Difference between revisions of "Pre-release protocol"

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This page documents the changes from the [[Protocol|last stable Minecraft release]] (currently [[Protocol version numbers|1.11.2, protocol 316]]) to the current pre-release (currently [[Protocol version numbers|1.12-pre4, protocol 331]]). 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|1.14.4, protocol 498]]) to the current pre-release (currently [[Protocol version numbers|1.15-pre6, protocol 571]]). Note that this page contains bleeding-edge information that may not be completely or correctly documented.
  
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
 
One who wishes to commandeer the merging of this into [[Protocol]] when an update is made must be sure to respect any changes that may have occurred to the respective packets there.
Line 18: Line 18:
 
  !colspan="2"| Documentation
 
  !colspan="2"| Documentation
 
  |-
 
  |-
!colspan="4"| Handshaking serverbound
+
!colspan="4"| Handshaking serverbound
{{PacketList|0x00|Handshake}}
+
{{PacketList|0x00|Handshake}}
 
  |-
 
  |-
!colspan="4"| Play clientbound
+
!colspan="4"| Play clientbound
{{PacketList|0x08|Advancements|rel=added}}
+
{{PacketList|0x03|Spawn Mob}}
{{PacketList|{{Change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
+
{{PacketList|0x05|Spawn Player}}
{{PacketList|{{Change|0x09|0x0A}}|Update Block Entity}}
+
{{PacketList|{{change|0x5C|0x08}}|Acknowledge Player Digging|pre=unchanged}}
{{PacketList|{{Change|0x0A|0x0B}}|Block Action|pre=unchanged}}
+
{{PacketList|{{change|0x08|0x09}}|Block Break Animation|pre=unchanged}}
{{PacketList|{{Change|0x0B|0x0C}}|Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x09|0x0A}}|Update Block Entity}}
{{PacketList|{{Change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
+
{{PacketList|{{change|0x0A|0x0B}}|Block Action|pre=unchanged}}
{{PacketList|{{Change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
+
{{PacketList|{{change|0x0B|0x0C}}|Block Change|pre=unchanged}}
{{PacketList|{{Change|0x0E|0x0F}}|Tab-Complete (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0C|0x0D}}|Boss Bar|pre=unchanged}}
{{PacketList|{{Change|0x0F|0x10}}|Chat Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0D|0x0E}}|Server Difficulty|pre=unchanged}}
{{PacketList|{{Change|0x10|0x11}}|Multi Block Change|pre=unchanged}}
+
{{PacketList|{{change|0x0E|0x0F}}|Chat Message (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x11|0x12}}|Confirm Transation (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x0F|0x10}}|Multi Block Change|pre=unchanged}}
{{PacketList|{{Change|0x12|0x13}}|Close Window (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x10|0x11}}|Tab-Complete (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x13|0x14}}|Open Window|pre=unchanged}}
+
{{PacketList|{{change|0x11|0x12}}|Declare Commands|pre=unchanged}}
{{PacketList|{{Change|0x14|0x15}}|Window Items|pre=unchanged}}
+
{{PacketList|{{change|0x12|0x13}}|Confirm Transaction (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x15|0x16}}|Window Property|pre=unchanged}}
+
{{PacketList|{{change|0x13|0x14}}|Close Window (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x16|0x17}}|Set Slot|pre=unchanged}}
+
{{PacketList|{{change|0x14|0x15}}|Window Items|pre=unchanged}}
{{PacketList|{{Change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
+
{{PacketList|{{change|0x15|0x16}}|Window Property|pre=unchanged}}
{{PacketList|{{Change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x16|0x17}}|Set Slot|pre=unchanged}}
{{PacketList|{{Change|0x19|0x1A}}|Named Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x17|0x18}}|Set Cooldown|pre=unchanged}}
{{PacketList|{{Change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
+
{{PacketList|{{change|0x18|0x19}}|Plugin Message (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
+
{{PacketList|{{change|0x19|0x1A}}|Named Sound Effect|pre=unchanged}}
{{PacketList|{{Change|0x1C|0x1D}}|Explosion|pre=unchanged}}
+
{{PacketList|{{change|0x1A|0x1B}}|Disconnect (play)|pre=unchanged}}
{{PacketList|{{Change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
+
{{PacketList|{{change|0x1B|0x1C}}|Entity Status|pre=unchanged}}
{{PacketList|{{Change|0x1E|0x1F}}|Change Game State|pre=unchanged}}
