Difference between revisions of "Pre-release protocol"

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(→‎Maps: added notes to Scale field)
(remove 'in 1.17', it's probably redundant)
 
Line 1: Line 1:
This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.8.8, protocol 47]]) to the current pre-release (currently [[Protocol version numbers|15w35b, protocol 63]]). 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|1.16.5, protocol 754]]) to the current pre-release (currently [[Protocol version numbers|21w07a, protocol {{Snapshot PVN|1073741839}}]]). 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.
  
== New/modified data types ==
+
== Contents ==
  
=== Entity Metadata ===
+
<div style="float:right;">__TOC__</div>
  
Format is now:
+
=== Data types ===
  
{| class="wikitable"
+
No changes so far.
! Name
+
 
! Type
+
=== Packets ===
! Meaning
 
|-
 
| Index
 
| Unsigned Byte
 
| Unique index key, if this is 0xFF then the its the end of the metadata and no more is read
 
|-
 
| Type
 
| Unsigned Type
 
| The type of the index, see the table below
 
|} 
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Type ID
+
  ! ID
  ! Meaning
+
  ! Packet name
 +
!colspan="2"| Documentation
 
  |-
 
  |-
| 0
+
!colspan="4"| Play clientbound
| Byte
+
{{PacketList|0x05|Sculk Vibration Signal|rel=added}}
 +
{{PacketList|{{change|0x05|0x06}}|Entity Animation (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x06|0x07}}|Statistics|pre=unchanged}}
 +
{{PacketList|{{change|0x07|0x08}}|Acknowledge Player Digging|pre=unchanged}}
 +
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
 +
{{PacketList|{{change|0x09|0x0A}}|Block Entity Data|pre=unchanged}}
 +
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
 +
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
 +
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
 +
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
 +
{{PacketList|0x10|Clear Titles|rel=added}}
 +
{{PacketList|{{change|0x0F|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x10|0x12}}|Declare Commands|pre=unchanged}}
 +
{{PacketList|0x11|Window Confirmation (clientbound)|pre=removed}}
 +
{{PacketList|{{change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x13|0x14}}|Window Items|pre=unchanged}}
 +
{{PacketList|{{change|0x14|0x15}}|Window Property|pre=unchanged}}
 +
{{PacketList|{{change|0x15|0x16}}|Set Slot|pre=unchanged}}
 +
{{PacketList|{{change|0x16|0x17}}|Set Cooldown|pre=unchanged}}
 +
{{PacketList|{{change|0x17|0x18}}|Plugin Message (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x18|0x19}}|Named Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x19|0x1A}}|Disconnect (play)|pre=unchanged}}
 +
{{PacketList|{{change|0x1A|0x1B}}|Entity Status|pre=unchanged}}
 +
{{PacketList|{{change|0x1B|0x1C}}|Explosion|pre=unchanged}}
 +
{{PacketList|{{change|0x1C|0x1D}}|Unload Chunk|pre=unchanged}}
 +
{{PacketList|{{change|0x1D|0x1E}}|Change Game State|pre=unchanged}}
 +
{{PacketList|{{change|0x1E|0x1F}}|Open Horse Window|pre=unchanged}}
 +
{{PacketList|0x20|Initialize World Border|rel=added}}
 +
{{PacketList|{{change|0x1F|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x20|0x22}}|Chunk Data}}
 +
{{PacketList|{{change|0x21|0x23}}|Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x22|0x24}}|Particle|pre=unchanged}}
 +
{{PacketList|{{change|0x23|0x25}}|Update Light}}
 +
{{PacketList|{{change|0x24|0x26}}|Join Game|pre=unchanged}}
 +
{{PacketList|{{change|0x25|0x27}}|Map Data}}
 +
{{PacketList|{{change|0x26|0x28}}|Trade List|pre=unchanged}}
 +
{{PacketList|{{change|0x27|0x29}}|Entity Position|pre=unchanged}}
 +
{{PacketList|{{change|0x28|0x2A}}|Entity Position and Rotation|pre=unchanged}}
 +
{{PacketList|{{change|0x29|0x2B}}|Entity Rotation|pre=unchanged}}
 +
{{PacketList|0x2A|Entity Movement|pre=removed}}
 +
{{PacketList|{{change|0x2B|0x2C}}|Vehicle Move (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x2C|0x2D}}|Open Book|pre=unchanged}}
 +
{{PacketList|{{change|0x2D|0x2E}}|Open Window|pre=unchanged}}
 +
{{PacketList|{{change|0x2E|0x2F}}|Open Sign Editor|pre=unchanged}}
 +
{{PacketList|{{change|0x2F|0x30}}|Craft Recipe Response|pre=unchanged}}
 +
{{PacketList|{{change|0x30|0x31}}|Player Abilities (clientbound)|pre=unchanged}}
 +
{{PacketList|0x31|Combat Event|pre=removed}}
 +
{{PacketList|0x32|End Combat Event|rel=added}}
 +
{{PacketList|0x33|Enter Combat Event|rel=added}}
 +
{{PacketList|0x34|Death Combat Event|rel=added}}
 +
{{PacketList|{{change|0x32|0x35}}|Player Info|pre=unchanged}}
 +
{{PacketList|{{change|0x33|0x36}}|Face Player|pre=unchanged}}
 +
{{PacketList|0x36|Destroy Entities}}|rel=removed}}
 +
{{PacketList|{{change|0x34|0x37}}|Player Position And Look (clientbound)}}
 +
{{PacketList|{{change|0x35|0x38}}|Unlock Recipes|pre=unchanged}}
 +
{{PacketList|0x39|Destroy Entity}}|rel=added}}
 +
{{PacketList|{{change|0x37|0x3A}}|Remove Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x38|0x3B}}|Resource Pack Send}}
 +
{{PacketList|{{change|0x39|0x3C}}|Respawn|pre=unchanged}}
 +
{{PacketList|{{change|0x3A|0x3D}}|Entity Head Look|pre=unchanged}}
 +
{{PacketList|{{change|0x3B|0x3E}}|Multi Block Change|pre=unchanged}}
 +
{{PacketList|{{change|0x3C|0x3F}}|Select Advancement Tab|pre=unchanged}}
 +
{{PacketList|0x40|Action Bar|rel=added}}
 +
{{PacketList|0x41|World Border Center|rel=added}}
 +
{{PacketList|0x42|World Border Lerp Size|rel=added}}
 +
{{PacketList|0x43|World Border Size |rel=added}}
 +
{{PacketList|0x44|World Border Warning Delay|rel=added}}
 +
{{PacketList|0x45|World Border Warning Reach|rel=added}}
 +
{{PacketList|{{change|0x3E|0x46}}|Camera|pre=unchanged}}
 +
{{PacketList|{{change|0x3F|0x47}}|Held Item Change (clientbound)|pre=unchanged}}
 +
{{PacketList|{{change|0x40|0x48}}|Update View Position|pre=unchanged}}
 +
{{PacketList|{{change|0x41|0x49}}|Update View Distance|pre=unchanged}}
 +
{{PacketList|{{change|0x42|0x4A}}|Spawn Position|pre=unchanged}}
 +
{{PacketList|{{change|0x43|0x4B}}|Display Scoreboard|pre=unchanged}}
 +
{{PacketList|{{change|0x44|0x4C}}|Entity Metadata|pre=unchanged}}
 +
{{PacketList|{{change|0x45|0x4D}}|Attach Entity|pre=unchanged}}
 +
{{PacketList|{{change|0x46|0x4E}}|Entity Velocity|pre=unchanged}}
 +
{{PacketList|{{change|0x47|0x4F}}|Entity Equipment|pre=unchanged}}
 +
{{PacketList|0x4F|Title|rel=removed}}
 +
{{PacketList|{{change|0x48|0x50}}|Set Experience|pre=unchanged}}
 +
{{PacketList|{{change|0x49|0x51}}|Update Health|pre=unchanged}}
 +
{{PacketList|{{change|0x4A|0x52}}|Scoreboard Objective|pre=unchanged}}
 +
{{PacketList|{{change|0x4B|0x53}}|Set Passengers|pre=unchanged}}
 +
{{PacketList|{{change|0x4C|0x54}}|Teams|pre=unchanged}}
 +
{{PacketList|{{change|0x4D|0x55}}|Update Score|pre=unchanged}}
 +
{{PacketList|0x56|Set Title SubTitle|rel=added}}
 +
{{PacketList|0x57|Time Update|pre=unchanged}}
 +
{{PacketList|0x58|Set Title Text|rel=added}}
 +
{{PacketList|0x59|Set Title Time|rel=added}}
 +
{{PacketList|{{change|0x50|0x5A}}|Entity Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x51|0x5B}}|Sound Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x52|0x5C}}|Stop Sound|pre=unchanged}}
 +
{{PacketList|{{change|0x53|0x5D}}|Player List Header And Footer|pre=unchanged}}
 +
{{PacketList|{{change|0x54|0x5E}}|NBT Query Response|pre=unchanged}}
 +
{{PacketList|{{change|0x55|0x5F}}|Collect Item|pre=unchanged}}
 +
{{PacketList|{{change|0x56|0x60}}|Entity Teleport|pre=unchanged}}
 +
{{PacketList|{{change|0x57|0x61}}|Advancements|pre=unchanged}}
 +
{{PacketList|{{change|0x58|0x62}}|Entity Properties|pre=unchanged}}
 +
{{PacketList|{{change|0x59|0x63}}|Entity Effect|pre=unchanged}}
 +
{{PacketList|{{change|0x5A|0x64}}|Declare Recipes|pre=unchanged}}
 +
{{PacketList|{{change|0x5B|0x65}}|Tags}}
 
  |-
 
  |-
| 1
+
!colspan="4"| Play serverbound
| VarInt
+
{{PacketList|0x05|Client Settings}}
 
  |-
 
  |-
| 2
+
!colspan="4"| Handshaking serverbound
| Float
+
{{PacketList|0x00|Handshake}}
|-
+
  |}
| 3
+
 
| String
+
== New/modified data types ==
|-
+
 
| 4
+
No changes so far.
| [[Chat]]
+
 
|-
+
== Entity Metadata ==
| 5
+
 
| [[Slot]]
+
{{#vardefine:meta_prerelease|1}}
|-
+
 
|-
+
{{Warning2|Note that other entities have had metadata shifts due to these changes, not shown here.}}
  | 6
+
 
| Boolean
+
=== Entity ===
|-
+
 
| 7
+
{{metadata inherit|Entity}}
| Vector3F (3 floats)
 
|-
 
| 8
 
| Position
 
|-
 
| 9
 
| Bool, if true then its followed by Position
 
|-
 
| 10
 
| Direction (VarInt)
 
|-
 
| 11
 
| Bool, if true then its followed by UUID
 
|}
 
  
 
{| class="wikitable"
 
{| class="wikitable"
! Entity
 
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 +
|-
 +
|rowspan="9"| {{Metadata id|}}
 +
|rowspan="9"| Byte
 +
! Bit mask
 
