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|1.8.8, protocol 47]]) to the current pre-release (currently [[Protocol version numbers|15w31c, protocol 51]]). 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|1.15.2, protocol 578]]) to the current pre-release (currently [[Protocol version numbers|1.16.3, protocol 753]]). 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 ===
 +
 
 +
The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT).  This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.
  
None so far.
+
=== Packets ===
  
== Handshaking ==
+
{| class="wikitable"
 +
! ID
 +
! Packet name
 +
!colspan="2"| Documentation
 +
|-
 +
!colspan="4"| Handshaking serverbound
 +
{{PacketList|0x00|Handshake}}
 +
|-
 +
!colspan="4"| Play clientbound
 +
{{PacketList|0x02|Spawn Weather Entity|pre=removed}}
 +
{{PacketList|{{change|0x03|0x02}}|Spawn Living Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x04|0x03}}|Spawn Painting|pre=unchanged}}
 +
{{PacketList|{{change|0x05|0x04}}|Spawn Player|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x05}}|Entity Animation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x06}}|Statistics|pre=unchanged}}
 +
{{PacketList|{{change|0x08|0x07}}|Acknowledge Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x08}}|Block Break Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x0A|0x09}}|Block Entity Data|pre=unchanged}}
 +
{{PacketList|{{change|0x0B|0x0A}}|Block Action|pre=unchanged}}
 +
{{PacketList|{{change|0x0C|0x0B}}|Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x0D|0x0C}}|Boss Bar|pre=unchanged}}
 +
{{PacketList|{{change|0x0E|0x0D}}|Server Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x0F|0x0E}}|Chat Message (clientbound)}}
 +
{{PacketList|{{change|0x11|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x10}}|Declare Commands|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x11}}|Window Confirmation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x12}}|Close Window (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x13}}|Window Items|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x14}}|Window Property|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x15}}|Set Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x16}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x17}}|Plugin Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x18}}|Named Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x19}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1A}}|Entity Status|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1B}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1C}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x1D}}|Change Game State|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x1E}}|Open Horse Window|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x1F}}|Keep Alive (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x20}}|Chunk Data}}
 +
{{PacketList|{{change|0x23|0x21}}|Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x22}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x23}}|Update Light}}
 +
{{PacketList|{{change|0x26|0x24}}|Join Game}}
 +
{{PacketList|{{change|0x27|0x25}}|Map Data|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x26}}|Trade List|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x27}}|Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x28}}|Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x29}}|Entity Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2A}}|Entity Movement|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2B}}|Vehicle Move (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2C}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x2D}}|Open Window|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x2E}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x31|0x2F}}|Craft Recipe Response|pre=unchanged}}
 +
{{PacketList|{{change|0x32|0x30}}|Player Abilities (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x31}}|Combat Event|pre=unchanged}}
 +
{{PacketList|{{change|0x34|0x32}}|Player Info|pre=unchanged}}
 +
{{PacketList|{{change|0x35|0x33}}|Face Player|pre=unchanged}}
 +
{{PacketList|{{change|0x36|0x34}}|Player Position And Look (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x37|0x35}}|Unlock Recipes}}
 +
{{PacketList|{{change|0x38|0x36}}|Destroy Entities|pre=unchanged}}
 +
{{PacketList|{{change|0x39|0x37}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x38}}|Resource Pack Send|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x39}}|Respawn}}
 +
{{PacketList|{{change|0x3C|0x3A}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x3B}}|Multi Block Change}}
 +
{{PacketList|{{change|0x3D|0x3C}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x3E|0x3D}}|World Border|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x3E}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x3F}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x40}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x41}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|0x47|Entity Equipment}}
 +
{{PacketList|{{change|0x4E|0x42}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x4F|0x4E}}|Time Update|pre=unchanged}}
 +
{{PacketList|{{change|0x50|0x4F}}|Title|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x50}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x51}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x52}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x53}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x54}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x55}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x56}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x57}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x58}}|Entity Properties}}
 +
{{PacketList|{{change|0x5A|0x59}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x5A}}|Declare Recipes}}
 +
{{PacketList|{{change|0x5C|0x5B}}|Tags|pre=unchanged}}
 +
|-
 +
!colspan="4"| Play serverbound
 +
{{PacketList|0x0E|Interact Entity}}
 +
{{PacketList|0x0F|Generate Structure|rel=added}}
 +
{{PacketList|{{change|0x0F|0x10}}|Keep Alive (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x11}}|Lock Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x11|0x12}}|Player Position|pre=unchanged}}
 +
{{PacketList|{{change|0x12|0x13}}|Player Position And Rotation (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Player Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Player Movement|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Vehicle Move (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Steer Boat|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Pick Item|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Craft Recipe Request|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Player Abilities (serverbound)}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Entity Action|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Steer Vehicle|pre=unchanged}}
 +
{{PacketList|0x1D|Recipe Book Data|pre=removed}}
 +
{{PacketList|0x1E|Set Displayed Recipe|rel=added}}
 +
{{PacketList|0x1F|Set Recipe Book State|rel=added}}
 +
{{PacketList|{{change|0x1E|0x20}}|Name Item|pre=unchanged}}
 +
{{PacketList|{{change|0x1F|0x21}}|Resource Pack Status|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x22}}|Advancement Tab|pre=unchanged}}
 +
{{PacketList|{{change|0x21|0x23}}|Select Trade|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x24}}|Set Beacon Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x25}}|Held Item Change (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x24|0x26}}|Update Command Block|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x27}}|Update Command Block Minecart|pre=unchanged}}
 +
{{PacketList|{{change|0x26|0x28}}|Creative Inventory Action|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x29}}|Update Jigsaw Block}}
 +
{{PacketList|{{change|0x28|0x2A}}|Update Structure Block|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2B}}|Update Sign|pre=unchanged}}
 +
{{PacketList|{{change|0x2A|0x2C}}|Animation (serverbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2B|0x2D}}|Spectate|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2E}}|Player Block Placement|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2F}}|Use Item|pre=unchanged}}
 +
|-
 +
!colspan="4"| Login clientbound
 +
{{PacketList|0x02|Login Success}}
 +
|}
  
=== Clientbound ===
+
== New/modified data types ==
  
 
No changes so far.
 
No changes so far.
  
=== Serverbound ===
+
== Entity Metadata ==
 +
 
 +
{{#vardefine:meta_prerelease|1}}
  
==== Handshake ====
+
=== FishingHook ===
  
This causes the server to switch into the target state.
+
{{Metadata inherit|FishingHook|inherits=Entity|start_at=7}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="4"| 0x00
+
  | {{Metadata id|}}
|rowspan="4"| Handshaking
 
|rowspan="4"| Server
 
| Protocol Version
 
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{Change|47|50}})
+
  |colspan="2"| Hooked entity id + 1, or 0 if there is no hooked entity
 +
| 0
 +
|- {{Added}}
 +
| {{Metadata id|added}}
 +
| Boolean
 +
|colspan="2"| Is catchable
 +
| False
 +
|}
 +
 
 +
=== Abstract Arrow ===
 +
 
 +
{{Metadata inherit|Abstract Arrow|inherits=Entity|start_at=7}}
 +
 
 +
Abstract base class for [[#Tipped Arrow|Tipped Arrow]] (which is used for regular arrows as well as tipped ones) and [[#Spectral Arrow|Spectral Arrow]].
 +
 
 +
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
| rowspan="3" | {{Metadata id|}}
 +
| rowspan="3" | Byte
 +
! Bit mask
 +
! Meaning
 +
| rowspan="3" | 0
 +
|-
 +
| 0x01
 +
| Is critical
 
  |-
 
  |-
  | Server Address
+
  | 0x02
  | String
+
  | Is noclip (used by loyalty tridents when returning)
  | hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
+
  |- {{removed}}
  |-
+
  | {{Metadata id|removed}}
  | Server Port
+
  | OptUUID
  | Unsigned Short
+
  |colspan="2"| Unused
  | default is 25565
+
  | Empty
 
  |-
 
  |-
  | Next State
+
  | {{Metadata id|}}
  | VarInt
+
  | Byte
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
+
  |colspan="2"| Peircing level
 +
| 0
 
  |}
 
  |}
  
== Play ==
+
=== Tipped Arrow ===
  
=== Clientbound ===
+
{{Metadata inherit|Tipped Arrow|inherits=Abstract Arrow}}
  
==== Entity Equipment ====
+
Used for both tipped and regular arrows.  If not tipped, then color is set to -1 and no tipped arrow particles are used.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  | {{Metadata id|}}
|rowspan="3"| Play
 
|rowspan="3"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | Entity's EID
+
  |colspan="2"| Color (-1 for no particles)
|-
+
  | -1
| Slot
 
| {{Change|Short|VarInt}}
 
| Equipment slot. 0: main hand, {{Change||1: off hand}}, {{Change|1–4|2–5}}: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 
  |-
 
| Item
 
| [[Slot Data|Slot]]
 
| Item in slot format
 
 
  |}
 
  |}
  
==== Spawn Object ====
+
=== Spectral Arrow ===
 +
 
 +
{{Metadata inherit|Spectral Arrow|inherits=Abstract Arrow}}
 +
 
 +
No additional metadata.
  
Sent by the server when an object/vehicle is created.
+
=== Trident ===
 +
 
 +
{{Metadata inherit|Trident|inherits=Abstract Arrow}}
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="9"| 0x0E
+
  | {{Metadata id|}}
|rowspan="9"| Play
 
|rowspan="9"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | EID of the object
+
  |colspan="2"| Loyalty level (enchantment)
|- style="background-color: #d9ead3;"
+
  | 0
| Object UUID
 
| UUID
 
  |  
 
 
  |-
 
  |-
  | Type
+
  | {{Metadata id|}}
| Byte
+
  | Boolean
| The type of object (See [[Entities#Objects]])
+
  |colspan="2"| Has enchantment glint
|-
+
  | False
| X
 
| Int
 
| X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
  |-
 
  | Pitch
 
| Angle
 
|
 
|-
 
| Yaw
 
| Angle
 
|
 
|-
 
| Data
 
| [[Object Data]]
 
  |  
 
 
  |}
 
  |}
  
==== Spawn Mob ====
+
=== Strider ===
  
Sent by the server when a mob entity is spawned.
+
{{Metadata inherit|Strider|inherits=Animal|start_at=16}}
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
  ! Packet ID
+
  ! Index
  ! State
+
  ! Type
! Bound To
+
  !style="width: 250px;" colspan="2"| Meaning
! Field Name
+
  ! Default
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="13"| 0x0F
+
  | {{Metadata id|}}
|rowspan="13"| Play
 
|rowspan="13"| Client
 
| Entity ID
 
 
  | VarInt
 
  | VarInt
  |  
+
  |colspan="2"| Total time to "boost" with warped fungus on a stick for
|- style="background-color: #d9ead3;"
+
  | 0
| Entity UUID
 
| UUID
 
  |  
 
 
  |-
 
  |-
  | Type
+
  | {{Metadata id|}}
  | Unsigned Byte
+
  | Boolean
  | The type of mob. See [[Entities#Mobs]]
+
|colspan="2"| Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava))
 +
  | false
 
  |-
 
  |-
  | X
+
  | {{Metadata id|}}
  | Int
+
  | Boolean
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |colspan="2"| Has saddle
 +
| false
 +
|}
 +
 
