field can be one of the following values, representing the face being hit:

Value Offset Face
0 -Y Bottom
1 +Y Top
2 -Z North
3 +Z South
4 -X West
5 +X East

Set Beacon Effect

Changes the effect of the current beacon.

Packet ID State Bound To Field Name Field Type Notes
0x24 Play Server
Primary Effect Present Boolean
Primary Effect VarInt A Potion ID. (Was a full Integer for the plugin message).
Secondary Effect Present Boolean
Secondary Effect VarInt A Potion ID. (Was a full Integer for the plugin message).

Use Item

Sent when pressing the Use Item key (default: right click) with an item in hand.

Packet ID State Bound To Field Name Field Type Notes
0x2F Play Server Hand VarInt Enum Hand used for the animation. 0: main hand, 1: off hand.
Sequence VarInt


Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.