  ! Meaning
 
  ! Meaning
 +
|rowspan="9"| 0
 
  |-
 
  |-
  | Entity || 0 || Byte || Unknown
+
  | 0x01
 +
| Is on fire
 
  |-
 
  |-
  | Entity || 1 || VarInt || Unknown
+
  | 0x02
 +
| Is crouching
 
  |-
 
  |-
  | Entity || 2 || String || Unknown
+
  | 0x04
 +
| Unused (previously riding)
 
  |-
 
  |-
  | Entity || 3 || Boolean || Unknown
+
  | 0x08
 +
| Is sprinting
 
  |-
 
  |-
  | Entity || 4 || Boolean || Unknown
+
  | 0x10
 +
| Is swimming
 
  |-
 
  |-
  | Living <sup>extends Entity</sup> || 5 || Byte || Unknown
+
  | 0x20
 +
| Is invisible
 
  |-
 
  |-
  | Living <sup>extends Entity</sup> || 6 || Float || Unknown
+
  | 0x40
 +
| has glowing effect
 
  |-
 
  |-
  | Living <sup>extends Entity</sup> || 7 || VarInt || Unknown
+
  | 0x80
 +
| Is flying with an {{Minecraft Wiki|elytra}}
 
  |-
 
  |-
  | Living <sup>extends Entity</sup> || 8 || Boolean || Unknown
+
  | {{Metadata id|}}
 +
| VarInt
 +
|colspan="2"| Air ticks
 +
| 300
 
  |-
 
  |-
  | Living <sup>extends Entity</sup> || 9 || VarInt || Unknown
+
  | {{Metadata id|}}
 +
| OptChat
 +
|colspan="2"| Custom name
 +
| empty
 
  |-
 
  |-
  | Insentient <sup>extends Living</sup> || 10 || Byte || Unknown
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is custom name visible
 +
| false
 
  |-
 
  |-
  | Slime <sup>extends Insentient</sup> || 11 || VarInt || Unknown
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Is silent
 +
| false
 
  |-
 
  |-
  | AreaEffectCloud <sup>extends Entity</sup> || 5 || Float || Unknown
+
  | {{Metadata id|}}
 +
| Boolean
 +
|colspan="2"| Has no gravity
 +
| false
 
  |-
 
  |-
  | AreaEffectCloud <sup>extends Entity</sup> || 6 || VarInt || Unknown
+
  | {{Metadata id|}}
|-
+
  | Pose
| AreaEffectCloud <sup>extends Entity</sup> || 7 || Boolean || Unknown
+
  |colspan="2"| Pose
|-
+
  | STANDING
| AreaEffectCloud <sup>extends Entity</sup> || 8 || VarInt || Unknown
+
  |- {{added}}
|-
+
  | {{Metadata id|added}}
| ArmorStand <sup>extends Living</sup> || 10 || Byte || Unknown
+
  | VarInt
|-
+
  |colspan="2"| Ticks frozen in powdered snow
| ArmorStand <sup>extends Living</sup> || 11 || Vector3F || Unknown
+
  | 0
|-
 
| ArmorStand <sup>extends Living</sup> || 12 || Vector3F || Unknown
 
|-
 
| ArmorStand <sup>extends Living</sup> || 13 || Vector3F || Unknown
 
|-
 
| ArmorStand <sup>extends Living</sup> || 14 || Vector3F || Unknown
 
|-
 
| ArmorStand <sup>extends Living</sup> || 15 || Vector3F || Unknown
 
|-
 
| ArmorStand <sup>extends Living</sup> || 16 || Vector3F || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 5 || VarInt || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 6 || VarInt || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 7 || Float || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 8 || VarInt || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 9 || VarInt || Unknown
 
|-
 
| Minecart <sup>extends Entity</sup> || 10 || Boolean || Unknown
 
|-
 
| Shulker <sup>extends Golem</sup> || 11 || Direction || Unknown
 
|-
 
| Shulker <sup>extends Golem</sup> || 12 || Option Position || Unknown
 
|-
 
| Shulker <sup>extends Golem</sup> || 13 || Byte || Unknown
 
|-
 
| Item <sup>extends Entity</sup> || 5 || [[Slot]] || Unknown
 
|-
 
| Ageable <sup>extends Creature</sup> || 11 || Boolean || Unknown
 
|-
 
| Sheep <sup>extends Animal</sup> || 12 || Byte || Unknown
 
|-
 
| Rabbit <sup>extends Animal</sup> || 12 || VarInt || Unknown
 
|-
 
| TNTPrimed <sup>extends Entity</sup> || 5 || VarInt || Unknown
 
|-
 
| Villager <sup>extends Ageable</sup> || 12 || VarInt || Unknown
 
|-
 
| Arrow <sup>extends Entity</sup> || 5 || Byte || Unknown
 
|-
 
| TameableAnimal <sup>extends Animal</sup> || 12 || Byte || Unknown
 
|-
 
| TameableAnimal <sup>extends Animal</sup> || 13 || Optional UUID || Unknown
 
|-
 
| Ocelot <sup>extends TameableAnimal</sup> || 14 || VarInt || Unknown
 
|-
 
| Fireworks <sup>extends Entity</sup> || 5 || [[Slot]] || Unknown
 
|-
 
| Spider <sup>extends Monster</sup> || 11 || Byte || Unknown
 
|-
 
| EnderCrystal <sup>extends Entity</sup> || 5 || Option Position || Unknown
 
|-
 
| TippedArrow <sup>extends Arrow</sup> || 6 || VarInt || Unknown
 
|-
 
| ItemFrame <sup>extends Hanging</sup> || 5 || [[Slot]] || Unknown
 
|-
 
| ItemFrame <sup>extends Hanging</sup> || 6 || VarInt || Unknown
 
|-
 
| Bat <sup>extends Ambient</sup> || 11 || Byte || Unknown
 
|-
 
| Skeleton <sup>extends Monster</sup> || 11 || VarInt || Unknown
 
|-
 
| Skeleton <sup>extends Monster</sup> || 12 || Boolean || Unknown
 
|-
 
| Witch <sup>extends Monster</sup> || 11 || Boolean || Unknown
 
|-
 
| MinecartCommandBlock <sup>extends Minecart</sup> || 11 || String || Unknown
 
|-
 
| MinecartCommandBlock <sup>extends Minecart</sup> || 12 || [[Chat]] || Unknown
 
|-
 
| Wither <sup>extends Monster</sup> || 11 || VarInt || Unknown
 
|-
 
| Wither <sup>extends Monster</sup> || 12 || VarInt || Unknown
 
|-
 
| Wither <sup>extends Monster</sup> || 13 || VarInt || Unknown
 
|-
 
| Wither <sup>extends Monster</sup> || 14 || VarInt || Unknown
 
|-
 
| MinecartFurnace <sup>extends Minecart</sup> || 11 || Boolean || Unknown
 
|-
 
| Ghast <sup>extends Flying</sup> || 11 || Boolean || Unknown
 
|-
 
| EnderDragon <sup>extends Insentient</sup> || 11 || VarInt || Unknown
 
|-
 
| Pig <sup>extends Animal</sup> || 12 || Boolean || Unknown
 
|-
 
| Horse <sup>extends Animal</sup> || 12 || Byte || Unknown
 
|-
 
| Horse <sup>extends Animal</sup> || 13 || VarInt || Unknown
 
|-
 
| Horse <sup>extends Animal</sup> || 14 || VarInt || Unknown
 
|-
 
| Horse <sup>extends Animal</sup> || 15 || Optional UUID || Unknown
 
|-
 
| Horse <sup>extends Animal</sup> || 16 || VarInt || Unknown
 
|-
 
| Creeper <sup>extends Monster</sup> || 11 || VarInt || Unknown
 
|-
 
| Creeper <sup>extends Monster</sup> || 12 || Boolean || Unknown
 
|-
 
| Creeper <sup>extends Monster</sup> || 13 || Boolean || Unknown
 
|-
 
| Zombie <sup>extends Monster</sup> || 11 || Boolean || Unknown
 
|-
 
| Zombie <sup>extends Monster</sup> || 12 || Boolean || Unknown
 
|-
 
| Zombie <sup>extends Monster</sup> || 13 || Boolean || Unknown
 
|-
 
| Guardian <sup>extends Monster</sup> || 11 || Byte || Unknown
 
|-
 
| Guardian <sup>extends Monster</sup> || 12 || VarInt || Unknown
 
|-
 
| Blaze <sup>extends Monster</sup> || 11 || Byte || Unknown
 
|-
 
| Wolf <sup>extends TameableAnimal</sup> || 14 || Float || Unknown
 
|-
 
| Wolf <sup>extends TameableAnimal</sup> || 15 || Boolean || Unknown
 
  |-
 
  | Wolf <sup>extends TameableAnimal</sup> || 16 || VarInt || Unknown
 
  |-
 
| IronGolem <sup>extends Golem</sup> || 11 || Byte || Unknown
 
  |-
 
  | Boat <sup>extends Entity</sup> || 5 || VarInt || Unknown
 
  |-
 
| Boat <sup>extends Entity</sup> || 6 || VarInt || Unknown
 
  |-
 
| Boat <sup>extends Entity</sup> || 7 || Float || Unknown
 
|-
 
  | WitherSkull <sup>extends Fireball</sup> || 5 || Boolean || Unknown
 
 
  |}
 
  |}
  
== Handshaking ==
+
== Block Actions ==
 
 
=== Clientbound ===
 
  
 
No changes so far.
 
No changes so far.
  
=== Serverbound ===
+
== Inventories ==
  
==== Handshake ====
+
No changes so far.
  
This causes the server to switch into the target state.
+
== Plugin Channels ==
  
{| class="wikitable"
+
No changes so far.
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="4"| 0x00
 
|rowspan="4"| Handshaking
 
|rowspan="4"| Server
 
| Protocol Version
 
| VarInt
 
| See [[protocol version numbers]] (currently {{Change|47|58}})
 
|-
 
| Server Address
 
| String
 
| hostname or IP, e.g. localhost or 127.0.0.1<!-- does this support IPv6? -->
 
|-
 
| Server Port
 
| Unsigned Short
 
| default is 25565
 
|-
 
| Next State
 
| VarInt
 
| 1 for [[#Status|status]], 2 for [[#Login|login]]
 
|}
 
  
 
== Play ==
 
== Play ==
Line 284: Line 231:
 
=== Clientbound ===
 
=== Clientbound ===
  
==== Entity Equipment ====
+
==== Sculk Vibration Signal ====
  
{| class="wikitable"
+
{| class="wikitable" {{Added}}
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 294: Line 241:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x04
+
  |rowspan="4"| 0x05
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Client
+
  |rowspan="4"| Client
  | Entity ID
+
  | Source Position
  | VarInt
+
  | Position
  | Entity's EID
+
  | Source position for the vibration.
 +
|-
 +
| Destination Identifier
 +
| Identifier
 +
| Identifier of the destination codec type.
 
  |-
 
  |-
  | Slot
+
  | Destination
  | {{Change|Short|VarInt}}
+
  | Varies
  | Equipment slot. 0: main hand, {{Change||1: off hand}}, {{Change|1–4|2–5}}: armor slot (2: boots, 3: leggings, 4: chestplate, 5: helmet)
+
  | Vanilla default destinations are a block position encoded as a [https://wiki.vg/Protocol#Data_types Position] for "block" or an entity id encoded as a VarInt for "entity".
 
  |-
 
  |-
  | Item
+
  | Arrival Ticks
  | [[Slot Data|Slot]]
+
  | VarInt
  | Item in slot format
+
  | Ticks for the signal to arrive at the destination.
 
  |}
 
  |}
 +
This packet shows a permanent particle.
  
==== Spawn Player ====
+
==== Clear Titles====
  
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
+
{| class="wikitable" {{Added}}
 
 
This packet must be sent after the [[Protocol#Player List Item|Player List Item]] ([[#Play|Play]], 0x38, clientbound) packet that adds the player data for the client to use when spawning a player. The tab includes skin/cape data.
 
 
 
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
 
 
 
When in online-mode the UUIDs must be valid and have valid skin blobs, in offline-mode UUID v3 is used.
 
 
 
For NPCs UUID v2 should be used. Note:
 
 
 
<+Grum> i will never confirm this as a feature you know that :)
 
 
 
In an example UUID, <code>xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx</code>, the UUID version is specified by <code>Y</code>. So, for UUID v3, <code>Y</code> will always be <code>3</code>, and for UUID v2, <code>Y</code> will always be <code>2</code>.
 
 
 
{| class="wikitable"
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 333: Line 271:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="9"| 0x0C
+
  |rowspan="4"| 0x10
  |rowspan="9"| Play
+
  |rowspan="4"| Play
  |rowspan="9"| Client
+
  |rowspan="4"| Client
| Entity ID
+
  |- {{ Added }}
| VarInt
+
  | Reset
| Player's EID
+
  | Boolean
|-
 
| Player UUID
 
| UUID
 
|
 
|-
 
| X
 
| Int
 
| Player X as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Y
 
| Int
 
| Player Y as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Z
 
| Int
 
| Player Z as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Yaw
 
| Angle
 
|
 
  |-
 
  | Pitch
 
  | Angle
 
 
  |  
 
  |  
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| Current Item
 
| Short
 
| The item the player is currently holding. Note that this should be 0 for “no item”, unlike -1 used in other packets.
 
 
  |-
 
  |-
| Metadata
 
| [[Entities#Entity Metadata Format|Metadata]]
 
|
 
 
  |}
 
  |}
  
{{Warning|The client will crash if no Metadata is sent}}
+
==== Initialize World Border ====  
 
 
==== Spawn Object ====
 
 
 