+
{{PacketList|{{change|0x1C|0x1D}}|Explosion|pre=unchanged}}
{{PacketList|{{Change|0x1F|0x20}}|Keep Alive (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x1D|0x1E}}|Unload Chunk|pre=unchanged}}
{{PacketList|{{Change|0x20|0x21}}|Chunk Data|pre=unchanged}}
+
{{PacketList|{{change|0x1E|0x1F}}|Change Game State|pre=unchanged}}
{{PacketList|{{Change|0x21|0x22}}|Effect|pre=unchanged}}
+
{{PacketList|{{change|0x1F|0x20}}|Open Horse Window|pre=unchanged}}
{{PacketList|{{Change|0x22|0x23}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x20|0x21}}|Keep Alive (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x23|0x24}}|Join Game|pre=unchanged}}
+
{{PacketList|{{change|0x21|0x22}}|Chunk Data}}
{{PacketList|{{Change|0x24|0x25}}|Particle|pre=unchanged}}
+
{{PacketList|{{change|0x22|0x23}}|Effect|pre=unchanged}}
{{PacketList|{{Change|0x25|0x26}}|Entity Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x23|0x24}}|Particle}}
{{PacketList|{{Change|0x26|0x27}}|Entity Look And Relative Move|pre=unchanged}}
+
{{PacketList|{{change|0x24|0x25}}|Update Light|pre=unchanged}}
{{PacketList|{{Change|0x27|0x28}}|Entity Look|pre=unchanged}}
+
{{PacketList|{{change|0x25|0x26}}|Join Game}}
{{PacketList|{{Change|0x28|0x29}}|Entity|pre=unchanged}}
+
{{PacketList|{{change|0x26|0x27}}|Map Data|pre=unchanged}}
{{PacketList|{{Change|0x29|0x2A}}|Vehicle Move (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x27|0x28}}|Trade List|pre=unchanged}}
{{PacketList|{{Change|0x2A|0x2B}}|Open Sign Editor|pre=unchanged}}
+
{{PacketList|{{change|0x28|0x29}}|Entity Relative Move|pre=unchanged}}
{{PacketList|{{Change|0x2B|0x2C}}|Player Abilities (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x29|0x2A}}|Entity Look And Relative Move|pre=unchanged}}
{{PacketList|{{Change|0x2C|0x2D}}|Combat Event|pre=unchanged}}
+
{{PacketList|{{change|0x2A|0x2B}}|Entity Look|pre=unchanged}}
{{PacketList|{{Change|0x2D|0x2E}}|Player List Item|pre=unchanged}}
+
{{PacketList|{{change|0x2B|0x2C}}|Entity|pre=unchanged}}
{{PacketList|{{Change|0x2E|0x2F}}|Player Position And Look (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x2C|0x2D}}|Vehicle Move (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x2F|0x30}}|Use Bed|pre=unchanged}}
+
{{PacketList|{{change|0x2D|0x2E}}|Open Book|pre=unchanged}}
{{PacketList|0x31|Unlock Recipes|rel=added}}
+
{{PacketList|{{change|0x2E|0x2F}}|Open Window|pre=unchanged}}
{{PacketList|{{Change|0x30|0x32}}|Destroy Entities|pre=unchanged}}
+
{{PacketList|{{change|0x2F|0x30}}|Open Sign Editor|pre=unchanged}}
{{PacketList|{{Change|0x31|0x33}}|Remove Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x30|0x31}}|Craft Recipe Response|pre=unchanged}}
{{PacketList|{{Change|0x32|0x34}}|Resource Pack Send|pre=unchanged}}
+
{{PacketList|{{change|0x31|0x32}}|Player Abilities (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x33|0x35}}|Respawn|pre=unchanged}}
+
{{PacketList|{{change|0x32|0x33}}|Combat Event|pre=unchanged}}
{{PacketList|{{Change|0x34|0x36}}|Entity Head Look|pre=unchanged}}
+
{{PacketList|{{change|0x33|0x34}}|Player Info|pre=unchanged}}
{{PacketList|{{Change|0x35|0x37}}|World Border|pre=unchanged}}
+
{{PacketList|{{change|0x34|0x35}}|Face Player|pre=unchanged}}
{{PacketList|{{Change|0x36|0x38}}|Camera|pre=unchanged}}
+
{{PacketList|{{change|0x35|0x36}}|Player Position And Look (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x37|0x39}}|Held Item Change (clientbound)|pre=unchanged}}
+
{{PacketList|{{change|0x36|0x37}}|Unlock Recipes|pre=unchanged}}
{{PacketList|{{Change|0x38|0x3A}}|Display Scoreboard|pre=unchanged}}
+
{{PacketList|{{change|0x37|0x38}}|Destroy Entities|pre=unchanged}}
{{PacketList|{{Change|0x39|0x3B}}|Entity Metadata|pre=unchanged}}
+
{{PacketList|{{change|0x38|0x39}}|Remove Entity Effect|pre=unchanged}}
{{PacketList|{{Change|0x3A|0x3C}}|Attach Entity|pre=unchanged}}
+
{{PacketList|{{change|0x39|0x3A}}|Resource Pack Send|pre=unchanged}}
{{PacketList|{{Change|0x3B|0x3D}}|Entity Velocity|pre=unchanged}}
+
{{PacketList|{{change|0x3A|0x3B}}|Respawn}}
{{PacketList|{{Change|0x3C|0x3E}}|Entity Equipment|pre=unchanged}}
+
{{PacketList|{{change|0x3B|0x3C}}|Entity Head Look|pre=unchanged}}
{{PacketList|{{Change|0x3D|0x3F}}|Set Experience|pre=unchanged}}
+