 +
=== Hoglin ===
 +
 
 +
{{Metadata inherit|Hoglin|inherits=Animal|start_at=16}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Y
+
  | {{Metadata id|}}
  | Int
+
  | Boolean
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |colspan="2"| Is immune to zombification
 +
| false
 +
|}
 +
 
 +
=== Zoglin ===
 +
 
 +
{{Metadata inherit|Hoglin|inherits=Monster|start_at=15}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Z
+
  | {{Metadata id|}}
  | Int
+
  | Boolean
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  |colspan="2"| Is baby
 +
| false
 +
|}
 +
 
 +
=== Base Piglin ===
 +
 
 +
{{Metadata inherit|Base Piglin|inherits=Monster|start_at=15}}
 +
 
 +
{| class="wikitable" {{added}}
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Yaw
+
  | {{Metadata id|}}
  | Angle
+
| Boolean
  |  
+
  |colspan="2"| Is immune to zombification
 +
| false
 +
|}
 +
 
 +
=== Piglin ===
 +
 
 +
{{Metadata inherit|Piglin|inherits=Base Piglin}}
 +
 
 +
{| class="wikitable" {{added}}
 +
  ! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Pitch
+
  | {{Metadata id|}}
  | Angle
+
  | Boolean
  |  
+
|colspan="2"| Is baby
 +
  | false
 
  |-
 
  |-
  | Head Pitch
+
  | {{Metadata id|}}
  | Angle
+
  | Boolean
  |  
+
|colspan="2"| Is charging crossbow
 +
  | false
 
  |-
 
  |-
  | Velocity X
+
  | {{Metadata id|}}
  | Short
+
  | Boolean
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  |colspan="2"| Is dancing
 +
| false
 +
|}
 +
 
 +
=== Piglin Brute ===
 +
 
 +
{{Metadata inherit|Piglin Brute|inherits=Base Piglin}}
 +
 
 +
No additional metadata.
 +
 
 +
=== Wolf ===
 +
 
 +
{{Metadata inherit|Wolf|inherits=TameableAnimal|start_at=18}}
 +
 
 +
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Velocity Y
+
  | {{Metadata id|}}
  | Short
+
  | Boolean
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  |colspan="2"| Is begging
 +
| false
 
  |-
 
  |-
  | Velocity Z
+
  | {{Metadata id|}}
  | Short
+
  | VarInt
  | Same units as [[Protocol#Entity Velocity|Entity Velocity]]
+
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
  |-
+
| 14 (Red)
  | Metadata
+
  |- {{Added}}
  | [[Entities#Entity Metadata Format|Metadata]]
+
  | {{Metadata id|}}
  |  
+
| VarInt
 +
  |colspan="2"| Anger time
 +
  | 0
 
  |}
 
  |}
  
==== Combat Event ====
+
=== {{Change|Zombie Pigman|Zombified Piglin}} ===
 +
 
 +
{{Metadata inherit|{{Change|Zombie Pigman|Zombified Piglin}}|inherits=Zombie|start_at=18}}
 +
 
 +
No additional metadata.
 +
 
 +
== Block Actions ==
 +
 
 +
No changes so far.
 +
 
 +
== Inventories ==
 +
 
 +
No changes so far.
 +
 
 +
== Plugin Channels ==
 +
 
 +
No changes so far.
 +
 
 +
== Play ==
 +
 
 +
=== Clientbound ===
 +
 
 +
==== 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.
 +
 
 +
{{warning2|Game info accepts json formatting but does not display it, although the deprecated §-based formatting works.  This is not an issue when using the [[#Title|Title]] packet, so prefer that packet for displaying information in that slot.  See [https://bugs.mojang.com/browse/MC-119145 MC-119145] for more information.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 211: Line 422:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x42
+
  |rowspan="3"| {{change|0x0F|0x0E}}
  |rowspan="6"| Play
+
  |rowspan="3"| Play
  |rowspan="6"| Client
+
  |rowspan="3"| Client
  | Event
+
  | JSON Data
  | VarInt
+
  | [[Chat]]
  | 0: enter combat, 1: end combat, 2: entity dead
+
  | Limited to 32767 bytes
 
  |-
 
  |-
  | Duration
+
  | Position
  | Optional VarInt
+
  | Byte
  | Only for end combat
+
  | 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
  |-
+
  |- {{added}}
  | Player ID
+
  | Sender
| Optional VarInt
+
  | UUID
| Only for entity dead
+
  | Used by the Notchian client for the disableChat launch option. Setting both longs to 0 will always display the message regardless of the setting.
|-
 
  | Entity ID
 
| Optional Int
 
| Only for end combat and entity dead
 
|-
 
| Message
 
| {{Change|String|[[Chat]]}}
 
  | Only for entity dead
 
 
  |}
 
  |}
  
==== Boss Bar ====  
+
==== Chunk Data ====
This packet replaces Update Entity NBT packet which has been removed.
+
{{Main|Chunk Format}}
 +
{{See also|#Unload Chunk}}
 +
 
 +
{{Need Info|How do biomes work now?  The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed...  ([https://www.reddit.com/r/Mojira/comments/e5at6i/a_discussion_for_the_changes_to_how_biomes_are/ /r/mojira discussion] which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)}}
 +
 
 +
The server only sends skylight information for chunk pillars in the {{Minecraft Wiki|Overworld}}, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
 +
 
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="15"| 0x49
+
  |rowspan="11"| {{change|0x22|0x20}}
  |rowspan="15"| Play
+
  |rowspan="11"| Play
  |rowspan="15"| Client
+
  |rowspan="11"| Client
  |colspan="2"| UUID
+
  | Chunk X
  | UUID
+
  | Int
  | Unique ID for this bar
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |colspan="2"| Action
+
  | Chunk Z
  | VarInt
+
  | Int
  |  
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  ! Action
+
  | Full chunk
  ! Field Name
+
  | Boolean
  !
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
!
 
 
  |-
 
  |-
  |rowspan="5"| 0: add
+
  | Primary Bit Mask
  | Title
+
  | VarInt
| [[Chat]]
+
  | Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
  |  
 
 
  |-
 
  |-
  | Health
+
  | Heightmaps
  | Float
+
  | [[NBT]]
  |  
+
  | Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|- {{Added}}
 +
| Biomes length
 +
| Optional VarInt
 +
| Size of the following array.  Not present if full chunk is false.
 
  |-
 
  |-
  | Color
+
  | Biomes
 +
| Optional array of {{change|Integer|VarInt}}
 +
| {{change|1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.|Possibly something else.}}  Not present if full chunk is false.
 +
|-
 +
| Size
 
  | VarInt
 
  | VarInt
  | Color ID (see below)
+
  | Size of Data in bytes
 
  |-
 
  |-
  | Dividers
+
  | Data
  | VarInt
+
  | Byte array
|
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
|-
 
| Flags
 
| Unsigned Byte
 
  | Bit mask: 0x1 should darken sky, 0x2: is dragon bar
 
|-
 
| 1: remove
 
| ''no fields''
 
| ''no fields''
 
| Removes this boss bar
 
|-
 
| 2: update health
 
| Health
 
| Float
 
|
 
|-
 
| 3: update title
 
| Title
 
| [[Chat]]
 
|
 
|-
 
|rowspan="2"| 4: update style
 
| Color
 
| VarInt
 
|
 
 
  |-
 
  |-
  | Dividers
+
  | Number of block entities
 
  | VarInt
 
  | VarInt
  |  
+
  | Number of elements in the following array
|-
 
| 5: update flags
 
| Flags
 
| Unsigned Byte
 
|
 
 
  |-
 
  |-
 +
| Block entities
 +
| Array of [[NBT|NBT Tag]]
 +
| All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
{| class="wikitable"
+
Note that the Notchian client requires an [[#Update View Position|Update View Position]] packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.
! ID
 
! Color
 
|-
 
| 0
 
| Pink(ish)
 
|-
 
| 1
 
| Cyan
 
|-
 
| 2
 
| Red
 
|-
 
| 3
 
| Lime
 
|-
 
| 4
 
| Yellow
 
|-
 
| 5
 
| Purple
 
|-
 
| 6
 
| White
 
|}
 
  
=== Serverbound ===
+
{{Change||The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.}}
  
==== Use Entity ====
+
New format, 5 bits per block, containing the following references to blocks in a palette (not shown): <span style="border: solid 2px hsl(0, 90%, 60%)">1</span><span style="border: solid 2px hsl(30, 90%, 60%)">2</span><span style="border: solid 2px hsl(60, 90%, 60%)">2</span><span style="border: solid 2px hsl(90, 90%, 60%)">3</span><span style="border: solid 2px hsl(120, 90%, 60%)">4</span><span style="border: solid 2px hsl(150, 90%, 60%)">4</span><span style="border: solid 2px hsl(180, 90%, 60%)">5</span><span style="border: solid 2px hsl(210, 90%, 60%)">6</span><span style="border: solid 2px hsl(240, 90%, 60%)">6</span><span style="border: solid 2px hsl(270, 90%, 60%)">4</span><span style="border: solid 2px hsl(300, 90%, 60%)">8</span><span style="border: solid 2px hsl(330, 90%, 60%)">0</span><span style="border: solid 2px hsl(0, 90%, 30%)">7</span><span style="border: solid 2px hsl(30, 90%, 30%)">4</span><span style="border: solid 2px hsl(60, 90%, 30%)">3</span><span style="border: solid 2px hsl(90, 90%, 30%)">13</span><span style="border: solid 2px hsl(120, 90%, 30%)">15</span><span style="border: solid 2px hsl(150, 90%, 30%)">16</span><span style="border: solid 2px hsl(180, 90%, 30%)">9</span><span style="border: solid 2px hsl(210, 90%, 30%)">14</span><span style="border: solid 2px hsl(240, 90%, 30%)">10</span><span style="border: solid 2px hsl(270, 90%, 30%)">12</span><span style="border: solid 2px hsl(300, 90%, 30%)">0</span><span style="border: solid 2px hsl(330, 90%, 30%)">2</span>
  