Sent by the server when an object/vehicle is created.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 387: Line 291:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="13"| 0x0E
+
  |rowspan="8"| 0x20
  |rowspan="13"| Play
+
  |rowspan="8"| Play
  |rowspan="13"| Client
+
  |rowspan="8"| Client
  | Entity ID
+
  | X
  | VarInt
+
  | Double
| EID of the object
 
|- style="background-color: #d9ead3;"
 
| Object UUID
 
| UUID
 
 
  |  
 
  |  
  |-
+
  |- {{ Added }}
| Type
 
| Byte
 
| The type of object (See [[Entities#Objects]])
 
|-
 
| 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
 
  | Z
  | Int
+
  | Double
| Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
 
|-
 
| Pitch
 
| Angle
 
 
  |  
 
  |  
  |-
+
  |- {{ Added }}
  | Yaw
+
  | Old Diameter
  | Angle
+
  | Double
  |  
+
  | Current length of a single side of the world border, in meters.
  |- style="background-color: #f4cccc; text-decoration: line-through;"
+
  |- {{ Added }}
  | Data
+
  | New Diameter
  | [[Object Data]]
+
  | Double
  |  
+
  | Target length of a single side of the world border, in meters.
  |- style="background-color: #d9ead3;"
+
  |- {{ Added }}
  | Info
+
  | Speed
  | Int
+
  | VarLong
  | Depends on Type; see [[Object Data#Meaning of int field]]
+
  | Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
  |- style="background-color: #d9ead3;"
+
  |- {{ Added }}
  | Velocity X
+
  | Portal Teleport Boundary
  | Short
+
  | VarInt
  |
+
  | Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
  |- style="background-color: #d9ead3;"
+
  |- {{ Added }}
  | Velocity Y
+
  | Warning Blocks
  | Short
+
  | VarInt
  |
+
  | In meters.
  |-  style="background-color: #d9ead3;"
+
  |- {{ Added }}
  | Velocity Z
+
  | Warning Time
  | Short
+
  | VarInt
  |
+
  | In seconds as set by <code>/worldborder warning time</code>.
 +
  |- {{ Added }}
 
  |}
 
  |}
  
==== Spawn Mob ====
+
The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:
  
Sent by the server when a mob entity is spawned.
+
<syntaxhighlight lang="java">
 +
distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
 +
if (playerDistance < distance) {
 +
    warning = 1.0 - playerDistance / distance;
 +
} else {
 +
    warning = 0.0;
 +
}
 +
</syntaxhighlight>
 +
 
 +
==== Chunk Data ====
 +
{{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 dimension 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"
Line 456: Line 356:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x0F
+
  |rowspan="13"| {{change|0x20|0x22}}
 
  |rowspan="13"| Play
 
  |rowspan="13"| Play
 
  |rowspan="13"| Client
 
  |rowspan="13"| Client
  | Entity ID
+
  | Chunk X
| VarInt
 
|
 
|- style="background-color: #d9ead3;"
 
| Entity UUID
 
| UUID
 
|
 
|-
 
| Type
 
| Unsigned Byte
 
| The type of mob. See [[Entities#Mobs]]
 
|-
 
| X
 
 
  | Int
 
  | Int
  | X position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  | Y
+
  | Chunk Z
 
  | Int
 
  | Int
  | Y position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 +
|- {{removed}}
 +
| Full chunk
 +
| Boolean
 +
| See [[Chunk Format#Full chunk|Chunk Format]]
 +
|- {{removed}}
 +
| 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).
 +
|- {{added}}
 +
| Bit Mask Length
 +
| VarInt
 +
| Length of the following array
 +
|- {{added}}
 +
| Primary Bit Mask
 +
| Array of Long
 +
| BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
 
  |-
 
  |-
  | Z
+
  | Heightmaps
  | Int
+
  | [[NBT]]
  | Z position as a [[Data Types#Fixed-point numbers|Fixed-Point number]]
+
  | 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.
 +
|-  
 +
| Biomes length
 +
| {{change|Optional|}} VarInt
 +
| Size of the following array; should always be 1024.  {{change|Not present if full chunk is false.|}}
 
  |-
 
  |-
  | Yaw
+
  | Biomes
  | Angle
+
  | {{change|Optional|}} Array of VarInt
  |  
+
| 1024 biome IDs, ordered by x then z then y, in 4&times;4&times;4 blocks.  {{change|Not present if full chunk is false.|}}  See [[Chunk Format#Biomes|Chunk Format § Biomes]].
 +
|-
 +
| Size
 +
| VarInt
 +
  | Size of Data in bytes
 
  |-
 
  |-
  | Pitch
+
  | Data
  | Angle
+
  | Byte array
  |  
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
|-
 
| Head Pitch
 
| Angle
 
|
 
|-
 
| Velocity X
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Y
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Velocity Z
 
| Short
 
| Same units as [[Protocol#Entity Velocity|Entity Velocity]]
 
|-
 
| Metadata
 
| [[Entities#Entity Metadata Format|Metadata]]
 
|
 
|}
 
 
 
==== Entity Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x1A
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Entity ID
 
| Int
 
|
 
|-
 
| Entity Status
 
| Byte
 
| See below
 
|}
 
 
 
{| class="wikitable"
 
|-
 
! Entity Status
 
! Meaning
 
|-
 
| 1
 
| Sent when resetting a mob spawn minecart's timer — appears to be unused by the client
 
|-
 
| 2
 
| Living Entity hurt
 
|-
 
| 3
 
| Living Entity dead
 
|-
 
| 4
 
| Iron Golem throwing up arms
 
|-
 
| 6
 
| Wolf/Ocelot/Horse taming — Spawn “heart” particles
 
|-
 
| 7
 
| Wolf/Ocelot/Horse tamed — Spawn “smoke” particles
 
|-
 
| 8
 
| Wolf shaking water — Trigger the shaking animation
 
|-
 
| 9
 
| (of self) Eating accepted by server
 
 
  |-
 
  |-
| 10
+
  | Number of block entities
| Sheep eating grass
 
|-
 
| 10
 
| Play TNT ignite sound
 
|-
 
| 11
 
| Iron Golem handing over a rose
 
|-
 
| 12
 
| Villager mating — Spawn “heart” particles
 
|-
 
| 13
 
| Spawn particles indicating that a villager is angry and seeking revenge
 
|-
 
| 14
 
| Spawn happy particles near a villager
 
|-
 
| 15
 
| Witch animation — Spawn “magic” particles
 
|-
 
| 16
 
| Play zombie converting into a villager sound
 
|-
 
| 17
 
| Firework exploding
 
|-
 
| 18
 
| Animal in love (ready to mate) — Spawn “heart” particles
 
|-
 
| 19
 
| Reset squid rotation
 
|-
 
| 20
 
| Spawn explosion particle — works for some living entities
 
|-
 
| 21
 
| Play guardian sound — works for every entity
 
|-
 
| 22
 
| Enables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|-
 
| 23
 
| Disables reduced {{Minecraft Wiki|Debug screen|debug}} for players
 
|- style="background-color: #d9ead3;"
 
| 24–28
 
| Sets {{Minecraft Wiki|Server.properties#op-permission-level|op permission level}} 0–4 for players
 
|}
 
 
 
==== Entity Properties ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
|-
 
|rowspan="6"| 0x20
 
|rowspan="6"| Play
 
|rowspan="6"| Client
 
|colspan="2"| Entity ID
 
|colspan="2"| VarInt
 
|
 
|-
 
|colspan="2"| Number Of Properties
 
|colspan="2"| Int
 
  | Number of elements in the following array
 
|-
 
|rowspan="4"| Property
 
| Key
 
|rowspan="4"| Array
 
| String
 
| See below
 
|-
 
| Value
 
| Double
 
| See below
 
|-
 
| Number Of Modifiers
 
 
  | VarInt
 
  | VarInt
 
  | Number of elements in the following array
 
  | Number of elements in the following array
 
  |-
 
  |-
  | Modifiers
+
  | Block entities
  | Array of Modifier Data
+
  | Array of [[NBT|NBT Tag]]
  | See {{Minecraft Wiki|Attribute#Modifiers}}
+
  | All block entities in the chunk.  Use the x, y, and z tags in the NBT to determine their positions.
 
  |}
 
  |}
  
Known Key values:
+
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.
  
{| class="wikitable"
+
The compacted array format has been adjusted so that individual entries no longer span across multiple longs, affecting the main data array and heightmaps.
|-
 
! Key
 
! Default
 
! Min
 
! Max
 
! Label
 
|-
 
| generic.maxHealth
 
| 20.0
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Max Health
 
|-
 
| generic.followRange
 
| 32.0
 
| 0.0
 
| 2048.0
 
| Follow Range
 
|-
 
| generic.knockbackResistance
 
| 0.0
 
| 0.0
 
| 1.0
 
| Knockback Resistance
 
|-
 
| generic.movementSpeed
 
| 0.699999988079071
 
| 0.0
 
| {{Change|Double.MaxValue|1024.0}}
 
| Movement Speed
 
|-
 
| generic.attackDamage
 
| 2.0
 
| 0.0
 
| {{Change|Double.MaxValue|2048.0}}
 
| {{Change||Attack Damage}}
 
|- style="background-color: #d9ead3;"
 
| generic.attackSpeed
 
| 4.0
 
| 0.0
 
| 1024.0
 
| Attack Speed
 
|-
 
| horse.jumpStrength
 
| 0.7
 
| 0.0
 
| 2.0
 
| Jump Strength
 
|-
 
| zombie.spawnReinforcements
 
| 0.0
 
| 0.0
 
| 1.0
 
| Spawn Reinforcements Chance
 
|}
 
  
''Modifier Data'' structure:
+
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>
  
{| class="wikitable"
+
<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>
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| UUID
 
| UUID
 
|
 
|-
 
| Amount
 
| Double
 
|
 
|-
 
| Operation
 
| Byte
 
|
 
|}
 
 
 
==== Chunk Data ====
 
 
 
Chunks are not unloaded by the client automatically. To unload chunks, {{Change|send this packet with Ground-Up Continuous{{=}}true and no 16^3 chunks (eg. Primary Bit Mask{{=}}0)|send an [[#Unload Chunk|Unload Chunk]] packet with the chunk's X and Z coordinates}}. The server does not send skylight information for nether-chunks, it's up to the client to know if the player is currently in the nether. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.
 
 
 
See also: [[SMP Map Format]]
 
  
Changes in 1.8:
+
==== Entity Movement ====
  
* Data value section removed
+
This packet may be used to initialize an entity.
* Extended id section removed
 
* Block id section is now a unsigned short (little endian) per a block
 
* The block id is equal to <code>(id << 4) | data</code>
 
  
Changes in 1.9:
+
For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.
* Chunk mask changed from unsigned short to int.
 
* Block array prefixed with list of block state IDs possible within the chunk.
 
* Block array values replaced with list indices of block state IDs.
 
* Block array element size varies depending on number of possible elements. (e.g. up to 15 possible states = nibble, up to 255 possible states = byte, etc.)
 
* No longer sent to unload chunks.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 759: Line 434:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{removed}}
  |rowspan="6"| 0x21
+
  | 0x2A
  |rowspan="6"| Play
+
  | Play
  |rowspan="6"| Client
+
  | Client
  | Chunk X
+
  | Entity ID
| Int
 
| Chunk X coordinate
 
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
|-
 
| Ground-Up Continuous
 
| Boolean
 
| This is true if the packet represents all sections in this vertical column, where the Primary Bit Mask specifies exactly which sections are included, and which are air
 
|-
 
| Primary Bit Mask
 
| {{Change|Unsigned Short|Int}}
 
| Bitmask with 1 for every 16x16x16 section whose data follows in the compressed data
 
|-
 
| Size
 
 
  | VarInt
 
  | VarInt
| Size of Data
 
|-
 
| Data
 
| [[SMP Map Format#Data|Chunk]]
 
 
  |  
 
  |  
 
  |}
 
  |}
  
==== {{Change||Unload Chunk}} ====
+
==== Update Light ====
 
 
Tells the client to unload a chunk.
 
  
{| class="wikitable"
+
Updates light levels for a chunk.
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| 0x22
 
|rowspan="2"| Play
 
|rowspan="2"| Client
 
| Chunk X
 
| Int
 
| Chunk X coordinate
 
|-
 
| Chunk Z
 
| Int
 
| Chunk Z coordinate
 
|}
 
  
==== Multi Block Change ====
 
Fired whenever 2 or more blocks are changed within the render distance.
 