{{PacketList|{{change|0x3C|0x3D}}|Select Advancement Tab|pre=unchanged}}
{{PacketList|{{Change|0x3E|0x40}}|Update Health|pre=unchanged}}
+
{{PacketList|{{change|0x3D|0x3E}}|World Border|pre=unchanged}}
{{PacketList|{{Change|0x3F|0x41}}|Scoreboard Objective|pre=unchanged}}
+
{{PacketList|{{change|0x3E|0x3F}}|Camera|pre=unchanged}}
{{PacketList|{{Change|0x40|0x42}}|Set Passengers|pre=unchanged}}
+
{{PacketList|{{change|0x3F|0x40}}|Held Item Change (clientbound)|pre=unchanged}}
{{PacketList|{{Change|0x41|0x43}}|Teams|pre=unchanged}}
+
{{PacketList|{{change|0x40|0x41}}|Update View Position|pre=unchanged}}
{{PacketList|{{Change|0x42|0x44}}|Update Score|pre=unchanged}}
+
{{PacketList|{{change|0x41|0x42}}|Update View Distance|pre=unchanged}}
{{PacketList|{{Change|0x43|0x45}}|Spawn Position|pre=unchanged}}
+
{{PacketList|{{change|0x42|0x43}}|Display Scoreboard|pre=unchanged}}
{{PacketList|{{Change|0x44|0x46}}|Time Update|pre=unchanged}}
+
{{PacketList|{{change|0x43|0x44}}|Entity Metadata|pre=unchanged}}
{{PacketList|{{Change|0x45|0x47}}|Title|pre=unchanged}}
+
{{PacketList|{{change|0x44|0x45}}|Attach Entity|pre=unchanged}}
{{PacketList|{{Change|0x46|0x48}}|Sound Effect|pre=unchanged}}
+
{{PacketList|{{change|0x45|0x46}}|Entity Velocity|pre=unchanged}}
{{PacketList|{{Change|0x47|0x49}}|Player List Header And Footer|pre=unchanged}}
+
{{PacketList|{{change|0x46|0x47}}|Entity Equipment|pre=unchanged}}
{{PacketList|{{Change|0x48|0x4A}}|Collect Item|pre=unchanged}}
+
{{PacketList|{{change|0x47|0x48}}|Set Experience|pre=unchanged}}
{{PacketList|{{Change|0x49|0x4B}}|Entity Teleport|pre=unchanged}}
+
{{PacketList|{{change|0x48|0x49}}|Update Health|pre=unchanged}}
{{PacketList|{{Change|0x4A|0x4C}}|Entity Properties|pre=unchanged}}
+
{{PacketList|{{change|0x49|0x4A}}|Scoreboard Objective|pre=unchanged}}
{{PacketList|{{Change|0x4B|0x4D}}|Entity Effect|pre=unchanged}}
+
{{PacketList|{{change|0x4A|0x4B}}|Set Passengers|pre=unchanged}}
{{PacketList|0x4E|Advancement Progress|rel=added}}
+
{{PacketList|{{change|0x4B|0x4C}}|Teams|pre=unchanged}}
|-
+
{{PacketList|{{change|0x4C|0x4D}}|Update Score|pre=unchanged}}
!colspan="4"| Play serverbound
+
{{PacketList|{{change|0x4D|0x4E}}|Spawn Position|pre=unchanged}}
{{PacketList|0x01|Prepare Crafting Grid|rel=added}}
+
{{PacketList|{{change|0x4E|0x4F}}|Time Update|pre=unchanged}}
{{PacketList|{{Change|0x01|0x02}}|Tab-Complete (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x4F|0x50}}|Title|pre=unchanged}}
{{PacketList|{{Change|0x02|0x03}}|Chat Message (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x50|0x51}}|Entity Sound Effect|pre=unchanged}}
{{PacketList|{{Change|0x03|0x04}}|Client Status|pre=unchanged}}
+
{{PacketList|{{change|0x51|0x52}}|Sound Effect|pre=unchanged}}
{{PacketList|{{Change|0x04|0x05}}|Client Settings|pre=unchanged}}
+
{{PacketList|{{change|0x52|0x53}}|Stop Sound|pre=unchanged}}
{{PacketList|{{Change|0x05|0x06}}|Confirm Transaction (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x53|0x54}}|Player List Header And Footer|pre=unchanged}}
{{PacketList|{{Change|0x06|0x07}}|Enchant Item|pre=unchanged}}
+
{{PacketList|{{change|0x54|0x55}}|NBT Query Response|pre=unchanged}}
{{PacketList|{{Change|0x07|0x08}}|Click Window|pre=unchanged}}
+
{{PacketList|{{change|0x55|0x56}}|Collect Item|pre=unchanged}}
{{PacketList|{{Change|0x08|0x09}}|Close Window (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x56|0x57}}|Entity Teleport|pre=unchanged}}
{{PacketList|{{Change|0x09|0x0A}}|Plugin Message (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x57|0x58}}|Advancements|pre=unchanged}}
{{PacketList|{{Change|0x0A|0x0B}}|Use Entity|pre=unchanged}}
+
{{PacketList|{{change|0x58|0x59}}|Entity Properties|pre=unchanged}}
{{PacketList|{{Change|0x0B|0x0C}}|Keep Alive (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x59|0x5A}}|Entity Effect|pre=unchanged}}
{{PacketList|{{Change|0x0C|0x0D}}|Player Position|pre=unchanged}}
+
{{PacketList|{{change|0x5A|0x5B}}|Declare Recipes|pre=unchanged}}
{{PacketList|{{Change|0x0D|0x0E}}|Player Position And Look (serverbound)|pre=unchanged}}
+
{{PacketList|{{change|0x5B|0x5C}}|Tags|pre=unchanged}}
{{PacketList|{{Change|0x0E|0x0F}}|Player Look|pre=unchanged}}
+
  |}
{{PacketList|{{Change|0x0F|0x10}}|Player|pre=unchanged}}
 