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
+
<code>0020863148418841</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 60%)">00000</span><span style="outline: solid 2px hsl(300, 90%, 60%)">01000</span><span style="outline: solid 2px hsl(270, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(240, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(210, 90%, 60%)">00110</span><span style="outline: solid 2px hsl(180, 90%, 60%)">00101</span><span style="outline: solid 2px hsl(150, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(120, 90%, 60%)">00100</span><span style="outline: solid 2px hsl(90, 90%, 60%)">00011</span><span style="outline: solid 2px hsl(60, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(30, 90%, 60%)">00010</span><span style="outline: solid 2px hsl(0, 90%, 60%)">00001</span></code><br>
 +
<code>01018A7260F68C87</code> <code><span style="outline: dashed 2px black">0000</span><span style="outline: solid 2px hsl(330, 90%, 30%)">00010</span><span style="outline: solid 2px hsl(300, 90%, 30%)">00000</span><span style="outline: solid 2px hsl(270, 90%, 30%)">01100</span><span style="outline: solid 2px hsl(240, 90%, 30%)">01010</span><span style="outline: solid 2px hsl(210, 90%, 30%)">01110</span><span style="outline: solid 2px hsl(180, 90%, 30%)">01001</span><span style="outline: solid 2px hsl(150, 90%, 30%)">10000</span><span style="outline: solid 2px hsl(120, 90%, 30%)">01111</span><span style="outline: solid 2px hsl(90, 90%, 30%)">01101</span><span style="outline: solid 2px hsl(60, 90%, 30%)">00011</span><span style="outline: solid 2px hsl(30, 90%, 30%)">00100</span><span style="outline: solid 2px hsl(0, 90%, 30%)">00111</span></code>
  
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.
+
==== Update Light ====
  
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
+
Updates light levels for a chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 353: Line 519:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| 0x02
+
  |rowspan="11"| {{change|0x25|0x23}}
  |rowspan="6"| Play
+
  |rowspan="11"| Play
  |rowspan="6"| Server
+
  |rowspan="11"| Client
  | Target
+
|colspan="2"| Chunk X
  | VarInt
+
|colspan="2"| VarInt
  |  
+
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|-
 +
|colspan="2"| Chunk Z
 +
|colspan="2"| VarInt
 +
| Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{added}}
 +
|colspan="2"| Trust Edges
 +
|colspan="2"| Boolean
 +
| If edges should be trusted for light updates.
 +
|
 +
|-
 +
|colspan="2"| Sky Light Mask
 +
  |colspan="2"| VarInt
 +
  | Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
 +
|-
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
  | Mask containing 18 bits, with the same order as sky light
 +
|-
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their sky light values.  If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the sky light arrays.
 +
|-
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, which indicates sections that have 0 for all their block light values.  If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks).  If it is only set in this mask, it is not included in the block light arrays.
 
  |-
 
  |-
  | Type
+
  |rowspan="2"| Sky Light arrays
 +
| Length
 +
|rowspan="2"| Array
 
  | VarInt
 
  | VarInt
  | 0: interact, 1: attack, 2: interact at
+
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Target X
+
  | Sky Light array
  | Optional Float
+
  | Array of 2048 bytes
  | Only if Type is interact at
+
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest value.  Half a byte per light value.
 
  |-
 
  |-
  | Target Y
+
  |rowspan="2"| Block Light arrays
  | Optional Float
+
| Length
  | Only if Type is interact at
+
|rowspan="2"| Array
 +
  | VarInt
 +
  | Length of the following array in bytes (always 2048)
 
  |-
 
  |-
  | Target Z
+
  | Block Light array
  | Optional Float
+
  | Array of 2048 bytes
  | Only if Type is interact at
+
  | There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.
|- style="background-color: #d9ead3;"
 
| Hand
 
| Optional Byte
 
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
 
 
  |}
 
  |}
  
==== Player Digging ====
+
Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.
  
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.
+
==== Join Game ====
 +
 
 +
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 397: Line 590:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x07
+
  |rowspan="17"| {{change|0x26|0x24}}
  |rowspan="3"| Play
+
  |rowspan="17"| Play
  |rowspan="3"| Server
+
  |rowspan="17"| Client
  | Status
+
  | Entity ID
  | Byte
+
  | Int
  | The action the player is taking against the block (see below)
+
  | The player's Entity ID (EID)
 
  |-
 
  |-
  | Location
+
  | Is hardcore
  | Position
+
  | Boolean
  | Block position
+
  |
 
  |-
 
  |-
  | Face
+
  | Gamemode
  | Byte
+
  | Unsigned Byte
  | The face being hit (see below)
+
  | 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. {{change|Bit 3 (0x8) is the hardcore flag.}}
  |}
+
|- {{Added}}
 
+
| Previous Gamemode
Status can be one of seven values:
+
| Unsigned Byte
 
+
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
{| class="wikitable"
+
  |- {{Added}}
  ! Meaning
+
| World Count
  ! Value
+
| VarInt
 +
| Size of the following array
 +
|- {{Added}}
 +
| World Names
 +
| Array of Identifier
 +
| Identifiers for all worlds on the server
 +
|- {{Added}}
 +
| Dimension Codec
 +
  | [[NBT|NBT Tag Compound]]
 +
  | The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
 
  |-
 
  |-
  | Started digging
+
  | Dimension
  | <code>0</code>
+
  | {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
 +
| {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent before this}}
 +
|- {{Added}}
 +
| World Name
 +
| Identifier
 +
| Name of the world being spawned into
 
  |-
 
  |-
  | Cancelled digging
+
  | Hashed seed
  | <code>1</code>
+
  | Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 
  |-
 
  |-
  | Finished digging
+
  | Max Players
  | <code>2</code>
+
  | {{change|Unsigned Byte|VarInt}}
 +
| Was once used by the client to draw the player list, but now is ignored
 +
|- {{Removed}}
 +
| Level Type
 +
| String Enum (16)
 +
| default, flat, largeBiomes, amplified, customized, buffet, default_1_1
 
  |-
 
  |-
  | Drop item stack
+
  | View Distance
  | <code>3</code>
+
  | VarInt
 +
| Render distance (2-32)
 
  |-
 
  |-
  | Drop item
+
  | Reduced Debug Info
  | <code>4</code>
+
  | Boolean
 +
| If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
 
  |-
 
  |-
  | Shoot arrow / finish eating
+
  | Enable respawn screen
  | <code>5</code>
+
  | Boolean
  |- style="background-color: #d9ead3;"
+
| Set to false when the doImmediateRespawn gamerule is true
  | Swap item in Hand
+
  |- {{Added}}
  | <code>6</code>
+
| Is Debug
 +
| Boolean
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 +
|- {{Added}}
 +
| Is Flat
 +
  | Boolean
 +
  | True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 
  |}
 
  |}
  
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 sends a 1 (cancel digging).
+
{{Need Info|Lay out and explain the format}}
  
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, Location set to 0/0/0, and Face set to 0, is sent from client to server. Status code 3 is similar, but drops the entire stack.
+
'''[https://paste.gg/p/KennyTV/ad46ef552c6443cc808385f060564550 Default Vanilla Dimension/Biome Codec]'''
  
Status code 5 (shoot arrow / finish eating) is also a special case. Location is set to 0/0/0 like above, but the face field is set to 255.
+
Known dimension attributes:
 
 
Status code 6 is another special case. Used to swap or assign an item to the second hand. Location is set to 0/0/0 and Face is set to 0.
 
 
 
The Face field can be one of six values, representing the face being hit:
 
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Name
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Values
 +
|-
 +
| name
 +
| String
 +
|colspan="2"| Dimension's name
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 +
|-
 +
| piglin_safe
 +
| Byte
 +
|colspan="2"| Whether piglins shake and transform to zombified piglins.
 +
| 1: true, 0: false
 +
|-
 +
| natural
 +
| Byte
 +
|colspan="2"| When false, compasses spin randomly. When true, nether portals can spawn zombified piglins.
 +
| 1: true, 0: false
 +
|-
 +
| ambient_light
 +
| Float
 +
|colspan="2"| How much light the dimension has.
 +
| 0.0 to 1.0
 +
|-
 +
| fixed_time
 +
| Long
 +
|colspan="2"| If this is set to a number, the time of the day is the specified value.
 +
| false, or 0 to 24000
 +
|-
 +
| infiniburn
 +
| String
 +
|colspan="2"| A resource location defining what block tag to use for infiniburn.
 +
| "" or minecraft resource "minecraft:..."
 +
|-
 +
| respawn_anchor_works
 +
| Byte
 +
|colspan="2"| Whether players can charge and use respawn anchors.
 +
| 1: true, 0: false
 +
|-
 +
| has_skylight
 +
| Byte
 +
|colspan="2"| Whether the dimension has skylight access or not.
 +
| 1: true, 0: false
 +
|-
 +
| bed_works
 +
| Byte
 +
|colspan="2"| Whether players can use a bed to sleep.
 +
| 1: true, 0: false
 +
|-
 +
| effects
 +
| String
 +
|colspan="2"| ?
 +
| "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
 +
|-
 +
| has_raids
 +
| Byte
 +
|colspan="2"| Whether players with the Bad Omen effect can cause a raid.
 +
| 1: true, 0: false
 +
|-
 +
| logical_height
 +
| Int
 +
|colspan="2"| The maximum height to which chorus fruits and nether portals can bring players within this dimension.
 +
| 0-256
 
  |-
 
  |-
  ! Value
+
  | coordinate_scale
  | 0
+
| Float
  | 1
+
|colspan="2"| The multiplier applied to coordinates when traveling to the dimension.
  | 2
+
  | 1: true, 0: false
  | 3
+
  |-
  | 4
+
  | ultrawarm
  | 5
+
  | Byte
 +
  |colspan="2"| Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner.
 +
  | 1: true, 0: false
 
  |-
 
  |-
! Offset
+
  | has_ceiling
  | -Y
+
  | Byte
  | +Y
+
  |colspan="2"| Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster.
  | -Z
+
  | 1: true, 0: false
| +Z
 
| -X
 
  | +X
 
 
  |}
 
  |}
  
==== {{Change||Use Item}} ====
+
==== Unlock Recipes ====
 
 
Sent when pressing the Use Item key (default: right click) with an item in hand.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 482: Line 760:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x08
+
  |rowspan="14"| {{Change|0x37|0x35}}
  |rowspan="1"| Play
+
  |rowspan="14"| Play
  |rowspan="1"| Server
+
  |rowspan="14"| Client
  | Hand
+
  |-
  | Byte
+
  | Action
  | Hand used for the animation
+
  | VarInt
  |}
+
  | 0: init, 1: add, 2: remove
 
 
==== Player Block Placement ====
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Packet ID
+
  | Crafting Recipe Book Open
  ! State
+
  | Boolean
  ! Bound To
+
  | If true, then the crafting recipe book will be open when the player opens its inventory.
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x08|0x09}}
+
  | Crafting Recipe Book Filter Active
|rowspan="6"| Play
+
  | Boolean
|rowspan="6"| Server
+
  | If true, then the filtering option is active when the players opens its inventory.
| Location
 
  | Position
 
  | Block position
 
 
  |-
 
  |-
  | Face
+
  | Smelting Recipe Book Open
  | {{Change|Byte|VarInt}}
+
  | Boolean
  | The face on which the block is placed (see above)
+
  | If true, then the smelting recipe book will be open when the player opens its inventory.
 
  |-
 
  |-
  | {{Change|Held Item|Hand}}
+
  | Smelting Recipe Book Filter Active
  | {{Change|[[Slot Data|Slot]]|VarInt}}
+
| Boolean
  | The hand from which the block is placed; 0: main hand, 1: off hand
+
| If true, then the filtering option is active when the players opens its inventory.
 +
|- {{added}}
 +
| Blast Furance Recipe Book Open
 +
| Boolean
 +
| If true, then the blast furnace recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
  | Blast Furance Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|- {{added}}
 +
| Smoker Recipe Book Open
 +
| Boolean
 +
| If true, then the smoker recipe book will be open when the player opens its inventory.
 +
|- {{added}}
 +
  | Smoker Recipe Book Filter Active
 +
| Boolean
 +
| If true, then the filtering option is active when the players opens its inventory.
 +
|-
 +
| Array size 1
 +
| VarInt
 +
| Number of elements in the following array
 
  |-
 
  |-
  | Cursor Position X
+
  | Recipe IDs
  | Byte
+
  | Array of Identifier
  | The position of the crosshair on the block
+
  |
 
  |-
 
  |-
  | Cursor Position Y
+
  | Array size 2
  | Byte
+
  | Optional VarInt
  |  
+
  | Number of elements in the following array, only present if mode is 0 (init)
 
  |-
 
  |-
  | Cursor Position Z
+
  | Recipe IDs
  | Byte
+
  | Optional Array of Identifier, only present if mode is 0 (init)
  |  
+
  |
 
  |}
 
  |}
 +
Action:
 +
* 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification.
 +
* 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
 +
* 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.
  