 
{| class="wikitable"
 
{| class="wikitable"
 
  ! Packet ID
 
  ! Packet ID
Line 822: Line 455:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x22|0x23}}
+
  |rowspan="21"| {{change|0x23|0x25}}
  |rowspan="6"| Play
+
  |rowspan="21"| Play
  |rowspan="6"| Client
+
  |rowspan="21"| Client
 
  |colspan="2"| Chunk X
 
  |colspan="2"| Chunk X
  |colspan="2"| Int
+
  |colspan="2"| VarInt
  | Chunk X coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
 
  |colspan="2"| Chunk Z
 
  |colspan="2"| Chunk Z
  |colspan="2"| Int
+
  |colspan="2"| VarInt
  | Chunk Z coordinate
+
  | Chunk coordinate (block coordinate divided by 16, rounded down)
 
  |-
 
  |-
  |colspan="2"| Record Count
+
  |colspan="2"| Trust Edges
 +
|colspan="2"| Boolean
 +
| If edges should be trusted for light updates.
 +
|- {{removed}}
 +
|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)
 +
|- {{removed}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| VarInt
 +
| Mask containing 18 bits, with the same order as sky light
 +
|- {{removed}}
 +
|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.
 +
|- {{removed}}
 +
|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.
 +
|- {{Added}}
 +
|colspan="2"| Length 1
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array, i.e. the number of blocks affected
+
  | Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
 +
|- {{Added}}
 +
|colspan="2"| Length 2
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing bits for each sections in the world + 2, same order as sky light
 +
|- {{Added}}
 +
|colspan="2"| Length 3
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Sky Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
 +
|- {{Added}}
 +
|colspan="2"| Length 4
 +
|colspan="2"| VarInt
 +
| Length of the following array
 +
|- {{Added}}
 +
|colspan="2"| Empty Block Light Mask
 +
|colspan="2"| Array of Long
 +
| BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
 +
|- {{added}}
 +
|colspan="2"| Sky Light array count
 +
|colspan="2"| VarInt
 +
| Number of entries in the following array
 
  |-
 
  |-
  |rowspan="3"| Record
+
  |rowspan="2"| Sky Light arrays
  | Horizontal Position
+
  | Length
  |rowspan="3"| Array
+
  |rowspan="2"| Array
| Unsigned Byte
 
| The 4 most significant bits (<code>0xF0</code>) encode the X coordinate, relative to the chunk. The 4 least significant bits (<code>0x0F</code>) encode the Z coordinate, relative to the chunk.
 
|-
 
| Y Coordinate
 
| Unsigned Byte
 
|
 
|-
 
| Block ID
 
 
  | VarInt
 
  | VarInt
  | The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
+
  | Length of the following array in bytes (always 2048)
|}
 
 
 
==== Block Change ====
 
Fired whenever a block is changed within the render distance.
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x23|0x24}}
+
  | Sky Light array
  |rowspan="2"| Play
+
  | Array of 2048 bytes
  |rowspan="2"| Client
+
  | There is 1 array for each bit set to true in the sky light mask, starting with the lowest valueHalf a byte per light value.
| Location
+
  |- {{added}}
| Position
+
  |colspan="2"| Block Light array count
| Block Coordinates
+
  |colspan="2"| VarInt
|-
+
  | Number of entries in the following array
| Block ID
 
| VarInt
 
| The new block ID for the block. <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
 
  |}
 
 
 
==== Block Action ====
 
 
 
This packet is used for a number of things:
 
 
 
* Chests opening and closing
 
* Pistons pushing and pulling
 
* Note blocks playing
 
* Updating beacons
 
 
 
See Also: [[Block Actions]]
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
  |-
 
|rowspan="4"| {{Change|0x24|0x25}}
 
  |rowspan="4"| Play
 
  |rowspan="4"| Client
 
| Location
 
| Position
 
| Block Coordinates
 
|-
 
| Byte 1
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
|-
 
| Byte 2
 
| Unsigned Byte
 
| Varies depending on block — see [[Block Actions]]
 
|-
 
| Block Type
 
| VarInt
 
  | The block type for the block
 
|}
 
 
 
==== Block Break Animation ====
 
 
 
0–9 are the displayable destroy stages and each other number means that there is no animation on this coordinate.
 
 
 
You can also set an animation to air! The animation will still be visible.
 
 
 
If you need to display several break animations at the same time you have to give each of them a unique Entity ID.
 
 
 
Also if you set the coordinates to a special block like water etc. it won't show the actual break animation but some other interesting effects. (Water will lose it's transparency)
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x25|0x26}}
+
  |rowspan="2"| Block Light arrays
  |rowspan="3"| Play
+
  | Length
  |rowspan="3"| Client
+
  |rowspan="2"| Array
| Entity ID
 
 
  | VarInt
 
  | VarInt
  | EID for the animation
+
  | Length of the following array in bytes (always 2048)
|-
 
| Location
 
| Position
 
| Block Position
 
 
  |-
 
  |-
  | Destroy Stage
+
  | Block Light array
  | Byte
+
  | Array of 2048 bytes
  | 0–9 to set it, any other value to remove it
+
  | 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.
 
  |}
 
  |}
  
==== {{Change|Map Chunk Bulk}} ====
 
  
==== Maps ====
+
==== Map Data ====
  
Updates a rectangular area on a map.
+
Updates a rectangular area on a {{Minecraft Wiki|map}} item.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 961: Line 560:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="13"| 0x34
+
  |rowspan="18"| {{change|0x25|0x27}}
  |rowspan="13"| Play
+
  |rowspan="18"| Play
  |rowspan="13"| Client
+
  |rowspan="18"| Client
  |colspan="2"| Item Damage
+
  |colspan="2"| Map ID
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | The damage value (map ID) of the map being modified
+
  | Map ID of the map being modified
 
  |-
 
  |-
 
  |colspan="2"| Scale
 
  |colspan="2"| Scale
 
  |colspan="2"| Byte
 
  |colspan="2"| Byte
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
 
  | From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
  |- style="background-color: #d9ead3;"
+
  |- {{removed}}
  |colspan="2" | Tracking Position
+
  |colspan="2"| Tracking Position
  |colspan="2" | Boolean
+
  |colspan="2"| Boolean
  | Specifies whether the icons are shown
+
  | Specifies whether player and item frame icons are shown
 +
|-
 +
|colspan="2"| Locked
 +
|colspan="2"| Boolean
 +
| True if the map has been locked in a cartography table
 
  |-  
 
  |-  
 +
|- {{added}}
 +
|colspan="2"| Tracking Position
 +
|colspan="2"| Boolean
 +
| Specifies whether player and item frame icons are shown
 +
|-
 
  |colspan="2"| Icon Count
 
  |colspan="2"| Icon Count
 
  |colspan="2"| VarInt
 
  |colspan="2"| VarInt
  | Number of elements in the following array
+
  | Number of elements in the following array. {{change||Only present if "Tracking Position" is true.}}
 
  |-
 
  |-
  |rowspan="3"| Icon
+
  |rowspan="6"| Icon
  | Direction And Type
+
  | Type
  |rowspan="3"| Array
+
  |rowspan="6"| Array
  | Byte
+
  | VarInt enum
  | 0xF0 = Direction, 0x0F = Type
+
  | See below
 
  |-
 
  |-
 
  | X
 
  | X
 
  | Byte
 
  | Byte
  |  
+
  | Map coordinates: -128 for furthest left, +127 for furthest right
 
  |-
 
  |-
 
  | Z
 
  | Z
 
  | Byte
 
  | Byte
  |  
+
  | Map coordinates: -128 for highest, +127 for lowest
 +
|-
 +
| Direction
 +
| Byte
 +
| 0-15
 +
|-
 +
| Has Display Name
 +
| Boolean
 +
|
 +
|-
 +
| Display Name
 +
| Optional [[Chat]]
 +
| Only present if previous Boolean is true
 
  |-  
 
  |-  
 
  |colspan="2"| Columns
 
  |colspan="2"| Columns
  |colspan="2"| Byte
+
  |colspan="2"| Unsigned Byte
 
  | Number of columns updated
 
  | Number of columns updated
 
  |-
 
  |-
Line 1,017: Line 637:
 
  |colspan="2"| Optional Array of Unsigned Byte
 
  |colspan="2"| Optional Array of Unsigned Byte
 
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 
  | Only if Columns is more than 0; see {{Minecraft Wiki|Map item format}}
 +
|}
 +
 +
For icons, a direction of 0 is a vertical icon and increments by 22.5&deg; (360/16).
 +
 +
Types are based off of rows and columns in <code>map_icons.png</code>:
 +
 +
{| class="wikitable"
 +
|-
 +
! Icon type
 +
! Result
 +
|-
 +
| 0
 +
| White arrow (players)
 +
|-
 +
| 1
 +
| Green arrow (item frames)
 +
|-
 +
| 2
 +
| Red arrow
 +
|-
 +
| 3
 +
| Blue arrow
 +
|-
 +
| 4
 +
| White cross
 +
|-
 +
| 5
 +
| Red pointer
 +
|-
 +
| 6
 +
| White circle (off-map players)
 +
|-
 +
| 7
 +
| Small white circle (far-off-map players)
 +
|-
 +
| 8
 +
| Mansion
 +
|-
 +
| 9
 +
| Temple
 +
|-
 +
| 10
 +
| White Banner
 +
|-
 +
| 11
 +
| Orange Banner
 +
|-
 +
| 12
 +
| Magenta Banner
 +
|-
 +
| 13
 +
| Light Blue Banner
 +
|-
 +
| 14
 +
| Yellow Banner
 +
|-
 +
| 15
 +
| Lime Banner
 +
|-
 +
| 16
 +
| Pink Banner
 +
|-
 +
| 17
 +
| Gray Banner
 +
|-
 +
| 18
 +
| Light Gray Banner
 +
|-
 +
| 19
 +
| Cyan Banner
 +
|-
 +
| 20
 +
| Purple Banner
 +
|-
 +
| 21
 +
| Blue Banner
 +
|-
 +
| 22
 +
| Brown Banner
 +
|-
 +
| 23
 +
| Green Banner
 +
|-
 +
| 24
 +
| Red Banner
 +
|-
 +
| 25
 +
| Black Banner
 +
|-
 +
| 26
 +
| Treasure marker
 
  |}
 
  |}
  
 
==== Combat Event ====
 
==== Combat Event ====
 +
 +
Originally used for metadata for twitch streaming circa 1.8.  Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,028: Line 741:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Removed}}
  |rowspan="8"| 0x42
+
  |rowspan="8"| 0x31
 
  |rowspan="8"| Play
 
  |rowspan="8"| Play
 
  |rowspan="8"| Client
 
  |rowspan="8"| Client
 
  |colspan="2"| Event
 
  |colspan="2"| Event
  | VarInt
+
  | VarInt Enum
  | Determines the layout of the remaining packet
+
  | Determines the layout of the remaining packet.
  |-
+
  |- {{Removed}}
 
  ! Event
 
  ! Event
 
  ! Field Name
 
  ! Field Name
 
  !  
 
  !  
 
  !  
 
  !  
  |-
+
  |- {{Removed}}
 
  | 0: enter combat
 
  | 0: enter combat
 
  | ''no fields''
 
  | ''no fields''
 
  | ''no fields''
 
  | ''no fields''
 
  |  
 
  |  
  |-
+
  |- {{Removed}}
 
  |rowspan="2"| 1: end combat
 
  |rowspan="2"| 1: end combat
 
  | Duration
 
  | Duration
 
  | VarInt
 
  | VarInt
  |  
+
  | Length of the combat in ticks.
  |-
+
  |- {{Removed}}
 
  | Entity ID
 
  | Entity ID
 
  | Int
 
  | Int
  |  
+
  | ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
  |-
+
  |- {{Removed}}
 
  |rowspan="3"| 2: entity dead
 
  |rowspan="3"| 2: entity dead
 
  | Player ID
 
  | Player ID
 
  | VarInt
 
  | VarInt
  |  
+
  | Entity ID of the player that died (should match the client's entity ID).
  |-
+
  |- {{Removed}}
 
  | Entity ID
 
  | Entity ID
 
  | Int
 
  | Int
  |  
+
  | The killing entity's ID, or -1 if there is no obvious killer.
  |-
+
  |- {{Removed}}
 
  | Message
 
  | Message
  | {{Change|String|[[Chat]]}}
+
  | [[Chat]]
  |  
+
  | The death message.
 
  |}
 
  |}
  
==== {{Change|Update Entity NBT|}} ====  
+
==== End Combat Event ====
  
 
+
Unused by the Notchain client.
==== {{Change||Boss Bar}} ====
 
 
 
This packet replaces Update Entity NBT packet which has been removed.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,083: Line 793:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Added}}
  |rowspan="15"| 0x49
+
  |rowspan="8"| 0x32
  |rowspan="15"| Play
+
  |rowspan="8"| Play
  |rowspan="15"| Client
+
  |rowspan="8"| Client
  |colspan="2"| UUID
+
  | Duration
| UUID
 
| Unique ID for this bar
 
|-
 
|colspan="2"| Action
 
 
  | VarInt
 
  | VarInt
  | Determines the layout of the remaining packet
+
  | Length of the combat in ticks.
|-
+
  |- {{Added}}
! Action
+
  | Entity ID
! Field Name
+
  | Int
!
+
  | ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
!
+
  |- {{Added}}
|-
 
|rowspan="5"| 0: add
 
| Title
 
| [[Chat]]
 
|
 
|-
 
| Health
 
| Float
 
| From 0 to 1. Values greater than 1 do not crash the client, and start [https://i.johni0702.de/nA.png rendering part of a second health bar] at around 1.5
 
  |-
 
  | Color
 
  | VarInt
 
  | Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| Number of dividers rendered in the bar
 
|-
 
| 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
 
| as above
 
|-
 
| 3: update title
 
| Title
 
| [[Chat]]
 
|
 
|-
 
|rowspan="2"| 4: update style
 
| Color
 
| VarInt
 
| Color ID (see below)
 
|-
 
| Dividers
 
| VarInt
 
| as above
 
|-
 
| 5: update flags
 
| Flags
 
| Unsigned Byte
 
| as above
 
  |-
 
 
  |}
 
  |}
  
{| class="wikitable"
+
==== Enter Combat Event ====
! ID
 
! Color
 
|-
 
| 0
 
| Pink(ish)
 
|-
 
| 1
 
| Cyan
 
|-
 
| 2
 
| Red
 
|-
 
| 3
 
| Lime
 
|-
 
| 4
 
| Yellow
 
|-
 
| 5
 
| Purple
 
|-
 
| 6
 
| White
 
|}
 
 
 