{{PacketList|{{Change|0x10|0x11}}|Vehicle Move (serverbound)|pre=unchanged}}
 
{{PacketList|{{Change|0x11|0x12}}|Steer Boat|pre=unchanged}}
 
{{PacketList|{{Change|0x12|0x13}}|Player Abilities (serverbound)|pre=unchanged}}
 
{{PacketList|{{Change|0x13|0x14}}|Player Digging|pre=unchanged}}
 
{{PacketList|{{Change|0x14|0x15}}|Entity Action|pre=unchanged}}
 
{{PacketList|{{Change|0x15|0x16}}|Steer Vehicle|pre=unchanged}}
 
{{PacketList|0x17|Crafting Book Data|rel=added}}
 
{{PacketList|{{Change|0x16|0x18}}|Resource Pack Status|pre=unchanged}}
 
{{PacketList|{{Change|0x17|0x19}}|Held Item Change (serverbound)|pre=unchanged}}
 
{{PacketList|{{Change|0x18|0x1A}}|Creative Inventory Action|pre=unchanged}}
 
{{PacketList|{{Change|0x19|0x1B}}|Update Sign|pre=unchanged}}
 
{{PacketList|{{Change|0x1A|0x1C}}|Animation (serverbound)|pre=unchanged}}
 
{{PacketList|{{Change|0x1B|0x1D}}|Spectate|pre=unchanged}}
 
{{PacketList|{{Change|0x1C|0x1E}}|Player Block Placement|pre=unchanged}}
 
{{PacketList|{{Change|0x1D|0x1F}}|Use Item|pre=unchanged}}
 
  {{PacketList|0x20|Advancement Tab|rel=added}}
 
|-
 
|}
 
  
 
== New/modified data types ==
 
== New/modified data types ==
  
=== Entity Metadata ===
+
No changes so far.
  