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
+
==== Respawn ====
 
 
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.
+
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 547: Line 833:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x09|0x0A}}
+
  |rowspan="10"| {{Change|0x3B|0x39}}
  |rowspan="1"| Play
+
  |rowspan="10"| Play
  |rowspan="1"| Server
+
  |rowspan="10"| Client
  | Slot
+
  | Dimension
  | Short
+
  | {{change|Int Enum|[[NBT|NBT Tag Compound]]}}
  | The slot which the player has selected (0–8)
+
  | {{change|-1: The Nether, 0: The Overworld, 1: The End|Valid dimensions are defined per dimension registry sent in [[#Join Game|Join Game]]}}
 +
|- {{Added}}
 +
| World Name
 +
| Identifier
 +
| Name of the world being spawned into
 +
|-
 +
| Hashed seed
 +
| Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 +
|- {{Added}}
 +
| Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 +
|- {{Added}}
 +
| Previous Gamemode
 +
| Unsigned Byte
 +
| 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
 +
|- {{Removed}}
 +
| Level Type
 +
| String (16)
 +
| Same as [[#Join Game|Join Game]]
 +
|- {{Added}}
 +
| Is Debug
 +
| Boolean
 +
| True if the world is a {{Minecraft Wiki|debug mode}} world; debug mode worlds cannot be modified and have predefined blocks
 +
|- {{Added}}
 +
| Is Flat
 +
| Boolean
 +
| True if the world is a {{Minecraft Wiki|superflat}} world; flat worlds have different void fog and a horizon at y=0 instead of y=63
 +
|- {{added}}
 +
| Copy metadata
 +
| Boolean
 +
| If false, metadata is reset on the respawned player entity.  Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
 
  |}
 
  |}
  
==== Animation ====
+
{{Need Info|Does the new World Name field resolve this same-dimension issue?}}
 +
 
 +
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
 +
 
 +
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
  
Sent when the player's arm swings
+
==== Multi Block Change ====
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 567: Line 889:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x0A|0x0B}}
+
  |rowspan="4"| {{Change|0x10|0x3B}}
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Server
+
  |rowspan="4"| Client
  |style="background-color: #d9ead3;"| Hand
+
  |
  |style="background-color: #d9ead3;"| Byte
+
| Long
  |style="background-color: #d9ead3;"| Hand used for the animation
+
| Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
 +
|- {{added}}
 +
|
 +
| Boolean
 +
| Always inverse the preceding Update Light packet's "Trust Edges" bool
 +
|
 +
  |-
 +
| Array size
 +
| VarInt
 +
| Number of elements in the following array
 +
  |-
 +
|
 +
| Array of VarLong
 +
| Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).
 
  |}
 
  |}
  
==== Entity Action ====
+
==== Entity Properties ====
  
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.
+
Sets {{Minecraft Wiki|Attribute|attributes}} on the given entity.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 583: Line 918:
 
  ! 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="6"| {{change|0x59|0x58}}
  |rowspan="3"| Play
+
  |rowspan="6"| Play
  |rowspan="3"| Server
+
  |rowspan="6"| Client
  | Entity ID
+
  |colspan="2"| Entity ID
  | VarInt
+
  |colspan="2"| VarInt
  | Player ID
+
  |  
 +
|-
 +
|colspan="2"| Number Of Properties
 +
|colspan="2"| Int
 +
| Number of elements in the following array
 +
|-
 +
|rowspan="4"| Property
 +
| Key
 +
|rowspan="4"| Array
 +
| {{Change|String (64)|Identifier}}
 +
| See below
 +
|-
 +
| Value
 +
| Double
 +
| See below
 
  |-
 
  |-
  | Action ID
+
  | Number Of Modifiers
 
  | VarInt
 
  | VarInt
  | The ID of the action, see below
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Jump Boost
+
  | Modifiers
  | VarInt
+
  | Array of Modifier Data
  | Horse jump boost. Ranged from 0 -> 100.
+
  | See {{Minecraft Wiki|Attribute#Modifiers}}. Modifier Data defined below.
 
  |}
 
  |}
  
Action ID can be one of the following values:
+
Known Key values (see also {{Minecraft Wiki|Attribute#Modifiers}}):
  
 
{| class="wikitable"
 
{| class="wikitable"
! ID
 
! Action
 
 
  |-
 
  |-
  | 0
+
! Key
  | Crouch
+
! Default
 +
! Min
 +
! Max
 +
! Label
 +
|-
 +
| {{change|generic.maxHealth|generic.max_health}}
 +
| 20.0
 +
| 0.0
 +
| 1024.0
 +
| Max Health
 +
|-
 +
| {{change|generic.followRange|generic.follow_range}}
 +
| 32.0
 +
| 0.0
 +
| 2048.0
 +
| Follow Range
 +
|-
 +
| {{change|generic.knockbackResistance|generic.knockback_resistance}}
 +
| 0.0
 +
| 0.0
 +
| 1.0
 +
| Knockback Resistance
 +
|-
 +
| {{change|generic.movementSpeed|generic.movement_speed}}
 +
| 0.7
 +
| 0.0
 +
| 1024.0
 +
| Movement Speed
 +
|-
 +
| {{change|generic.attackDamage|generic.attack_damage}}
 +
| 2.0
 +
| 0.0
 +
| 2048.0
 +
| Attack Damage
 +
|-
 +
| {{change|generic.attackSpeed|generic.attack_speed}}
 +
| 4.0
 +
| 0.0
 +
| 1024.0
 +
| Attack Speed
 +
|-
 +
| {{change|generic.flyingSpeed|generic.flying_speed}}
 +
| 0.4
 +
| 0.0
 +
| 1024.0
 +
| Flying Speed
 +
|-
 +
| generic.armor
 +
| 0.0
 +
| 0.0
 +
| 30.0
 +
| Armor
 +
|-
 +
| {{change|generic.armorToughness|generic.armor_toughness}}
 +
| 0.0
 +
| 0.0
 +
| 20.0
 +
| Armor Toughness
 +
|-
 +
| {{change|generic.attackKnockback|generic.attack_knockback}}
 +
| 0.0
 +
| 0.0
 +
  | 5.0
 +
  | &mdash;
 
  |-
 
  |-
  | 1
+
  | generic.luck
  | Uncrouch
+
  | 0.0
 +
| -1024.0
 +
| 1024.0
 +
| Luck
 
  |-
 
  |-
  | 2
+
| {{change|horse.jumpStrength|horse.jump_strength}}
  | Leave bed
+
| 0.7
 +
| 0.0
 +
  | 2.0
 +
  | Jump Strength
 
  |-
 
  |-
  | 3
+
  | {{change|zombie.spawnReinforcements|zombie.spawn_reinforcements}}
  | Start sprinting
+
| 0.0
 +
| 0.0
 +
| 1.0
 +
  | Spawn Reinforcements Chance
 
  |-
 
  |-
  | 4
+
  | generic.reachDistance
  | Stop sprinting
+
  | 5.0
 +
| 0.0
 +
| 1024.0
 +
| Player Reach Distance (Forge only)
 
  |-
 
  |-
  | 5
+
  | forge.swimSpeed
  | Jump with horse
+
  | 1.0
  |- style="background-color: #f4cccc; text-decoration: line-through;"
+
  | 0.0
  | 6
+
  | 1024.0
  | Open inventory
+
  | Swimming Speed (Forge only)
 
  |}
 
  |}
  
==== Steer Vehicle ====
+
Unknown attributes will cause a game crash ([https://bugs.mojang.com/browse/MC-150405 MC-150405]) due to the default minimum being larger than the default value.
 +
 
 +
''Modifier Data'' structure:
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  |-
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0C|0x0D}}
+
  | UUID
|rowspan="3"| Play
+
  | UUID
|rowspan="3"| Server
+
  |  
| Sideways
 
  | Float
 
  | Positive to the left of the player
 
 
  |-
 
  |-
  | Forward
+
  | Amount
  | Float
+
  | Double
  | Positive forward
+
  | May be positive or negative
 
  |-
 
  |-
  | Flags
+
  | Operation
  | Unsigned Byte
+
  | Byte
  | Bit mask. 0x1: jump, 0x2: unmount
+
  | See below
 
  |}
 
  |}
  
==== Close Window ====
+
The operation controls how the base value of the modifier is changed.
 
 
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 the inventory.
 
  
{| class="wikitable"
+
* 0: Add/subtract amount
! Packet ID
+
* 1: Add/subtract amount percent of the current value
! State
+
* 2: Multiply by amount percent
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| {{Change|0x0D|0x0E}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Window ID
 
| Unsigned Byte
 
| This is the ID of the window that was closed. 0 for inventory.
 
|}
 
  
==== Click Window ====
+
All of the 0's are applied first, and then the 1's, and then the 2's.
  