==== {{Change||Set Cooldown}} ====
 
  
Applies a cooldown period to an item type.
+
Unused by the Notchain client.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,186: Line 815:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Added}}
  |rowspan="2"| 0x4A
+
  |rowspan="8"| 0x33
  |rowspan="2"| Play
+
  |rowspan="8"| Play
  |rowspan="2"| Client
+
  |rowspan="8"| Client
| Item ID
 
| VarInt
 
| ID of the item to apply a cooldown to.
 
|-
 
| Cooldown Ticks
 
| VarInt
 
| Number of ticks to apply a cooldown for.
 
 
  |}
 
  |}
  
=== Serverbound ===
 
 
==== Use 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.
+
==== Death Combat Event ====
  
Note that middle-click in creative mode is interpreted by the client and sent as a [[#Creative Inventory Action|Creative Inventory Action]] packet instead.
+
Used to send a respawn screen.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,216: Line 833:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{Added}}
  |rowspan="6"| 0x02
+
  |rowspan="8"| 0x34
  |rowspan="6"| Play
+
  |rowspan="8"| Play
  |rowspan="6"| Server
+
  |rowspan="8"| Client
  | Target
+
  | Player ID
 
  | VarInt
 
  | VarInt
  |  
+
  | Entity ID of the player that died (should match the client's entity ID).
  |-
+
  |- {{Added}}
  | Type
+
  | Entity ID
  | VarInt
+
  | Int
  | 0: interact, 1: attack, 2: interact at
+
  | The killing entity's ID, or -1 if there is no obvious killer.
|-
+
  |- {{Added}}
| Target X
+
  | Message
| Optional Float
+
  | [[Chat]]
| Only if Type is interact at
+
  | The death message.
|-
 
| Target Y
 
| Optional Float
 
| Only if Type is interact at
 
|-
 
| Target Z
 
| Optional Float
 
| Only if Type is interact at
 
  |- style="background-color: #d9ead3;"
 
  | Hand
 
  | Optional VarInt
 
  | Only if Type is interact or interact at; 0: main hand, 1: off hand
 
 
  |}
 
  |}
  
==== Player Digging ====
+
==== Player Position And Look (clientbound) ====  
  
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.
+
Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.
 +
 
 +
If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.
 +
 
 +
Also if the fixed-point number of X or Z is set greater than <code>3.2E7D</code> the client will be kicked for “Illegal position”.
 +
 
 +
Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.
 +
 
 +
Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,260: Line 873:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| 0x07
+
  |rowspan="8"| {{change|0x34|0x38}}
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Server
+
  |rowspan="8"| Client
  | Status
+
| X
  | Byte
+
| Double
  | The action the player is taking against the block (see below)
+
| Absolute or relative position, depending on Flags.
 +
|-
 +
| Y
 +
  | Double
 +
  | Absolute or relative position, depending on Flags.
 +
  |-
 +
| Z
 +
| Double
 +
| Absolute or relative position, depending on Flags.
 +
|-
 +
| Yaw
 +
| Float
 +
| Absolute or relative rotation on the X axis, in degrees.
 
  |-
 
  |-
  | Location
+
  | Pitch
  | Position
+
  | Float
  | Block position
+
  | Absolute or relative rotation on the Y axis, in degrees.
 
  |-
 
  |-
  | Face
+
  | Flags
 
  | Byte
 
  | Byte
  | The face being hit (see below)
+
  | Bit field, see below.
 +
|-
 +
| Teleport ID
 +
| VarInt
 +
| Client should confirm this packet with [[#Teleport Confirm|Teleport Confirm]] containing the same Teleport ID.
 +
|- {{added}}
 +
| Dismount Vehicle
 +
| Boolean
 +
| True if the player should dismount their vehicle.
 
  |}
 
  |}
  
Status can be one of seven values:
+
About the Flags field:
 +
 
 +
<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
  
 
{| class="wikitable"
 
{| class="wikitable"
! Meaning
 
! Value
 
 
  |-
 
  |-
  | Started digging
+
  ! Field
  | <code>0</code>
+
  ! Bit
 
  |-
 
  |-
  | Cancelled digging
+
  | X
  | <code>1</code>
+
  | 0x01
 
  |-
 
  |-
  | Finished digging
+
  | Y
  | <code>2</code>
+
  | 0x02
 
  |-
 
  |-
  | Drop item stack
+
  | Z
  | <code>3</code>
+
  | 0x04
|-
 
| Drop item
 
| <code>4</code>
 
|-
 
| Shoot arrow / finish eating
 
| <code>5</code>
 
|- style="background-color: #d9ead3;"
 
| Swap item in Hand
 
| <code>6</code>
 
|}
 
 
 
Notchian clients send a 0 (started digging) when they start digging and a 2 (finished digging) once they think they are finished. If digging is aborted, the client simply sends a 1 (cancel digging).
 
 
 
Status code 4 (drop item) is a special case. In-game, when you use the Drop Item command (keypress 'q'), a dig packet with a status of 4, 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.
 
 
 
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.
 
 
 
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"
 
 
  |-
 
  |-
! Value
+
  | Y_ROT
| 0
+
  | 0x08
| 1
 
| 2
 
| 3
 
  | 4
 
  | 5
 
 
  |-
 
  |-
! Offset
+
  | X_ROT
| -Y
+
  | 0x10
| +Y
 
| -Z
 
| +Z
 
  | -X
 
  | +X
 
 
  |}
 
  |}
  
==== {{Change||Use Item}} ====
+
==== Destroy Entity ====
  
Sent when pressing the Use Item key (default: right click) with an item in hand.
+
Sent by the server when {{change|a list of entities|an entity}} is to be destroyed on the client.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,345: Line 946:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x08
+
  |rowspan="4"| 0x36
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Server
+
  |rowspan="4"| Client
  | Hand
+
  |- {{removed}}
 +
| Count
 +
| VarInt
 +
| Number of elements in the following array.
 +
|- {{Removed}}
 +
| Array of VarInt
 +
| The list of entities of destroy.
 +
|- {{Added}}
 +
| Entity ID
 
  | VarInt
 
  | VarInt
| Hand used for the animation
 
 
  |}
 
  |}
  
==== Player Block Placement ====
+
==== Resource Pack Send ====  
  
 
{| class="wikitable"
 
{| class="wikitable"
|-
 
 
  ! Packet ID
 
  ! Packet ID
 
  ! State
 
  ! State
Line 1,364: Line 971:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="7"| {{Change|0x08|0x09}}
+
  |rowspan="4"| {{change|0x38|0x3B}}
  |rowspan="7"| Play
+
  |rowspan="4"| Play
  |rowspan="7"| Server
+
  |rowspan="4"| Client
  | Location
+
  | URL
  | Position
+
  | String (32767)
  | Block position
+
  | The URL to the resource pack.
 
  |-
 
  |-
  | Face
+
  | Hash
  | {{Change|Byte|VarInt}}
+
  | String (40)
| The face on which the block is placed (see above)
+
  | A 40 character hexadecimal and lowercase [[wikipedia:SHA-1|SHA-1]] hash of the resource pack file. (must be lower case in order to work)<br />If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
  |- style="background-color: #f4cccc; text-decoration: line-through;"
+
  |- {{Added}}
| Held Item
+
  | Forced
| [[Slot Data|Slot]]
+
  | Boolean
|
+
  | The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
|- style="background-color: #d9ead3;"
+
  |- {{Added}}
| Hand
+
  | Forced Message
| VarInt
+
  | [[Chat]]
| The hand from which the block is placed; 0: main hand, 1: off hand
+
  | This is sent with the force resourcepack popup.
  |-
 
  | Cursor Position X
 
  | Byte
 
  | The position of the crosshair on the block
 
  |-
 
  | Cursor Position Y
 
  | Byte
 
|
 
|-
 
| Cursor Position Z
 
| Byte
 
  |  
 
 
  |}
 
  |}
 
+
==== Title ====
In normal operation (i.e. placing a block), this packet is sent once, with the values set normally.
 
 
 
This packet has a special case where X, Y, Z, and Direction are all -1. (Note that Y is unsigned so set to 255.) This special packet indicates that the currently held item for the player should have its state updated such as eating food, pulling back bows, using buckets, etc.
 
 
 
Special note on using buckets: When using buckets, the Notchian client might send two packets: first a normal and then a special case. The first normal packet is sent when you're looking at a block (e.g. the water you want to scoop up). This normal packet does not appear to do anything with a Notchian server. The second, special case packet appears to perform the action — based on current position/orientation and with a distance check — it appears that buckets can only be used within a radius of 6 units.
 
 
 
==== Held Item Change ====
 
 
 
Sent when the player changes the slot selection.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,410: Line 996:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Removed }}
  |rowspan="1"| {{Change|0x09|0x0A}}
+
|rowspan="10"| 0x4F
  |rowspan="1"| Play
+
|rowspan="10"| Play
  |rowspan="1"| Server
+
  |rowspan="10"| Client
  | Slot
+
|colspan="2"| Action
  | Short
+
| VarInt Enum
  | The slot which the player has selected (0–8)
+
|
 +
|- {{ Removed }}
 +
! Action
 +
! Field Name
 +
!
 +
!
 +
|- {{ Removed }}
 +
| 0: set title
 +
| Title Text
 +
| [[Chat]]
 +
|  
 +
|- {{ Removed }}
 +
  | 1: set subtitle
 +
| Subtitle Text
 +
| [[Chat]]
 +
|
 +
|- {{ Removed }}
 +
| 2: set action bar
 +
| Action bar text
 +
| [[Chat]]
 +
| Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
 +
|- {{ Removed }}
 +
  |rowspan="3"| 3: set times and display
 +
| Fade In
 +
| Int
 +
| Ticks to spend fading in.
 +
|- {{ Removed }}
 +
  | Stay
 +
  | Int
 +
  | Ticks to keep the title displayed.
 +
|- {{ Removed }}
 +
| Fade Out
 +
| Int
 +
| Ticks to spend out, not when to start fading out.
 +
|- {{ Removed }}
 +
| 4: hide
 +
| ''no fields''
 +
| ''no fields''
 +
|
 +
|- {{ Removed }}
 +
| 5: reset
 +
| ''no fields''
 +
| ''no fields''
 +
|
 
  |}
 
  |}
  
==== Animation ====
+
“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.
  
Sent when the player's arm swings
+
The title is visible on screen for Fade In + Stay + Fade Out ticks.
 +
 
 +
==== Action Bar ====
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,433: Line 1,064:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="1"| {{Change|0x0A|0x0B}}
+
  |rowspan="4"| 0x40
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Server
+
  |rowspan="4"| Client
  |style="background-color: #d9ead3;"| Hand
+
  | Action bar text
  |style="background-color: #d9ead3;"| VarInt
+
| [[Chat]]
  |style="background-color: #d9ead3;"| Hand used for the animation
+
  | Displays a message above the hotbar (the same as position 2 in [[#Chat Message (clientbound)|Chat Message (clientbound)]].
 +
  |- {{ Added }}
 
  |}
 
  |}
 
+
==== World Border Center ====  
==== Entity Action ====
 
 
 
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.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,453: Line 1,082:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="3"| {{Change|0x0B|0x0C}}
+
  |rowspan="18"| 0x41
  |rowspan="3"| Play
+
  |rowspan="18"| Play
  |rowspan="3"| Server
+
  |rowspan="18"| Client
  | Entity ID
+
  | X
  | VarInt
+
  | Double
  | Player ID
+
  |  
  |-
+
  |- {{ Added }}
  | Action ID
+
  | Z
  | VarInt
+
  | Double
  | The ID of the action, see below
+
  |  
  |-
+
  |- {{ Added }}
| Jump Boost
 
| VarInt
 
| Horse jump boost. Ranged from 0 -> 100.
 
 
  |}
 
  |}
 
+
==== World Border Lerp Size ====  
Action ID can be one of the following values:
 
 
 
{| class="wikitable"
 
! ID
 
! Action
 
|-
 
| 0
 
| Crouch
 
|-
 
| 1
 
| Uncrouch
 
|-
 
| 2
 
| Leave bed
 
|-
 
| 3
 
| Start sprinting
 
|-
 
| 4
 
| Stop sprinting
 
|-
 
| 5
 
| Jump with horse
 
|- style="background-color: #f4cccc; text-decoration: line-through;"
 
| 6
 
| Open inventory
 
|}
 
 
 
"Open inventory" is sent via the [[#Client Status|Client Status]] packet.
 