Note that entity metadata is a totally distinct concept from block metadata.  It is not required to send all metadata fields, or even any metadata fields, so long as the terminating entry is correctly sent.
+
== Entity Metadata ==
  
Entity Metadata is an array of entries, each of which looks like the following:
+
{{warning2|Lots of shifts, of course}}
 +
 
 +
=== Living ===
 +
 
 +
Extends [[#Entity|Entity]].
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Name
+
  ! Index
 
  ! Type
 
  ! Type
  ! Meaning
+
  !style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | Index
+
  |rowspan="5"| 7
  | Unsigned Byte
+
  |rowspan="5"| Byte
  | Unique index key determining the meaning of the following value, see the table below. If this is <code>0xff</code> then the it is the end of the Entity Metadata array and no more is read.
+
  |colspan="2"| Hand states, used to trigger blocking/eating/drinking animation.
 +
|rowspan="5"| 0
 
  |-
 
  |-
  | Type
+
  ! Bit mask
  | Optional Byte Enum
+
  ! Meaning
| Only if Index is not <code>0xff</code>; the type of the index, see the table below
 
 
  |-
 
  |-
  | Value
+
  | 0x01
  | Optional ''value of Type''
+
  | Is hand active
| Only if Index is not <code>0xff</code>: the value of the metadata field
 
|}
 
 
 
{| class="wikitable"
 
! Value of Type field
 
! [[Data types|Type]] of Value field
 
! Notes
 
 
  |-
 
  |-
  | 0
+
  | 0x02
| Byte
+
  | Active hand (0 = main hand, 1 = offhand)
  |  
 
 
  |-
 
  |-
  | 1
+
  | 0x04
| VarInt
+
  | In riptide spin attack
  |  
 
 
  |-
 
  |-
  | 2
+
  | 8
 
  | Float
 
  | Float
  |  
+
  |colspan="2"| Health
 +
| 1.0
 
  |-
 
  |-
  | 3
+
  | 9
  | String
+
  | VarInt
  |  
+
  |colspan="2"| Potion effect color (or 0 if there is no effect)
 +
| 0
 
  |-
 
  |-
  | 4
+
  | 10
  | [[Chat]]
+
  | Boolean
  |  
+
  |colspan="2"| Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount
 +
| false
 
  |-
 
  |-
  | 5
+
  | 11
  | [[Slot]]
+
  | VarInt
  |  
+
  |colspan="2"| Number of arrows in entity
 +
| 0
 +
|- {{Added}}
 +
| 12
 +
| VarInt
 +
|colspan="2"| Health added by absorption (based on the AbsorptionAmount tag)
 +
| 0
 
  |-
 
  |-
  | 6
+
  | {{change|12|13}}
  | Boolean
+
  | OptBlockPos
  |  
+
|colspan="2"| Sleeping location (from SleepingX, SleepingY, SleepingZ tags)
 +
| Absent
 +
|}
 +
 
 +
=== Bee ===
 +
 
 +
Extends [[#Insentient|Insentient]].
 +
 
 +
{| class="wikitable" {{added}}
 +
  ! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  | 7
+
  |rowspan="5"| 16
  | Rotation
+
  |rowspan="5"| Byte
  | 3 floats: rotation on x, rotation on y, rotation on z
+
  |colspan="2"| Flags
 +
|rowspan="5"| 0
 
  |-
 
  |-
  | 8
+
  | 0x01 || ''Unused''
| [[Data Types#Position|Position]]
 
|  
 
 
  |-
 
  |-
  | 9
+
  | 0x02 || Is angry
| OptPosition (Boolean + Optional Position)
 
| Position is present if the Boolean is set to true
 
 
  |-
 
  |-
  | 10
+
  | 0x04 || Has stung
| Direction (VarInt)
 
| (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5)
 
 
  |-
 
  |-
  | 11
+
  | 0x08 || Has nectar
| OptUUID (Boolean + Optional UUID)
 
| UUID is present if the Boolean is set to true
 
 
  |-
 
  |-
  | 12
+
  | 17
  | OptBlockID (VarInt)
+
  | VarInt
  | 0 for absent otherwise, <code><nowiki>id &lt;&lt; 4 | data</nowiki></code>
+
  |colspan="2"| Anger
|-style="background-color: #d9ead3;"
+
  | 0
| 13
 
| [[NBT|NBT Tag]]
 
  |
 
 
  |}
 
  |}
  
Entity classes also recursively inherit fields from classes they extend.
+
=== Wolf ===
 
 
=== IllusionIllager ===
 
 
 
Extends [[#EvocationIllager|EvocationIllager]].
 