This packet is sent by the player when it clicks on a slot in a window.
+
==== Declare Recipes ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 687: Line 1,090:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x0E|0x0F}}
+
  |rowspan="4"| {{change|0x5B|0x5A}}
  |rowspan="6"| Play
+
  |rowspan="4"| Play
  |rowspan="6"| Server
+
  |rowspan="4"| Client
  | Window ID
+
  |colspan="2"| Num Recipes
  | Unsigned Byte
+
  |colspan="2"| VarInt
  | The ID of the window which was clicked. 0 for player inventory.
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Slot
+
  |rowspan="3"| Recipe
  | Short
+
| Recipe ID
  | The clicked slot number, see below
+
|rowspan="3"| Array
 +
  | Identifier
 +
  |
 
  |-
 
  |-
  | Button
+
  | Type
  | Byte
+
  | String
  | The button used in the click, see below
+
  | The recipe type, see below
 
  |-
 
  |-
  | Action Number
+
  | Data
  | Short
+
  | Optional, varies
  | A unique number for the action, implemented by Notchian as a counter, starting at 1. Used by the server to send back a [[Protocol#Confirm Transaction|Confirm Transaction]].
+
  | Additional data for the recipeFor some types, there will be no data.
|-
 
| 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]] for further information about how slots are indexed.
+
Recipe types:
 
 
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"
 
{| class="wikitable"
  ! Mode
+
  ! Type
  ! Button
+
  ! Description
  ! Slot
+
  ! Data
! Trigger
 
|-
 
!rowspan="2"| 0
 
| 0
 
| Normal
 
| Left mouse click
 
 
  |-
 
  |-
  | 1
+
  | <code>crafting_shapeless</code>
  | Normal
+
  | Shapeless crafting recipe.  All items in the ingredient list must be present, but in any order/slot.
  | Right mouse click
+
  | As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 +
    |-
 +
    | Ingredient count
 +
    | VarInt
 +
    | Number of elements in the following array
 +
    |-
 +
    | Ingredients
 +
    | Array of Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |-
 
  |-
  !rowspan="2"| 1
+
  | <code>crafting_shaped</code>
  | 0
+
| Shaped crafting recipe.  All items must be present in the same pattern (which may be flipped horizontally or translated)
  | Normal
+
| As follows:
| Shift + left mouse click
+
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Width
 +
    | VarInt
 +
    |
 +
    |-
 +
    | Height
 +
    | VarInt
 +
    |
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
 +
    |-
 +
    | Ingredients
 +
    | Array of Ingredient
 +
    | Length is width * height. Indexed by x + (y * width).
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |-
 
  |-
  | 1
+
  | <code>crafting_special_armordye</code>
  | Normal
+
  | Recipe for dying leather armor
  | Shift + right mouse click ''(identical behavior)''
+
  |rowspan="13"| None
 
  |-
 
  |-
  !rowspan="5"| 2
+
  | <code>crafting_special_bookcloning</code>
  | 0
+
  | Recipe for copying contents of written books
| Normal
 
| Number key 1
 
 
  |-
 
  |-
  | 1
+
  | <code>crafting_special_mapcloning</code>
  | Normal
+
  | Recipe for copying maps
| Number key 2
 
 
  |-
 
  |-
  | 2
+
  | <code>crafting_special_mapextending</code>
  | Normal
+
  | Recipe for adding paper to maps
| Number key 3
 
 
  |-
 
  |-
  |
+
  | <code>crafting_special_firework_rocket</code>
  |
+
  | Recipe for making firework rockets
| ⋮
 
 
  |-
 
  |-
  | 8
+
  | <code>crafting_special_firework_star</code>
  | Normal
+
  | Recipe for making firework stars
| Number key 9
 
 
  |-
 
  |-
  !rowspan="1"| 3
+
  | <code>crafting_special_firework_star_fade</code>
  | 2
+
  | Recipe for making firework stars fade between multiple colors
| Normal
 
| Middle click
 
 
  |-
 
  |-
  !rowspan="4"| 4
+
  | <code>crafting_special_repairitem</code>
  | 0
+
  | Recipe for repairing items via crafting
| Normal*
 
| Drop key (Q) (* Clicked item is different, see above)
 
 
  |-
 
  |-
  | 1
+
  | <code>crafting_special_tippedarrow</code>
  | Normal*
+
  | Recipe for crafting tipped arrows
| Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
 
 
  |-
 
  |-
  | 0
+
  | <code>crafting_special_bannerduplicate</code>
  | -999
+
  | Recipe for copying banner patterns
| Left click outside inventory holding nothing ''(no-op)''
 
 
  |-
 
  |-
  | 1
+
  | <code>crafting_special_banneraddpattern</code>
  | -999
+
  | Recipe for adding patterns to banners
| Right click outside inventory holding nothing ''(no-op)''
 
 
  |-
 
  |-
  !rowspan="6"| 5
+
  | <code>crafting_special_shielddecoration</code>
  | 0
+
  | Recipe for applying a banner's pattern to a shield
| -999
 
| Starting left mouse drag ''(or middle mouse)''
 
 
  |-
 
  |-
  | 4
+
  | <code>crafting_special_shulkerboxcoloring</code>
  | -999
+
  | Recipe for recoloring a shulker box
| Starting right mouse drag
 
 
  |-
 
  |-
  | 1
+
  | <code>smelting</code>
  | Normal
+
  | Smelting recipe
  | Add slot for left-mouse drag
+
  |rowspan="4"| As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book.
 +
    |-
 +
    | Ingredient
 +
    | Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |-
 +
    | Experience
 +
    | Float
 +
    |
 +
    |-
 +
    | Cooking time
 +
    | VarInt
 +
    |
 +
    |}
 
  |-
 
  |-
  | 5
+
  | <code>blasting</code>
  | Normal
+
  | Blast furnace recipe
| Add slot for right-mouse drag
 
 
  |-
 
  |-
  | 2
+
  | <code>smoking</code>
  | -999
+
  | Smoker recipe
| Ending left mouse drag
 
 
  |-
 
  |-
  | 6
+
  | <code>campfire_cooking</code>
  | -999
+
  | Campfire recipe
| Ending right mouse drag
 
 
  |-
 
  |-
  ! 6
+
  | <code>stonecutting</code>
  | 0
+
| Stonecutter recipe
  | Normal
+
| As follows:
  | Double click
+
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Group
 +
    | String
 +
    | Used to group similar recipes together in the recipe book.  Tag is present in recipe JSON.
 +
    |-
 +
    | Ingredient
 +
    | Ingredient
 +
    |
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 +
|- {{Added}}
 +
  | <code>smithing</code>
 +
  | Smithing table recipe
 +
  | As follows:
 +
  {| class="wikitable"
 +
    ! Name
 +
    ! Type
 +
    ! Description
 +
    |-
 +
    | Base
 +
    | Ingredient
 +
    | First item
 +
    |-
 +
    | Addition
 +
    | Ingredient
 +
    | Second item
 +
    |-
 +
    | Result
 +
    | [[Slot]]
 +
    |
 +
    |}
 
  |}
 
  |}
  
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):
+
Ingredient is defined as:
 
 
# 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|Confirm Transaction]]<!-- note that the anchor should be changed to #Confirm Transaction 2 when merging with [[Protocol]] --> 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 [[Protocol#Window Items|Window Items]] packet for the open window and [[Protocol#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.
 
 
 
==== Confirm Transaction ====
 
 
 
<SpaceManiac> noooo idea why the serverbound confirm transaction packet exists
 
<SpaceManiac> I think it's sent as a response to the clientbound confirm transaction in some situations, but it's fuzzy
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  ! Name
! State
+
  ! Type
! Bound To
+
  ! Description
! Field Name
 
  ! Field Type
 
  ! Notes
 
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x0F|0x10}}
+
  | Count
  |rowspan="3"| Play
+
  | VarInt
  |rowspan="3"| Server
+
  | Number of elements in the following array
| Window ID
 
| Byte
 
| The ID of the window that the action occurred in
 
 
  |-
 
  |-
  | Action Number
+
  | Items
  | Short
+
  | Array of [[Slot]]
  | Every action that is to be accepted has a unique number. This field corresponds to that number.
+
  | Any item in this array may be used for the recipe. The count of each item should be 1.
|-
 
| Accepted
 
| Boolean
 
| Whether the action was accepted
 
 
  |}
 
  |}
  
==== Creative Inventory Action ====
+
=== Serverbound ===
 +
 
 +
==== Interact Entity ====
  
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
+
This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).
  
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.
+
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.
  
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 2×2 crafting menu, even though they aren't visible in the vanilla client).
+
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 878: Line 1,332:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x10|0x11}}
+
  |rowspan="7"| 0x0E
  |rowspan="2"| Play
+
  |rowspan="7"| Play
  |rowspan="2"| Server
+
  |rowspan="7"| Server
  | Slot
+
  | Entity ID
  | Short
+
| VarInt
  | Inventory slot
+
| The ID of the entity to interact
 +
|-
 +
| Type
 +
| VarInt Enum
 +
| 0: interact, 1: attack, 2: interact at
 +
|-
 +
| Target X
 +
  | Optional Float
 +
  | Only if Type is interact at
 
  |-
 
  |-
  | Clicked Item
+
  | Target Y
| [[Slot Data|Slot]]
+
  | Optional Float
  |  
+
  | Only if Type is interact at
  |}
 
 
 
==== Enchant Item ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x11|0x12}}
+
  | Target Z
|rowspan="2"| Play
+
  | Optional Float
  |rowspan="2"| Server
+
  | Only if Type is interact at
  | Window ID
 
| Byte
 
| The ID of the enchantment table window sent by [[Protocol#Open Window|Open Window]]
 
 
  |-
 
  |-
  | Enchantment
+
  | Hand
  | Byte
+
  | Optional VarInt Enum
  | The position of the enchantment on the enchantment table window, starting with 0 as the topmost one
+
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
 +
|- {{Added}}
 +
| Sneaking
 +
| Boolean
 +
| If the client is sneaking.
 
  |}
 
  |}
  
==== Update Sign ====
+
==== Generate Structure ====
  
This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
+
Sent when Generate is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
  
{| class="wikitable"
+
{| class="wikitable" {{added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 924: Line 1,376:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="5"| {{Change|0x12|0x13}}
+
  |rowspan="3"| 0x0F
  |rowspan="5"| Play
+
  |rowspan="3"| Play
  |rowspan="5"| Server
+
  |rowspan="3"| Server
 
  | Location
 
  | Location
 
  | Position
 
  | Position
  | Block Coordinates
+
  | Block entity location
 
  |-
 
  |-
  | Line 1
+
  | Levels
  | [[Chat]]
+
  | VarInt
  | First line of text in the sign
+
  | Value of the levels slider/max depth to generate
 
  |-
 
  |-
  | Line 2
+
  | Keep Jigsaws
  | [[Chat]]
+
  | Boolean
  | Second line of text in the sign
+
  |
|-
 
| Line 3
 
| [[Chat]]
 
| Third line of text in the sign
 
|-
 
| Line 4
 
| [[Chat]]
 
| Fourth line of text in the sign
 
 
  |}
 
  |}
  
==== Player Abilities ====
+
==== Player Abilities (serverbound) ====
  
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.
+
{{change|The latter 2 fields are used to indicate the walking and flying speeds respectively, while the first field is used to determine the value of 4 booleans.}}
  