 
 
==== Steer Vehicle ====
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,509: Line 1,104:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 +
|- {{ Added }}
 +
|rowspan="4"| 0x42
 +
|rowspan="4"| Play
 +
|rowspan="4"| Client
 +
| Old Diameter
 +
| Double
 +
| Current length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| New Diameter
 +
| Double
 +
| Target length of a single side of the world border, in meters.
 +
|- {{ Added }}
 +
| Speed
 +
| VarLong
 +
| Number of real-time ''milli''seconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
 
  |-
 
  |-
|rowspan="3"| {{Change|0x0C|0x0D}}
 
|rowspan="3"| Play
 
|rowspan="3"| Server
 
| Sideways
 
| Float
 
| Positive to the left of the player
 
|-
 
| Forward
 
| Float
 
| Positive forward
 
|-
 
| Flags
 
| Unsigned Byte
 
| Bit mask. 0x1: jump, 0x2: unmount
 
 
  |}
 
  |}
 
+
==== World Border Size ====  
==== Close Window ====
 
 
 
This packet is sent by the client when closing a window.
 
 
 
Note, Notchian clients send a close window message with Window ID 0 to close their inventory even though there is never an Open Window message for the inventory.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,539: Line 1,130:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  | {{Change|0x0D|0x0E}}
+
  |rowspan="4"| 0x43
  |rowspan="1"| Play
+
  |rowspan="4"| Play
  |rowspan="1"| Server
+
  |rowspan="4"| Client
  | Window ID
+
  | Diameter
  | Unsigned Byte
+
  | Double
  | This is the ID of the window that was closed. 0 for inventory.
+
  | Length of a single side of the world border, in meters.
 +
|- {{ Added }}
 
  |}
 
  |}
  
==== Click Window ====
+
==== World Border Warning Delay====  
 
 
This packet is sent by the player when it clicks on a slot in a window.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,559: Line 1,149:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="6"| {{Change|0x0E|0x0F}}
+
  |rowspan="4"| 0x44
  |rowspan="6"| Play
+
  |rowspan="4"| Play
  |rowspan="6"| Server
+
  |rowspan="4"| Client
| Window ID
+
  | Warning Time
  | Unsigned Byte
+
  | VarInt
  | The ID of the window which was clicked. 0 for player inventory.
+
  | In seconds as set by <code>/worldborder warning time</code>.
  |-
+
  |- {{ Added }}
| Slot
 
| Short
 
| The clicked slot number, see below
 
|-
 
| Button
 
| Byte
 
| The button used in the click, see below
 
|-
 
| Action Number
 
| Short
 
| A unique number for the action, implemented by Notchian as a counter, starting at 1. Used by the server to send back a [[Protocol#Confirm Transaction|Confirm Transaction]].
 
  |-
 
| Mode
 
| Byte
 
| Inventory operation mode, see below
 
|-
 
| Clicked item
 
| [[Slot Data|Slot]]
 
| The clicked slot. Has to be empty (item ID = -1) for drop mode.
 
 
  |}
 
  |}
  
See [[Inventory#Windows]] for further information about how slots are indexed.
+
==== World Border Warning Reach====  
 
 
When right-clicking on a stack of items, half the stack will be picked up and half left in the slot. If the stack is an odd number, the half left in the slot will be smaller of the amounts.
 
 
 
The distinct type of click performed by the client is determined by the combination of the Mode and Button fields.
 
 
 
{| class="wikitable"
 
! Mode
 
! Button
 
! Slot
 
! Trigger
 
|-
 
!rowspan="2"| 0
 
| 0
 
| Normal
 
| Left mouse click
 
|-
 
| 1
 
| Normal
 
| Right mouse click
 
|-
 
!rowspan="2"| 1
 
| 0
 
| Normal
 
| Shift + left mouse click
 
|-
 
| 1
 
| Normal
 
| Shift + right mouse click ''(identical behavior)''
 
|-
 
!rowspan="5"| 2
 
| 0
 
| Normal
 
| Number key 1
 
|-
 
| 1
 
| Normal
 
| Number key 2
 
|-
 
| 2
 
| Normal
 
| Number key 3
 
|-
 
| ⋮
 
| ⋮
 
| ⋮
 
|-
 
| 8
 
| Normal
 
| Number key 9
 
|-
 
!rowspan="1"| 3
 
| 2
 
| Normal
 
| Middle click
 
|-
 
!rowspan="4"| 4
 
| 0
 
| Normal*
 
| Drop key (Q) (* Clicked item is different, see above)
 
|-
 
| 1
 
| Normal*
 
| Ctrl + Drop key (Ctrl-Q) ''(drops full stack)''
 
|-
 
| 0
 
| -999
 
| Left click outside inventory holding nothing ''(no-op)''
 
|-
 
| 1
 
| -999
 
| Right click outside inventory holding nothing ''(no-op)''
 
|-
 
!rowspan="6"| 5
 
| 0
 
| -999
 
| Starting left mouse drag ''(or middle mouse)''
 
|-
 
| 4
 
| -999
 
| Starting right mouse drag
 
|-
 
| 1
 
| Normal
 
| Add slot for left-mouse drag
 
|-
 
| 5
 
| Normal
 
| Add slot for right-mouse drag
 
|-
 
| 2
 
| -999
 
| Ending left mouse drag
 
|-
 
| 6
 
| -999
 
| Ending right mouse drag
 
|-
 
! 6
 
| 0
 
| Normal
 
| Double click
 
|}
 
 
 
Starting from version 1.5, “painting mode” is available for use in inventory windows. It is done by picking up stack of something (more than 1 item), then holding mouse button (left, right or middle) and dragging held stack over empty (or same type in case of right button) slots. In that case client sends the following to server after mouse button release (omitting first pickup packet which is sent as usual):
 
 
 
# packet with mode 5, slot -999, button (0 for left | 4 for right);
 
# packet for every slot painted on, mode is still 5, button (1 | 5);
 
# packet with mode 5, slot -999, button (2 | 6);
 
 
 
If any of the painting packets other than the “progress” ones are sent out of order (for example, a start, some slots, then another start; or a left-click in the middle) the painting status will be reset.
 
 
 
The server will send back a [[#Confirm Transaction|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"
Line 1,714: Line 1,168:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="3"| {{Change|0x0F|0x10}}
+
  |rowspan="4"| 0x45
  |rowspan="3"| Play
+
  |rowspan="4"| Play
  |rowspan="3"| Server
+
  |rowspan="4"| Client
  | Window ID
+
  | Warning Blocks
  | Byte
+
  | VarInt
  | The ID of the window that the action occurred in
+
  | In meters.
|-
+
  |- {{ Added }}
| Action Number
 
| Short
 
| Every action that is to be accepted has a unique number. This field corresponds to that number.
 
  |-
 
| Accepted
 
| Boolean
 
| Whether the action was accepted
 
 
  |}
 
  |}
  
==== Creative Inventory Action ====
+
==== Set Title SubTitle ====  
 
 
While the user is in the standard inventory (i.e., not a crafting bench) in Creative mode, the player will send this packet.
 
 
 
Clicking in the creative inventory menu is quite different from non-creative inventory management. Picking up an item with the mouse actually deletes the item from the server, and placing an item into a slot or dropping it out of the inventory actually tells the server to create the item from scratch. (This can be verified by clicking an item that you don't mind deleting, then severing the connection to the server; the item will be nowhere to be found when you log back in.) As a result of this implementation strategy, the "Destroy Item" slot is just a client-side implementation detail that means "I don't intend to recreate this item.". Additionally, the long listings of items (by category, etc.) are a client-side interface for choosing which item to create. Picking up an item from such listings sends no packets to the server; only when you put it somewhere does it tell the server to create the item in that location.
 
 
 
This action can be described as “set inventory slot”. Picking up an item sets the slot to item ID -1. Placing an item into an inventory slot sets the slot to the specified item. Dropping an item (by clicking outside the window) effectively sets slot -1 to the specified item, which causes the server to spawn the item entity, etc.. All other inventory slots are numbered the same as the non-creative inventory (including slots for the 2×2 crafting menu, even though they aren't visible in the vanilla client).
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,746: Line 1,187:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="2"| {{Change|0x10|0x11}}
+
  |rowspan="4"| 0x56
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Server
+
  |rowspan="4"| Client
  | Slot
+
  | Subtitle Text
| Short
+
  | [[Chat]]
| Inventory slot
+
  |- {{ Added }}
|-
 
| Clicked Item
 
  | [[Slot Data|Slot]]
 
  |  
 
 
  |}
 
  |}
  
==== Enchant Item ====
+
 
 +
==== Set Title Text ====  
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,768: Line 1,206:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="2"| {{Change|0x11|0x12}}
+
  |rowspan="4"| 0x58
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Server
+
  |rowspan="4"| Client
  | Window ID
+
  | Title Text
  | Byte
+
  | [[Chat]]
| The ID of the enchantment table window sent by [[Protocol#Open Window|Open Window]]
+
  |- {{ Added }}
  |-
 
| Enchantment
 
| Byte
 
| The position of the enchantment on the enchantment table window, starting with 0 as the topmost one
 
 
  |}
 
  |}
  
==== Update Sign ====
+
==== Set Title Time====  
 
 
This message is sent from the client to the server when the “Done” button is pushed after placing a sign.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,792: Line 1,224:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Added }}
  |rowspan="5"| {{Change|0x12|0x13}}
+
  |rowspan="4"| 0x59
  |rowspan="5"| Play
+
  |rowspan="4"| Play
  |rowspan="5"| Server
+
  |rowspan="4"| Client
  | Location
+
  | Fade In
  | Position
+
  | Int
  | Block Coordinates
+
  | Ticks to spend fading in.
  |-
+
  |- {{ Added }}
| Line 1
+
  | Stay
| {{Change|[[Chat]]|String}}
+
  | Int
  | First line of text in the sign
+
  | Ticks to keep the title displayed.
|-
+
  |- {{ Added }}
| Line 2
+
  | Fade Out
  | {{Change|[[Chat]]|String}}
+
  | Int
  | Second line of text in the sign
+
  | Ticks to spend out, not when to start fading out.
  |-
 
| Line 3
 
| {{Change|[[Chat]]|String}}
 
  | Third line of text in the sign
 
|-
 
| Line 4
 
  | {{Change|[[Chat]]|String}}
 
  | Fourth line of text in the sign
 
 
  |}
 
  |}
  
==== Player Abilities ====
 
  
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.
+
==== Tags ====
 
 
The vanilla client sends this packet when the player starts/stops flying with the second parameter changed accordingly. All other parameters are ignored by the vanilla server.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,827: Line 1,248:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  ! Field Name
+
  !colspan="2"| Field Name
  ! Field Type
+
  !colspan="2"| Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x13|0x14}}
+
  |rowspan="8"| {{change|0x5B|0x65}}
  |rowspan="3"| Play
+
  |rowspan="8"| Play
  |rowspan="3"| Server
+
  |rowspan="8"| Client
  | Flags
+
  |- {{removed}}
  | Byte
+
  | colspan="2"| Block Tags
  | Bit mask. 0x08: damage disabled (god mode), 0x04: can fly, 0x02: is flying, 0x01: is Creative
+
  | colspan="2"| (See below)
  |-
+
| IDs are block IDs
  | Flying Speed
+
  |- {{removed}}
  | Float
+
  | colspan="2"| Item Tags
 +
  | colspan="2"| (See below)
 +
| IDs are item IDs
 +
|- {{removed}}
 +
| colspan="2"| Fluid Tags
 +
| colspan="2"| (See below)
 +
| IDs are fluid IDs
 +
|- {{removed}}
 +
| colspan="2"| Entity Tags
 +
| colspan="2"| (See below)
 +
| IDs are entity IDs
 +
|- {{added}}
 +
| colspan="2"| Length of the array
 +
| colspan="2"| VarInt
 
  |  
 
  |  
 +
|- {{added}}
 +
|rowspan="2"| Array of tags
 +
| Tag type
 +
|rowspan="2"| Array
 +
| Identifier
 +
| Tag identifier (Vanilla required tags are <code>minecraft:block</code>, <code>minecraft:item</code>, <code>minecraft:fluid</code>, <code>minecraft:entity_type</code>, and <code>minecraft:game_event</code>)
 
  |-
 
  |-
  | Walking Speed
+
  | Array of Tag
  | Float
+
  | (See below)
  |  
+
  |
 
  |}
 
  |}
  
==== Tab-Complete ====
+
Tags look like:
 
 
Sent when the user presses ''tab'' while writing text.
 