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.
+
The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. {{change|All other parameters are ignored by the vanilla server.}}
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 962: Line 1,406:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x13|0x14}}
+
  |rowspan="3"| {{change|0x19|0x1A}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Server
 
  |rowspan="3"| Server
 
  | Flags
 
  | Flags
 
  | Byte
 
  | Byte
  | Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
+
  | Bit mask. {{change|0x08: damage disabled (god mode), 0x04: can fly, }}0x02: is flying{{change|, 0x01: is Creative}}
  |-
+
  |- {{removed}}
 
  | Flying Speed
 
  | Flying Speed
 
  | Float
 
  | Float
 
  |  
 
  |  
  |-
+
  |- {{removed}}
 
  | Walking Speed
 
  | Walking Speed
 
  | Float
 
  | Float
Line 978: Line 1,422:
 
  |}
 
  |}
  
==== Tab-Complete ====
+
==== Set Displayed Recipe ====
  
Sent when the user presses ''tab'' while writing text.
+
Replaces Recipe Book Data, type 0.
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 990: Line 1,434:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x14|0x15}}
+
  |rowspan="1"| 0x1E
  |rowspan="3"| Play
+
  |rowspan="1"| Play
  |rowspan="3"| Server
+
  |rowspan="1"| Server
  | Text
+
  | Recipe ID
| String
+
  | Identifier
| 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 ====
+
==== Set Recipe Book State ====
  
Sent when the player connects, or when settings are changed.
+
Replaces Recipe Book Data, type 1.
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,018: Line 1,454:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x15|0x16}}
+
  |rowspan="3"| 0x1F
  |rowspan="6"| Play
+
  |rowspan="3"| Play
  |rowspan="6"| Server
+
  |rowspan="3"| Server
  | Locale
+
  | Book ID
  | String
+
  | VarInt enum
  | e.g. en_GB
+
  | 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
 
  |-
 
  |-
  | View Distance
+
  | Book Open
  | Byte
+
  | Boolean
  | Client-side render distance, in chunks
+
  |
|-
 
| Chat Mode
 
| {{Change|Byte|VarInt}}
 
| 0: enabled, 1: commands only, 2: hidden
 
 
  |-
 
  |-
  | Chat Colors
+
  | Filter Active
 
  | Boolean
 
  | Boolean
  | “Colors” multiplayer setting
+
  |
|-
 
| Displayed Skin Parts
 
| Unsigned Byte
 
| Skin parts, see note below
 
|- style="background-color: #d9ead3;"
 
| Main Hand
 
| VarInt
 
| 0: Left, 1: Right
 
 
  |}
 
  |}
  
''Displayed Skin Parts'' flags:
+
==== Update Jigsaw Block ====
 
 
* 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.
+
Sent when Done is pressed on the {{Minecraft Wiki|Jigsaw Block}} interface.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,070: Line 1,482:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x16|0x17}}
+
  |rowspan="7"| {{Change|0x27|0x28}}
  |rowspan="1"| Play
+
  |rowspan="7"| Play
  |rowspan="1"| Server
+
  |rowspan="7"| Server
  | Action ID
+
  | Location
  | VarInt
+
  | Position
  | See below
+
  | Block entity location
 +
|- {{Removed}}
 +
| Attachment type
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Name
 +
| Identifier
 +
|
 +
|- {{Added}}
 +
| Target
 +
| Identifier
 +
|
 +
|-
 +
| {{Change|Target pool|Pool}}
 +
| Identifier
 +
|
 +
|-
 +
| Final state
 +
| String
 +
| "Turns into" on the GUI, <code>final_state</code> in NBT
 +
|- {{Added}}
 +
| Joint type
 +
| String
 +
| <code>rollable</code> if the attached piece can be rotated, else <code>aligned</code>
 
  |}
 
  |}
  
''Action ID'' values:
+
==== Entity Equipment ====
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
!colspan="2"| Field Name
 +
!colspan="2"| Field Type
 +
! Notes
 
  |-
 
  |-
  ! Action ID
+
  |rowspan="5"| 0x47
  ! Action
+
|rowspan="5"| Play
 +
|rowspan="5"| Client
 +
|colspan="2"| Entity ID
 +
  |colspan="2"| VarInt
 +
| Entity's EID
 +
|- {{Removed}}
 +
|colspan="2"| Slot
 +
|colspan="2"| VarInt Enum
 +
| Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
 +
|- {{Removed}}
 +
|colspan="2"| Item
 +
|colspan="2"| [[Slot Data|Slot]]
 +
|
 
  |-
 
  |-
  | 0
+
  |rowspan="2"| Equipment
  | Perform respawn
+
| Slot
 +
|rowspan="2"| Array
 +
| Byte Enum
 +
  | Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet).  Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
 
  |-
 
  |-
  | 1
+
  | Item
  | Request stats
+
  | [[Slot Data|Slot]]
|-
+
  |
  | 2
 
| {{Change|''Taking Inventory'' achievement|Open Inventory}}
 
 
  |}
 
  |}
  
==== Plugin Message ====
+
== Handshaking ==
  
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>.
+
=== Clientbound ===
  
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/]
+
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.  
  
Note that the data length is known from the packet length, so there is no need for a length member being sent.
+
=== Serverbound ===
  
{| class="wikitable"
+
==== Handshake ====
! 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]].
 
|}
 
  
==== Spectate ====
+
This causes the server to switch into the target state.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,133: Line 1,570:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| {{Change|0x18|0x19}}
+
  |rowspan="4"| 0x00
  |rowspan="1"| Play
+
  |rowspan="4"| Handshaking
  |rowspan="1"| Server
+
  |rowspan="4"| Server
  | Target Player
+
  | Protocol Version
  | UUID
+
  | VarInt
  |  
+
  | See [[protocol version numbers]] (currently {{change|578|753}})
|}
 
 
 
==== Resource Pack Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x19|0x1A}}
+
  | Server Address
|rowspan="2"| Play
 
|rowspan="2"| Server
 
| Hash
 
 
  | String
 
  | String
  | The hash sent in the [[Protocol#Resource Pack Send|Resource Pack Send]] packet.
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 +
|-
 +
| Server Port
 +
| Unsigned Short
 +
| Default is 25565.  The Notchian server does not use this information.
 
  |-
 
  |-
  | Result
+
  | Next State
  | VarInt
+
  | VarInt Enum
  | 0: successfully loaded, 1: declined, 2: failed download, 3: accepted
+
  | 1 for [[#Status|status]], 2 for [[#Login|login]]
 
  |}
 
  |}
  
Line 1,177: Line 1,604:
 
=== Clientbound ===
 
=== Clientbound ===
  
No changes so far.
+
==== Login Success ====
 +
 
 +
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 +
! Field Name
 +
! Field Type
 +
! Notes
 +
|-
 +
|rowspan="2"| 0x02
 +
|rowspan="2"| Login
 +
|rowspan="2"| Client
 +
| UUID
 +
| {{Change|String (36)|UUID}}
 +
| {{Change|Unlike in other packets, this field contains the UUID as a string with hyphens}}.
 +
|-
 +
| Username
 +
| String (16)
 +
|
 +
|}
 +
 
 +
This packet switches the connection state to [[#Play|play]].
  
 
=== Serverbound ===
 
=== Serverbound ===
  
 
No changes so far.
 
No changes so far.
 +
 +
 +
[[Category:Minecraft Modern]]

Latest revision as of 17:11, 10 September 2020

This page documents the changes from the last stable Minecraft release (currently 1.15.2, protocol 578) to the current pre-release (currently 1.16.3, protocol 753). 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

The UUID type is now also sometimes encoded by the Notchian server as an array of four 32-bit integers, from most significant to least significant (matching the new format used on entity NBT). This representation is identical to using 16 bytes, two 64-bit integers, or one 128-bit integers.

Packets

ID Packet name Documentation
Handshaking serverbound
0x00 Handshake Current Pre
Play clientbound
0x02 Spawn Weather Entity Current
0x03 0x02 Spawn Living Entity Current (unchanged)
0x04 0x03 Spawn Painting Current (unchanged)
0x05 0x04 Spawn Player Current (unchanged)
0x06 0x05 Entity Animation (clientbound) Current (unchanged)
0x07 0x06 Statistics Current (unchanged)
0x08 0x07 Acknowledge Player Digging Current (unchanged)
0x09 0x08 Block Break Animation Current (unchanged)
0x0A 0x09 Block Entity Data Current (unchanged)
0x0B 0x0A Block Action Current (unchanged)
0x0C 0x0B Block Change Current (unchanged)
0x0D 0x0C Boss Bar Current (unchanged)
0x0E 0x0D Server Difficulty Current (unchanged)
0x0F 0x0E Chat Message (clientbound) Current Pre
0x11 0x0F Tab-Complete (clientbound) Current (unchanged)
0x12 0x10 Declare Commands Current (unchanged)
0x13 0x11 Window Confirmation (clientbound) Current (unchanged)
0x14 0x12 Close Window (clientbound) Current (unchanged)
0x15 0x13 Window Items Current (unchanged)
0x16 0x14 Window Property Current (unchanged)
0x17 0x15 Set Slot Current (unchanged)
0x18 0x16 Set Cooldown Current (unchanged)
0x19 0x17 Plugin Message (clientbound) Current (unchanged)
0x1A 0x18 Named Sound Effect Current (unchanged)
0x1B 0x19 Disconnect (play) Current (unchanged)
0x1C 0x1A Entity Status Current (unchanged)
0x1D 0x1B Explosion Current (unchanged)
0x1E 0x1C Unload Chunk Current (unchanged)
0x1F 0x1D Change Game State Current (unchanged)
0x20 0x1E Open Horse Window Current (unchanged)
0x21 0x1F Keep Alive (clientbound) Current (unchanged)
0x22 0x20 Chunk Data Current Pre
0x23 0x21 Effect Current (unchanged)
0x24 0x22 Particle Current (unchanged)
0x25 0x23 Update Light Current Pre
0x26 0x24 Join Game Current Pre
0x27 0x25 Map Data Current (unchanged)
0x28 0x26 Trade List Current (unchanged)
0x29 0x27 Entity Position Current (unchanged)
0x2A 0x28 Entity Position and Rotation Current (unchanged)
0x2B 0x29 Entity Rotation Current (unchanged)
0x2C 0x2A Entity Movement Current (unchanged)
0x2D 0x2B Vehicle Move (clientbound) Current (unchanged)
0x2E 0x2C Open Book Current (unchanged)
0x2F 0x2D Open Window Current (unchanged)
0x30 0x2E Open Sign Editor Current (unchanged)
0x31 0x2F Craft Recipe Response Current (unchanged)
0x32 0x30 Player Abilities (clientbound) Current (unchanged)
0x33 0x31 Combat Event Current (unchanged)
0x34 0x32 Player Info Current (unchanged)
0x35 0x33 Face Player Current (unchanged)
0x36 0x34 Player Position And Look (clientbound) Current (unchanged)
0x37 0x35 Unlock Recipes Current Pre
0x38 0x36 Destroy Entities Current (unchanged)
0x39 0x37 Remove Entity Effect Current (unchanged)
0x3A 0x38 Resource Pack Send Current (unchanged)
0x3B 0x39 Respawn Current Pre
0x3C 0x3A Entity Head Look Current (unchanged)
0x10 0x3B Multi Block Change Current Pre
0x3D 0x3C Select Advancement Tab Current (unchanged)
0x3E 0x3D World Border Current (unchanged)
0x3F 0x3E Camera Current (unchanged)
0x40 0x3F Held Item Change (clientbound) Current (unchanged)
0x41 0x40 Update View Position Current (unchanged)
0x42 0x41 Update View Distance Current (unchanged)
0x47 Entity Equipment Current Pre
0x4E 0x42 Spawn Position Current (unchanged)
0x4F 0x4E Time Update Current (unchanged)
0x50 0x4F Title Current (unchanged)
0x51 0x50 Entity Sound Effect Current (unchanged)
0x52 0x51 Sound Effect Current (unchanged)
0x53 0x52 Stop Sound Current (unchanged)
0x54 0x53 Player List Header And Footer Current (unchanged)
0x55 0x54 NBT Query Response Current (unchanged)
0x56 0x55 Collect Item Current (unchanged)
0x57 0x56 Entity Teleport Current (unchanged)
0x58 0x57 Advancements Current (unchanged)
0x59 0x58 Entity Properties Current Pre
0x5A 0x59 Entity Effect Current (unchanged)
0x5B 0x5A Declare Recipes Current Pre
0x5C 0x5B Tags Current (unchanged)
Play serverbound
0x0E Interact Entity Current Pre
0x0F Generate Structure Pre
0x0F 0x10 Keep Alive (serverbound) Current (unchanged)
0x10 0x11 Lock Difficulty Current (unchanged)
0x11 0x12 Player Position Current (unchanged)
0x12 0x13 Player Position And Rotation (serverbound) Current (unchanged)
0x13 0x14 Player Rotation Current (unchanged)
0x14 0x15 Player Movement Current (unchanged)
0x15 0x16 Vehicle Move (serverbound) Current (unchanged)
0x16 0x17 Steer Boat Current (unchanged)
0x17 0x18 Pick Item Current (unchanged)
0x18 0x19 Craft Recipe Request Current (unchanged)
0x19 0x1A Player Abilities (serverbound) Current Pre
0x1A 0x1B Player Digging Current (unchanged)
0x1B 0x1C Entity Action Current (unchanged)
0x1C 0x1D Steer Vehicle Current (unchanged)
0x1D Recipe Book Data Current
0x1E Set Displayed Recipe Pre
0x1F Set Recipe Book State Pre
0x1E 0x20 Name Item Current (unchanged)
0x1F 0x21 Resource Pack Status Current (unchanged)
0x20 0x22 Advancement Tab Current (unchanged)
0x21 0x23 Select Trade Current (unchanged)
0x22 0x24 Set Beacon Effect Current (unchanged)
0x23 0x25 Held Item Change (serverbound) Current (unchanged)
0x24 0x26 Update Command Block Current (unchanged)
0x25 0x27 Update Command Block Minecart Current (unchanged)
0x26 0x28 Creative Inventory Action Current (unchanged)
0x27 0x29 Update Jigsaw Block Current Pre
0x28 0x2A Update Structure Block Current (unchanged)
0x29 0x2B Update Sign Current (unchanged)
0x2A 0x2C Animation (serverbound) Current (unchanged)
0x2B 0x2D Spectate Current (unchanged)
0x2C 0x2E Player Block Placement Current (unchanged)
0x2D 0x2F Use Item Current (unchanged)
Login clientbound
0x02 Login Success Current Pre

New/modified data types

No changes so far.

Entity Metadata

FishingHook

Extends Entity.

Index Type Meaning Default
7 VarInt Hooked entity id + 1, or 0 if there is no hooked entity 0
8 Boolean Is catchable False

Abstract Arrow

Extends Entity.

Abstract base class for Tipped Arrow (which is used for regular arrows as well as tipped ones) and Spectral Arrow.

Index Type Meaning Default
7 Byte Bit mask Meaning 0
0x01 Is critical
0x02 Is noclip (used by loyalty tridents when returning)
8 OptUUID Unused Empty
9 8 Byte Peircing level 0

Tipped Arrow

Extends Abstract Arrow.

Used for both tipped and regular arrows. If not tipped, then color is set to -1 and no tipped arrow particles are used.

Index Type Meaning Default
10 9 VarInt Color (-1 for no particles) -1

Spectral Arrow

Extends Abstract Arrow.

No additional metadata.

Trident

Extends Abstract Arrow.

Index Type Meaning Default
10 9 VarInt Loyalty level (enchantment) 0
11 10 Boolean Has enchantment glint False

Strider

Extends Animal.

Index Type Meaning Default
16 VarInt Total time to "boost" with warped fungus on a stick for 0
17 Boolean Is shaking (true unless riding a vehicle or on or in a block tagged with strider_warm_blocks (default: lava)) false
18 Boolean Has saddle false

Hoglin

Extends Animal.

Index Type Meaning Default
16 Boolean Is immune to zombification false

Zoglin

Extends Monster.

Index Type Meaning Default
15 Boolean Is baby false

Base Piglin

Extends Monster.

Index Type Meaning Default
15 Boolean Is immune to zombification false

Piglin

Extends Base Piglin.

Index Type Meaning Default
16 Boolean Is baby false
17 Boolean Is charging crossbow false
18 Boolean Is dancing false

Piglin Brute

Extends Base Piglin.

No additional metadata.

Wolf

Extends TameableAnimal.

Index Type Meaning Default
18 Boolean Is begging false
19 VarInt Collar color (values are those used with dyes) 14 (Red)
20 VarInt Anger time 0

Zombie Pigman Zombified Piglin

Extends Zombie.

No additional metadata.

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

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.

Warning.png Game info accepts json formatting but does not display it, although the deprecated §-based formatting works. This is not an issue when using the Title packet, so prefer that packet for displaying information in that slot. See MC-119145 for more information.

Packet ID State Bound To Field Name Field Type Notes
0x0F 0x0E Play Client JSON Data Chat Limited to 32767 bytes
Position Byte 0: chat (chat box), 1: system message (chat box), 2: game info (above hotbar).
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.

Chunk Data

Main article: Chunk Format
See also: #Unload Chunk
Huh.png The following information needs to be added to this page:
How do biomes work now? The biome change happened at the same time as the seed change, but it's not clear how/if biomes could be computed given that it's not the actual seed... (/r/mojira discussion which notes that it seems to be some kind of interpolation, and 3D biomes are only used in the nether)

The server only sends skylight information for chunk pillars in the Overworld, it's up to the client to know in which dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent. This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with Update Block Entity later).

Packet ID State Bound To Field Name Field Type Notes
0x22 0x20 Play Client Chunk X Int Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z Int Chunk coordinate (block coordinate divided by 16, rounded down)
Full chunk Boolean See Chunk Format
Primary Bit Mask VarInt Bitmask with bits set to 1 for every 16×16×16 chunk section whose data is included in Data. The least significant bit represents the chunk section at the bottom of the chunk column (from y=0 to y=15).
Heightmaps NBT Compound containing one long array named MOTION_BLOCKING, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a WORLD_SURFACE long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
Biomes length Optional VarInt Size of the following array. Not present if full chunk is false.
Biomes Optional array of Integer VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Possibly something else. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

Note that the Notchian client requires an Update View Position packet when it crosses a chunk border, otherwise it'll only display render distance + 2 chunks around the chunk it spawned in.

The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.

New format, 5 bits per block, containing the following references to blocks in a palette (not shown): 122344566480743131516914101202

0020863148418841 0000000000100000100001100011000101001000010000011000100001000001
01018A7260F68C87 0000000100000001100010100111001001100000111101101000110010000111

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x23 Play Client Chunk X VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Chunk Z VarInt Chunk coordinate (block coordinate divided by 16, rounded down)
Trust Edges Boolean If edges should be trusted for light updates.
Sky Light Mask VarInt Mask containing 18 bits, with the lowest bit corresponding to chunk section -1 (in the void, y=-16 to y=-1) and the highest bit for chunk section 16 (above the world, y=256 to y=271)
Block Light Mask VarInt Mask containing 18 bits, with the same order as sky light
Empty Sky Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their sky light values. If a section is set in both this mask and the main sky light mask, it is ignored for this mask and it is included in the sky light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the sky light arrays.
Empty Block Light Mask VarInt Mask containing 18 bits, which indicates sections that have 0 for all their block light values. If a section is set in both this mask and the main block light mask, it is ignored for this mask and it is included in the block light arrays (the notchian server does not create such masks). If it is only set in this mask, it is not included in the block light arrays.
Sky Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Sky Light array Array of 2048 bytes There is 1 array for each bit set to true in the sky light mask, starting with the lowest value. Half a byte per light value.
Block Light arrays Length Array VarInt Length of the following array in bytes (always 2048)
Block Light array Array of 2048 bytes There is 1 array for each bit set to true in the block light mask, starting with the lowest value. Half a byte per light value.

Individual block or sky light arrays are is given for each block with increasing x coordinates, within rows of increasing z coordinates, within layers of increasing y coordinates. Even-indexed items (those with an even x coordinate, starting at 0) are packed into the low bits, odd-indexed into the high bits.

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x26 0x24 Play Client Entity ID Int The player's Entity ID (EID)
Is hardcore Boolean
Gamemode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
Previous Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
World Count VarInt Size of the following array
World Names Array of Identifier Identifiers for all worlds on the server
Dimension Codec NBT Tag Compound The full extent of these is still unknown, but the tag represents a dimension and biome registry. See below for the vanilla default.
Dimension Int Enum NBT Tag Compound -1: The Nether, 0: The Overworld, 1: The End Valid dimensions are defined per dimension registry sent before this
World Name Identifier Name of the world being spawned into
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Max Players Unsigned Byte VarInt Was once used by the client to draw the player list, but now is ignored
Level Type String Enum (16) default, flat, largeBiomes, amplified, customized, buffet, default_1_1
View Distance VarInt Render distance (2-32)
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
Enable respawn screen Boolean Set to false when the doImmediateRespawn gamerule is true
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63
Huh.png The following information needs to be added to this page:
Lay out and explain the format

Default Vanilla Dimension/Biome Codec

Known dimension attributes:

Name Type Meaning Values
name String Dimension's name "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
piglin_safe Byte Whether piglins shake and transform to zombified piglins. 1: true, 0: false
natural Byte When false, compasses spin randomly. When true, nether portals can spawn zombified piglins. 1: true, 0: false
ambient_light Float How much light the dimension has. 0.0 to 1.0
fixed_time Long If this is set to a number, the time of the day is the specified value. false, or 0 to 24000
infiniburn String A resource location defining what block tag to use for infiniburn. "" or minecraft resource "minecraft:..."
respawn_anchor_works Byte Whether players can charge and use respawn anchors. 1: true, 0: false
has_skylight Byte Whether the dimension has skylight access or not. 1: true, 0: false
bed_works Byte Whether players can use a bed to sleep. 1: true, 0: false
effects String ? "minecraft:overworld", "minecraft:the_nether", "minecraft:the_end" or something else
has_raids Byte Whether players with the Bad Omen effect can cause a raid. 1: true, 0: false
logical_height Int The maximum height to which chorus fruits and nether portals can bring players within this dimension. 0-256
coordinate_scale Float The multiplier applied to coordinates when traveling to the dimension. 1: true, 0: false
ultrawarm Byte Whether the dimensions behaves like the nether (water evaporates and sponges dry) or not. Also causes lava to spread thinner. 1: true, 0: false
has_ceiling Byte Whether the dimension has a bedrock ceiling or not. When true, causes lava to spread faster. 1: true, 0: false

Unlock Recipes

Packet ID State Bound To Field Name Field Type Notes
0x37 0x35 Play Client
Action VarInt 0: init, 1: add, 2: remove
Crafting Recipe Book Open Boolean If true, then the crafting recipe book will be open when the player opens its inventory.
Crafting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smelting Recipe Book Open Boolean If true, then the smelting recipe book will be open when the player opens its inventory.
Smelting Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Blast Furance Recipe Book Open Boolean If true, then the blast furnace recipe book will be open when the player opens its inventory.
Blast Furance Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Smoker Recipe Book Open Boolean If true, then the smoker recipe book will be open when the player opens its inventory.
Smoker Recipe Book Filter Active Boolean If true, then the filtering option is active when the players opens its inventory.
Array size 1 VarInt Number of elements in the following array
Recipe IDs Array of Identifier
Array size 2 Optional VarInt Number of elements in the following array, only present if mode is 0 (init)
Recipe IDs Optional Array of Identifier, only present if mode is 0 (init)

Action:

  • 0 (init) = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed, recipes that aren't tagged will be shown in the notification.
  • 1 (add) = All the recipes in the list are added and their icon will be shown in the notification.
  • 2 (remove) = Remove all the recipes in the list. This allows them to re-displayed when they are readded.

Respawn

To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.

Packet ID State Bound To Field Name Field Type Notes
0x3B 0x39 Play Client Dimension Int Enum NBT Tag Compound -1: The Nether, 0: The Overworld, 1: The End Valid dimensions are defined per dimension registry sent in Join Game
World Name Identifier Name of the world being spawned into
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
Previous Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included. The previous gamemode. (More information needed)
Level Type String (16) Same as Join Game
Is Debug Boolean True if the world is a debug mode world; debug mode worlds cannot be modified and have predefined blocks
Is Flat Boolean True if the world is a superflat world; flat worlds have different void fog and a horizon at y=0 instead of y=63
Copy metadata Boolean If false, metadata is reset on the respawned player entity. Set to true for dimension changes (including the dimension change triggered by sending client status perform respawn to exit the end poem/credits), and false for normal respawns.
Huh.png The following information needs to be added to this page:
Does the new World Name field resolve this same-dimension issue?

Warning.png Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).

If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.

Multi Block Change

Packet ID State Bound To Field Name Field Type Notes
0x10 0x3B Play Client Long Chunk section coordinate (encoded chunk x and z with each 22 bits, and section y with 20 bits, from left to right)
Boolean Always inverse the preceding Update Light packet's "Trust Edges" bool
Array size VarInt Number of elements in the following array
Array of VarLong Each entry is composed of the block id, shifted right by 12, and the relative block position in the chunk section (4 bits for x, z, and y, from left to right).

Entity Properties

Sets attributes on the given entity.

Packet ID State Bound To Field Name Field Type Notes
0x59 0x58 Play Client Entity ID VarInt
Number Of Properties Int Number of elements in the following array
Property Key Array String (64) Identifier See below
Value Double See below
Number Of Modifiers VarInt Number of elements in the following array
Modifiers Array of Modifier Data See Attribute#Modifiers. Modifier Data defined below.

Known Key values (see also Attribute#Modifiers):

Key Default Min Max Label
generic.maxHealth generic.max_health 20.0 0.0 1024.0 Max Health
generic.followRange generic.follow_range 32.0 0.0 2048.0 Follow Range
generic.knockbackResistance generic.knockback_resistance 0.0 0.0 1.0 Knockback Resistance
generic.movementSpeed generic.movement_speed 0.7 0.0 1024.0 Movement Speed
generic.attackDamage generic.attack_damage 2.0 0.0 2048.0 Attack Damage
generic.attackSpeed generic.attack_speed 4.0 0.0 1024.0 Attack Speed
generic.flyingSpeed generic.flying_speed 0.4 0.0 1024.0 Flying Speed
generic.armor 0.0 0.0 30.0 Armor
generic.armorToughness generic.armor_toughness 0.0 0.0 20.0 Armor Toughness
generic.attackKnockback generic.attack_knockback 0.0 0.0 5.0
generic.luck 0.0 -1024.0 1024.0 Luck
horse.jumpStrength horse.jump_strength 0.7 0.0 2.0 Jump Strength
zombie.spawnReinforcements zombie.spawn_reinforcements 0.0 0.0 1.0 Spawn Reinforcements Chance
generic.reachDistance 5.0 0.0 1024.0 Player Reach Distance (Forge only)
forge.swimSpeed 1.0 0.0 1024.0 Swimming Speed (Forge only)

Unknown attributes will cause a game crash (MC-150405) due to the default minimum being larger than the default value.

Modifier Data structure:

Field Name Field Type Notes
UUID UUID
Amount Double May be positive or negative
Operation Byte See below

The operation controls how the base value of the modifier is changed.

  • 0: Add/subtract amount
  • 1: Add/subtract amount percent of the current value
  • 2: Multiply by amount percent

All of the 0's are applied first, and then the 1's, and then the 2's.

Declare Recipes

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x5A Play Client Num Recipes VarInt Number of elements in the following array
Recipe Recipe ID Array Identifier
Type String The recipe type, see below
Data Optional, varies Additional data for the recipe. For some types, there will be no data.

Recipe types:

Type Description Data
crafting_shapeless Shapeless crafting recipe. All items in the ingredient list must be present, but in any order/slot. As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredient count VarInt Number of elements in the following array
Ingredients Array of Ingredient
Result Slot
crafting_shaped Shaped crafting recipe. All items must be present in the same pattern (which may be flipped horizontally or translated) As follows:
Name Type Description
Width VarInt
Height VarInt
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredients Array of Ingredient Length is width * height. Indexed by x + (y * width).
Result Slot
crafting_special_armordye Recipe for dying leather armor None
crafting_special_bookcloning Recipe for copying contents of written books
crafting_special_mapcloning Recipe for copying maps
crafting_special_mapextending Recipe for adding paper to maps
crafting_special_firework_rocket Recipe for making firework rockets
crafting_special_firework_star Recipe for making firework stars
crafting_special_firework_star_fade Recipe for making firework stars fade between multiple colors
crafting_special_repairitem Recipe for repairing items via crafting
crafting_special_tippedarrow Recipe for crafting tipped arrows
crafting_special_bannerduplicate Recipe for copying banner patterns
crafting_special_banneraddpattern Recipe for adding patterns to banners
crafting_special_shielddecoration Recipe for applying a banner's pattern to a shield
crafting_special_shulkerboxcoloring Recipe for recoloring a shulker box
smelting Smelting recipe As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book.
Ingredient Ingredient
Result Slot
Experience Float
Cooking time VarInt
blasting Blast furnace recipe
smoking Smoker recipe
campfire_cooking Campfire recipe
stonecutting Stonecutter recipe As follows:
Name Type Description
Group String Used to group similar recipes together in the recipe book. Tag is present in recipe JSON.
Ingredient Ingredient
Result Slot
smithing Smithing table recipe As follows:
Name Type Description
Base Ingredient First item
Addition Ingredient Second item
Result Slot

Ingredient is defined as:

Name Type Description
Count VarInt Number of elements in the following array
Items Array of Slot Any item in this array may be used for the recipe. The count of each item should be 1.

Serverbound

Interact Entity

This packet is sent from the client to the server when the client attacks or right-clicks another entity (a player, minecart, etc).

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.

Note that middle-click in creative mode is interpreted by the client and sent as a Creative Inventory Action packet instead.

Packet ID State Bound To Field Name Field Type Notes
0x0E Play Server Entity ID VarInt The ID of the entity to interact
Type VarInt Enum 0: interact, 1: attack, 2: interact at
Target X Optional Float 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 VarInt Enum Only if Type is interact or interact at; 0: main hand, 1: off hand
Sneaking Boolean If the client is sneaking.

Generate Structure

Sent when Generate is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x0F Play Server Location Position Block entity location
Levels VarInt Value of the levels slider/max depth to generate
Keep Jigsaws Boolean

Player Abilities (serverbound)

The latter 2 fields are used to indicate the walking and flying speeds respectively, while the first field is used to determine the value of 4 booleans.

The vanilla client sends this packet when the player starts/stops flying with the Flags parameter changed accordingly. All other parameters are ignored by the vanilla server.

Packet ID State Bound To Field Name Field Type Notes
0x19 0x1A Play Server Flags Byte Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
Flying Speed Float
Walking Speed Float

Set Displayed Recipe

Replaces Recipe Book Data, type 0.

Packet ID State Bound To Field Name Field Type Notes
0x1E Play Server Recipe ID Identifier

Set Recipe Book State

Replaces Recipe Book Data, type 1.

Packet ID State Bound To Field Name Field Type Notes
0x1F Play Server Book ID VarInt enum 0: crafting, 1: furnace, 2: blast furnace, 3: smoker
Book Open Boolean
Filter Active Boolean

Update Jigsaw Block

Sent when Done is pressed on the Jigsaw Block interface.

Packet ID State Bound To Field Name Field Type Notes
0x27 0x28 Play Server Location Position Block entity location
Attachment type Identifier
Name Identifier
Target Identifier
Target pool Pool Identifier
Final state String "Turns into" on the GUI, final_state in NBT
Joint type String rollable if the attached piece can be rotated, else aligned

Entity Equipment

Packet ID State Bound To Field Name Field Type Notes
0x47 Play Client Entity ID VarInt Entity's EID
Slot VarInt Enum Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
Item Slot
Equipment Slot Array Byte Enum Equipment slot. 0: main hand, 1: off hand, 2–5: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet). Also has the top bit set if another entry follows, and otherwise unset if this is the last item in the array.
Item Slot

Handshaking

Clientbound

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.

Serverbound

Handshake

This causes the server to switch into the target state.

Packet ID State Bound To Field Name Field Type Notes
0x00 Handshaking Server Protocol Version VarInt See protocol version numbers (currently 578 753)
Server Address String Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

Login Success

Packet ID State Bound To Field Name Field Type Notes
0x02 Login Client UUID String (36) UUID Unlike in other packets, this field contains the UUID as a string with hyphens.
Username String (16)

This packet switches the connection state to play.

Serverbound

No changes so far.