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  !colspan="2"| Field Name
! State
+
  !colspan="2"| Field Type
! Bound To
 
! Field Name
 
  ! Field Type
 
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x14|0x15}}
+
  |colspan="2"| Length
  |rowspan="3"| Play
+
|colspan="2"| VarInt
  |rowspan="3"| Server
+
| Number of elements in the following array
  | Text
+
|-
  | String
+
  |rowspan="3"| Tags
| All text behind the cursor
+
| Tag name
 +
  |rowspan="3"| Array
 +
  | Identifier
 +
  |
 
  |-
 
  |-
  | Has Position
+
  | Count
  | Boolean
+
  | VarInt
  |  
+
  | Number of elements in the following array
 
  |-
 
  |-
  | Looked At Block
+
  | Entries
  | Optional Position
+
  | Array of VarInt
  | The position of the block being looked at. Only sent if Has Position is true
+
  | Numeric ID of the given type (block, item, etc.).
 
  |}
 
  |}
 +
 +
 +
=== Serverbound ===
  
 
==== Client Settings ====
 
==== Client Settings ====
Line 1,887: Line 1,328:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="6"| {{Change|0x15|0x16}}
+
  |rowspan="7"| 0x05
  |rowspan="6"| Play
+
  |rowspan="7"| Play
  |rowspan="6"| Server
+
  |rowspan="7"| Server
 
  | Locale
 
  | Locale
  | String
+
  | String (16)
  | e.g. en_GB
+
  | e.g. <code>en_GB</code>.
 
  |-
 
  |-
 
  | View Distance
 
  | View Distance
 
  | Byte
 
  | Byte
  | Client-side render distance, in chunks
+
  | Client-side render distance, in chunks.
 
  |-
 
  |-
 
  | Chat Mode
 
  | Chat Mode
  | {{Change|Byte|VarInt}}
+
  | VarInt Enum
  | 0: enabled, 1: commands only, 2: hidden
+
  | 0: enabled, 1: commands only, 2: hidden.  See [[Chat#Processing chat|processing chat]] for more information.
 
  |-
 
  |-
 
  | Chat Colors
 
  | Chat Colors
 
  | Boolean
 
  | Boolean
  | “Colors” multiplayer setting
+
  | “Colors” multiplayer setting.
 
  |-
 
  |-
 
  | Displayed Skin Parts
 
  | Displayed Skin Parts
 
  | Unsigned Byte
 
  | Unsigned Byte
  | Skin parts, see note below
+
  | Bit mask, see below.
  |- style="background-color: #d9ead3;"
+
  |-
 
  | Main Hand
 
  | Main Hand
  | VarInt
+
  | VarInt Enum
  | 0: Left, 1: Right
+
  | 0: Left, 1: Right.
 +
|- {{Added}}
 +
| Disable text filtering
 +
| Boolean
 +
| Disables filtering of text on signs and written book titles.  Currently always true (i.e. the filtering is disabled)
 
  |}
 
  |}
  
Line 1,927: Line 1,372:
 
The most significant bit (bit 7, 0x80) appears to be unused.
 
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.
+
==== Window Confirmation (serverbound) ====
 +
 
 +
If a confirmation sent by the client was not accepted, the server will reply with a [[#Window Confirmation (clientbound)|Window Confirmation (clientbound)]] packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,938: Line 1,384:
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
  |-
+
  |- {{ Removed }}
  |rowspan="1"| {{Change|0x16|0x17}}
+
  |rowspan="3"| 0x07
  |rowspan="1"| Play
+
  |rowspan="3"| Play
  |rowspan="1"| Server
+
  |rowspan="3"| Server
  | Action ID
+
| Window ID
  | VarInt
+
| Byte
  | See below
+
| The ID of the window that the action occurred in.
 +
|- {{ Removed }}
 +
  | Action Number
 +
| Short
 +
| Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
 +
|- {{ Removed }}
 +
| Accepted
 +
  | Boolean
 +
  | Whether the action was accepted.
 
  |}
 
  |}
 +
== Handshaking ==
  
''Action ID'' values:
+
=== Clientbound ===
 
 
{| class="wikitable"
 
|-
 
! Action ID
 
! Action
 
|-
 
| 0
 
| Perform respawn
 
|-
 
| 1
 
| Request stats
 
|-
 
| 2
 
| {{Change|''Taking Inventory'' achievement|Open Inventory}}
 
|}
 
  
==== Plugin Message ====
+
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.
  
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>.
+
=== Serverbound ===
  
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/]
+
==== Handshake ====
  
Note that the data length is known from the packet length, so there is no need for a length member being sent.
+
This causes the server to switch into the target state.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 1,980: Line 1,420:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| {{Change|0x17|0x18}}
+
  |rowspan="4"| 0x00
  |rowspan="2"| Play
+
  |rowspan="4"| Handshaking
  |rowspan="2"| Server
+
  |rowspan="4"| Server
  | Channel
+
  | Protocol Version
  | String
+
  | VarInt
  | Name of the [[plugin channel]] used to send the data
+
  | See [[protocol version numbers]] (currently {{change|754|{{Snapshot PVN|1073741839}}}})
 
  |-
 
  |-
  | Data
+
  | Server Address
| Byte Array
 
| Any data, depending on the channel. <code><nowiki>MC|</nowiki></code> channels are documented [[plugin channel|here]].
 
|}
 
 
 
==== Spectate ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="1"| {{Change|0x18|0x19}}
 
|rowspan="1"| Play
 
|rowspan="1"| Server
 
| Target Player
 
| UUID
 
|
 
|}
 
 
 
==== Resource Pack Status ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
! Field Name
 
! Field Type
 
! Notes
 
|-
 
|rowspan="2"| {{Change|0x19|0x1A}}
 
|rowspan="2"| Play
 
|rowspan="2"| Server
 
| Hash
 
 
  | String
 
  | 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 {{change|complete|simple}} redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide {{change|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 2,051: Line 1,459:
  
 
No changes so far.
 
No changes so far.
 +
 +
 +
[[Category:Minecraft Modern]]

Latest revision as of 00:58, 14 May 2021

This page documents the changes from the last stable Minecraft release (currently 1.16.5, protocol 754) to the current pre-release (currently 21w07a, protocol Snapshot 15). Note that this page contains bleeding-edge information that may not be completely or correctly documented.

One who wishes to commandeer the merging of this into Protocol when an update is made must be sure to respect any changes that may have occurred to the respective packets there.

Contents

Data types

No changes so far.

Packets

ID Packet name Documentation
Play clientbound
0x05 Sculk Vibration Signal Pre
0x05 0x06 Entity Animation (clientbound) Current (unchanged)
0x06 0x07 Statistics Current (unchanged)
0x07 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Block Entity Data Current (unchanged)
0x0A 0x0B Block Action Current (unchanged)
0x0B 0x0C Block Change Current (unchanged)
0x0C 0x0D Boss Bar Current (unchanged)
0x0D 0x0E Server Difficulty Current (unchanged)
0x0E 0x0F Chat Message (clientbound) Current (unchanged)
0x10 Clear Titles Pre
0x0F 0x11 Tab-Complete (clientbound) Current (unchanged)
0x10 0x12 Declare Commands Current (unchanged)
0x11 Window Confirmation (clientbound) Current
0x12 0x13 Close Window (clientbound) Current (unchanged)
0x13 0x14 Window Items Current (unchanged)
0x14 0x15 Window Property Current (unchanged)
0x15 0x16 Set Slot Current (unchanged)
0x16 0x17 Set Cooldown Current (unchanged)
0x17 0x18 Plugin Message (clientbound) Current (unchanged)
0x18 0x19 Named Sound Effect Current (unchanged)
0x19 0x1A Disconnect (play) Current (unchanged)
0x1A 0x1B Entity Status Current (unchanged)
0x1B 0x1C Explosion Current (unchanged)
0x1C 0x1D Unload Chunk Current (unchanged)
0x1D 0x1E Change Game State Current (unchanged)
0x1E 0x1F Open Horse Window Current (unchanged)
0x20 Initialize World Border Pre
0x1F 0x21 Keep Alive (clientbound) Current (unchanged)
0x20 0x22 Chunk Data Current Pre
0x21 0x23 Effect Current (unchanged)
0x22 0x24 Particle Current (unchanged)
0x23 0x25 Update Light Current Pre
0x24 0x26 Join Game Current (unchanged)
0x25 0x27 Map Data Current Pre
0x26 0x28 Trade List Current (unchanged)
0x27 0x29 Entity Position Current (unchanged)
0x28 0x2A Entity Position and Rotation Current (unchanged)
0x29 0x2B Entity Rotation Current (unchanged)
0x2A Entity Movement Current
0x2B 0x2C Vehicle Move (clientbound) Current (unchanged)
0x2C 0x2D Open Book Current (unchanged)
0x2D 0x2E Open Window Current (unchanged)
0x2E 0x2F Open Sign Editor Current (unchanged)
0x2F 0x30 Craft Recipe Response Current (unchanged)
0x30 0x31 Player Abilities (clientbound) Current (unchanged)
0x31 Combat Event Current
0x32 End Combat Event Pre
0x33 Enter Combat Event Pre
0x34 Death Combat Event Pre
0x32 0x35 Player Info Current (unchanged)
0x33 0x36 Face Player Current (unchanged)
0x36 Destroy Entities Current Pre|rel=removed}}
0x34 0x37 Player Position And Look (clientbound) Current Pre
0x35 0x38 Unlock Recipes Current (unchanged)
0x39 Destroy Entity Current Pre|rel=added}}
0x37 0x3A Remove Entity Effect Current (unchanged)
0x38 0x3B Resource Pack Send Current Pre
0x39 0x3C Respawn Current (unchanged)
0x3A 0x3D Entity Head Look Current (unchanged)
0x3B 0x3E Multi Block Change Current (unchanged)
0x3C 0x3F Select Advancement Tab Current (unchanged)
0x40 Action Bar Pre
0x41 World Border Center Pre
0x42 World Border Lerp Size Pre
0x43 World Border Size Pre
0x44 World Border Warning Delay Pre
0x45 World Border Warning Reach Pre
0x3E 0x46 Camera Current (unchanged)
0x3F 0x47 Held Item Change (clientbound) Current (unchanged)
0x40 0x48 Update View Position Current (unchanged)
0x41 0x49 Update View Distance Current (unchanged)
0x42 0x4A Spawn Position Current (unchanged)
0x43 0x4B Display Scoreboard Current (unchanged)
0x44 0x4C Entity Metadata Current (unchanged)
0x45 0x4D Attach Entity Current (unchanged)
0x46 0x4E Entity Velocity Current (unchanged)
0x47 0x4F Entity Equipment Current (unchanged)
0x4F Title Current Pre
0x48 0x50 Set Experience Current (unchanged)
0x49 0x51 Update Health Current (unchanged)
0x4A 0x52 Scoreboard Objective Current (unchanged)
0x4B 0x53 Set Passengers Current (unchanged)
0x4C 0x54 Teams Current (unchanged)
0x4D 0x55 Update Score Current (unchanged)
0x56 Set Title SubTitle Pre
0x57 Time Update Current (unchanged)
0x58 Set Title Text Pre
0x59 Set Title Time Pre
0x50 0x5A Entity Sound Effect Current (unchanged)
0x51 0x5B Sound Effect Current (unchanged)
0x52 0x5C Stop Sound Current (unchanged)
0x53 0x5D Player List Header And Footer Current (unchanged)
0x54 0x5E NBT Query Response Current (unchanged)
0x55 0x5F Collect Item Current (unchanged)
0x56 0x60 Entity Teleport Current (unchanged)
0x57 0x61 Advancements Current (unchanged)
0x58 0x62 Entity Properties Current (unchanged)
0x59 0x63 Entity Effect Current (unchanged)
0x5A 0x64 Declare Recipes Current (unchanged)
0x5B 0x65 Tags Current Pre
Play serverbound
0x05 Client Settings Current Pre
Handshaking serverbound
0x00 Handshake Current Pre

New/modified data types

No changes so far.

Entity Metadata

Warning.png Note that other entities have had metadata shifts due to these changes, not shown here.

Entity

The base class.

Index Type Meaning Default
0 Byte Bit mask Meaning 0
0x01 Is on fire
0x02 Is crouching
0x04 Unused (previously riding)
0x08 Is sprinting
0x10 Is swimming
0x20 Is invisible
0x40 has glowing effect
0x80 Is flying with an elytra
1 VarInt Air ticks 300
2 OptChat Custom name empty
3 Boolean Is custom name visible false
4 Boolean Is silent false
5 Boolean Has no gravity false
6 Pose Pose STANDING
7 VarInt Ticks frozen in powdered snow 0

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Sculk Vibration Signal

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Source Position Position Source position for the vibration.
Destination Identifier Identifier Identifier of the destination codec type.
Destination Varies Vanilla default destinations are a block position encoded as a Position for "block" or an entity id encoded as a VarInt for "entity".
Arrival Ticks VarInt Ticks for the signal to arrive at the destination.

This packet shows a permanent particle.

Clear Titles

Packet ID State Bound To Field Name Field Type Notes
0x10 Play Client
Reset Boolean

Initialize World Border

Packet ID State Bound To Field Name Field Type Notes
0x20 Play Client X Double
Z Double
Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.
Portal Teleport Boundary VarInt Resulting coordinates from a portal teleport are limited to ±value. Usually 29999984.
Warning Blocks VarInt In meters.
Warning Time VarInt In seconds as set by /worldborder warning time.

The Notchian client determines how solid to display the warning by comparing to whichever is higher, the warning distance or whichever is lower, the distance from the current diameter to the target diameter or the place the border will be after warningTime seconds. In pseudocode:

distance = max(min(resizeSpeed * 1000 * warningTime, abs(targetDiameter - currentDiameter)), warningDistance);
if (playerDistance < distance) {
    warning = 1.0 - playerDistance / distance;
} else {
    warning = 0.0;
}

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 dimension 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
0x20 0x22 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).
Bit Mask Length VarInt Length of the following array
Primary Bit Mask Array of Long BitSet with bits (world height in blocks / 16) 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 the lowest y to 15 blocks above).
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; should always be 1024. Not present if full chunk is false.
Biomes Optional Array of VarInt 1024 biome IDs, ordered by x then z then y, in 4×4×4 blocks. Not present if full chunk is false. See Chunk Format § Biomes.
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

Entity Movement

This packet may be used to initialize an entity.

For player entities, either this packet or any move/look packet is sent every game tick. So the meaning of this packet is basically that the entity did not move/look since the last such packet.

Packet ID State Bound To Field Name Field Type Notes
0x2A Play Client Entity ID VarInt

Update Light

Updates light levels for a chunk.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x25 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.
Length 1 VarInt Length of the following array
Sky Light Mask Array of Long BitSet containing bits for each sections in the world + 2 (lowest bit 16-1 blocks below min world height, highest 1-16 above max world height)
Length 2 VarInt Length of the following array
Block Light Mask Array of Long BitSet containing bits for each sections in the world + 2, same order as sky light
Length 3 VarInt Length of the following array
Empty Sky Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their sky light values
Length 4 VarInt Length of the following array
Empty Block Light Mask Array of Long BitSet containing a variable amount of bits (see sky/block light) which indicates sections that have 0 for all their block light values
Sky Light array count VarInt Number of entries in the following array
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 array count VarInt Number of entries in the following array
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.


Map Data

Updates a rectangular area on a map item.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x27 Play Client Map ID VarInt Map ID of the map being modified
Scale Byte From 0 for a fully zoomed-in map (1 block per pixel) to 4 for a fully zoomed-out map (16 blocks per pixel)
Tracking Position Boolean Specifies whether player and item frame icons are shown
Locked Boolean True if the map has been locked in a cartography table
Tracking Position Boolean Specifies whether player and item frame icons are shown
Icon Count VarInt Number of elements in the following array. Only present if "Tracking Position" is true.
Icon Type Array VarInt enum See below
X Byte Map coordinates: -128 for furthest left, +127 for furthest right
Z Byte Map coordinates: -128 for highest, +127 for lowest
Direction Byte 0-15
Has Display Name Boolean
Display Name Optional Chat Only present if previous Boolean is true
Columns Unsigned Byte Number of columns updated
Rows Optional Byte Only if Columns is more than 0; number of rows updated
X Optional Byte Only if Columns is more than 0; x offset of the westernmost column
Z Optional Byte Only if Columns is more than 0; z offset of the northernmost row
Length Optional VarInt Only if Columns is more than 0; length of the following array
Data Optional Array of Unsigned Byte Only if Columns is more than 0; see Map item format

For icons, a direction of 0 is a vertical icon and increments by 22.5° (360/16).

Types are based off of rows and columns in map_icons.png:

Icon type Result
0 White arrow (players)
1 Green arrow (item frames)
2 Red arrow
3 Blue arrow
4 White cross
5 Red pointer
6 White circle (off-map players)
7 Small white circle (far-off-map players)
8 Mansion
9 Temple
10 White Banner
11 Orange Banner
12 Magenta Banner
13 Light Blue Banner
14 Yellow Banner
15 Lime Banner
16 Pink Banner
17 Gray Banner
18 Light Gray Banner
19 Cyan Banner
20 Purple Banner
21 Blue Banner
22 Brown Banner
23 Green Banner
24 Red Banner
25 Black Banner
26 Treasure marker

Combat Event

Originally used for metadata for twitch streaming circa 1.8. Now only used to display the game over screen (with enter combat and end combat completely ignored by the Notchain client)

Packet ID State Bound To Field Name Field Type Notes
0x31 Play Client Event VarInt Enum Determines the layout of the remaining packet.
Event Field Name
0: enter combat no fields no fields
1: end combat Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.
2: entity dead Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

End Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x32 Play Client Duration VarInt Length of the combat in ticks.
Entity ID Int ID of the primary opponent of the ended combat, or -1 if there is no obvious primary opponent.

Enter Combat Event

Unused by the Notchain client.

Packet ID State Bound To Field Name Field Type Notes
0x33 Play Client


Death Combat Event

Used to send a respawn screen.

Packet ID State Bound To Field Name Field Type Notes
0x34 Play Client Player ID VarInt Entity ID of the player that died (should match the client's entity ID).
Entity ID Int The killing entity's ID, or -1 if there is no obvious killer.
Message Chat The death message.

Player Position And Look (clientbound)

Updates the player's position on the server. This packet will also close the “Downloading Terrain” screen when joining/respawning.

If the distance between the last known position of the player on the server and the new position set by this packet is greater than 100 meters, the client will be kicked for “You moved too quickly :( (Hacking?)”.

Also if the fixed-point number of X or Z is set greater than 3.2E7D the client will be kicked for “Illegal position”.

Yaw is measured in degrees, and does not follow classical trigonometry rules. The unit circle of yaw on the XZ-plane starts at (0, 1) and turns counterclockwise, with 90 at (-1, 0), 180 at (0, -1) and 270 at (1, 0). Additionally, yaw is not clamped to between 0 and 360 degrees; any number is valid, including negative numbers and numbers greater than 360.

Pitch is measured in degrees, where 0 is looking straight ahead, -90 is looking straight up, and 90 is looking straight down.

Packet ID State Bound To Field Name Field Type Notes
0x34 0x38 Play Client X Double Absolute or relative position, depending on Flags.
Y Double Absolute or relative position, depending on Flags.
Z Double Absolute or relative position, depending on Flags.
Yaw Float Absolute or relative rotation on the X axis, in degrees.
Pitch Float Absolute or relative rotation on the Y axis, in degrees.
Flags Byte Bit field, see below.
Teleport ID VarInt Client should confirm this packet with Teleport Confirm containing the same Teleport ID.
Dismount Vehicle Boolean True if the player should dismount their vehicle.

About the Flags field:

<Dinnerbone> It's a bitfield, X/Y/Z/Y_ROT/X_ROT. If X is set, the x value is relative and not absolute.
Field Bit
X 0x01
Y 0x02
Z 0x04
Y_ROT 0x08
X_ROT 0x10

Destroy Entity

Sent by the server when a list of entities an entity is to be destroyed on the client.

Packet ID State Bound To Field Name Field Type Notes
0x36 Play Client
Count VarInt Number of elements in the following array.
Array of VarInt The list of entities of destroy.
Entity ID VarInt

Resource Pack Send

Packet ID State Bound To Field Name Field Type Notes
0x38 0x3B Play Client URL String (32767) The URL to the resource pack.
Hash String (40) A 40 character hexadecimal and lowercase SHA-1 hash of the resource pack file. (must be lower case in order to work)
If it's not a 40 character hexadecimal string, the client will not use it for hash verification and likely waste bandwidth — but it will still treat it as a unique id
Forced Boolean The notchian client will be forced to use the resource pack from the server. If they decline they will be kicked from the server.
Forced Message Chat This is sent with the force resourcepack popup.

Title

Packet ID State Bound To Field Name Field Type Notes
0x4F Play Client Action VarInt Enum
Action Field Name
0: set title Title Text Chat
1: set subtitle Subtitle Text Chat
2: set action bar Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).
3: set times and display Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.
4: hide no fields no fields
5: reset no fields no fields

“Hide” makes the title disappear, but if you run times again the same title will appear. “Reset” erases the text.

The title is visible on screen for Fade In + Stay + Fade Out ticks.

Action Bar

Packet ID State Bound To Field Name Field Type Notes
0x40 Play Client Action bar text Chat Displays a message above the hotbar (the same as position 2 in Chat Message (clientbound).

World Border Center

Packet ID State Bound To Field Name Field Type Notes
0x41 Play Client X Double
Z Double

World Border Lerp Size

Packet ID State Bound To Field Name Field Type Notes
0x42 Play Client Old Diameter Double Current length of a single side of the world border, in meters.
New Diameter Double Target length of a single side of the world border, in meters.
Speed VarLong Number of real-time milliseconds until New Diameter is reached. It appears that Notchian server does not sync world border speed to game ticks, so it gets out of sync with server lag. If the world border is not moving, this is set to 0.

World Border Size

Packet ID State Bound To Field Name Field Type Notes
0x43 Play Client Diameter Double Length of a single side of the world border, in meters.

World Border Warning Delay

Packet ID State Bound To Field Name Field Type Notes
0x44 Play Client Warning Time VarInt In seconds as set by /worldborder warning time.

World Border Warning Reach

Packet ID State Bound To Field Name Field Type Notes
0x45 Play Client Warning Blocks VarInt In meters.

Set Title SubTitle

Packet ID State Bound To Field Name Field Type Notes
0x56 Play Client Subtitle Text Chat


Set Title Text

Packet ID State Bound To Field Name Field Type Notes
0x58 Play Client Title Text Chat

Set Title Time

Packet ID State Bound To Field Name Field Type Notes
0x59 Play Client Fade In Int Ticks to spend fading in.
Stay Int Ticks to keep the title displayed.
Fade Out Int Ticks to spend out, not when to start fading out.


Tags

Packet ID State Bound To Field Name Field Type Notes
0x5B 0x65 Play Client
Block Tags (See below) IDs are block IDs
Item Tags (See below) IDs are item IDs
Fluid Tags (See below) IDs are fluid IDs
Entity Tags (See below) IDs are entity IDs
Length of the array VarInt
Array of tags Tag type Array Identifier Tag identifier (Vanilla required tags are minecraft:block, minecraft:item, minecraft:fluid, minecraft:entity_type, and minecraft:game_event)
Array of Tag (See below)

Tags look like:

Field Name Field Type Notes
Length VarInt Number of elements in the following array
Tags Tag name Array Identifier
Count VarInt Number of elements in the following array
Entries Array of VarInt Numeric ID of the given type (block, item, etc.).


Serverbound

Client Settings

Sent when the player connects, or when settings are changed.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Server Locale String (16) e.g. en_GB.
View Distance Byte Client-side render distance, in chunks.
Chat Mode VarInt Enum 0: enabled, 1: commands only, 2: hidden. See processing chat for more information.
Chat Colors Boolean “Colors” multiplayer setting.
Displayed Skin Parts Unsigned Byte Bit mask, see below.
Main Hand VarInt Enum 0: Left, 1: Right.
Disable text filtering Boolean Disables filtering of text on signs and written book titles. Currently always true (i.e. the filtering is disabled)

Displayed Skin Parts flags:

  • Bit 0 (0x01): Cape enabled
  • Bit 1 (0x02): Jacket enabled
  • Bit 2 (0x04): Left Sleeve enabled
  • Bit 3 (0x08): Right Sleeve enabled
  • Bit 4 (0x10): Left Pants Leg enabled
  • Bit 5 (0x20): Right Pants Leg enabled
  • Bit 6 (0x40): Hat enabled

The most significant bit (bit 7, 0x80) appears to be unused.


Window Confirmation (serverbound)

If a confirmation sent by the client was not accepted, the server will reply with a Window Confirmation (clientbound) packet with the Accepted field set to false. When this happens, the client must send this packet to apologize (as with movement), otherwise the server ignores any successive confirmations.

Packet ID State Bound To Field Name Field Type Notes
0x07 Play Server Window ID Byte The ID of the window that the action occurred in.
Action Number Short Every action that is to be accepted has a unique number. This number is an incrementing integer (starting at 1) with separate counts for each window ID.
Accepted Boolean Whether the action was accepted.

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 754 Snapshot 15)
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 simple 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

No changes so far.

Serverbound

No changes so far.