 
 
* ''Entity ID: '''37'''.''
 
 
 
=== Parrot ===
 
  
 
Extends [[#TameableAnimal|TameableAnimal]].
 
Extends [[#TameableAnimal|TameableAnimal]].
  
{| class="wikitable" style="background-color: #d9ead3;"
+
{| class="wikitable"
 
  ! Index
 
  ! Index
 
  ! Type
 
  ! Type
 
  !style="width: 250px;" colspan="2"| Meaning
 
  !style="width: 250px;" colspan="2"| Meaning
 
  ! Default
 
  ! Default
 +
|- {{removed}}
 +
| {{change|17|18}}
 +
| Float
 +
|colspan="2"| Damage taken (used for tail rotation)
 +
| Value of health field (1.0)
 +
|-
 +
| 18
 +
| Boolean
 +
|colspan="2"| Is begging
 +
| false
 
  |-
 
  |-
  | 15
+
  | 19
 
  | VarInt
 
  | VarInt
  |colspan="2"| Variant (0: red/blue, 1: blue, 2: green, 3: yellow/blue, 4: silver)
+
  |colspan="2"| Collar color (values are those {{Minecraft Wiki|Data_values#Dyes|used with dyes}})
  | 0
+
  | 14 (Red)
 
  |}
 
  |}
  
* ''Entity ID: '''105'''.''
+
=== Enderman ===
  
=== Player ===
+
Extends [[#Monster|Monster]].
 
 
Extends [[#Living|Living]].
 
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 254: Line 242:
 
  ! Default
 
  ! Default
 
  |-
 
  |-
  | 11
+
  | 15
  | Float
+
  | Opt BlockID
  |colspan="2"| Additional Hearts
+
  |colspan="2"| Carried block
  | 0.0
+
  | Absent
 
  |-
 
  |-
| 12
 
| VarInt
 
|colspan="2"| Score
 
| 0
 
|-
 
|rowspan="10"| 13
 
|rowspan="10"| Byte
 
|colspan="2"| The Displayed Skin Parts bit mask that is sent in [[Protocol#Client Settings|Client Settings]]
 
|rowspan="10"| 0
 
|-
 
! Bit mask !! Meaning
 
|-
 
| 0x01 || Cape enabled
 
|-
 
| 0x02 || Jacket enabled
 
|-
 
| 0x04 || Left sleeve enabled
 
|-
 
| 0x08 || Right sleeve enabled
 
|-
 
| 0x10 || Left pants leg enabled
 
|-
 
| 0x20 || Right pants leg enabled
 
|-
 
| 0x40 || Hat enabled
 
|-
 
| 0x80 || ''Unused''
 
|-
 
| 14
 
| Byte
 
|colspan="2"| Main hand (0 : Left, 1 : Right)
 
| 1
 
|- style="background-color: #d9ead3;"
 
| 15
 
| NBT Tag
 
|colspan="2"|Left shoulder entity data
 
|
 
|- style="background-color: #d9ead3;"
 
 
  | 16
 
  | 16
  | NBT Tag
+
  | Boolean
  |colspan="2"|Right shoulder entity data
+
  |colspan="2"| Is screaming
  |  
+
  | false
 +
|- {{added}}
 +
| 17
 +
| Boolean
 +
|colspan="2"| Is stared at
 +
| false
 
  |}
 
  |}
  
== Block Actions ==
+
=== Trident ===
 
 
== Note Block ==
 
 
 
Displays a colored note particle and plays the appropriate note sound effect.
 
 
 
=== Action IDs ===
 
  
The action ID is used to determine the instrument to play.
+
Extends [[#Arrow|Arrow]].
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Index
 +
! Type
 +
!style="width: 250px;" colspan="2"| Meaning
 +
! Default
 
  |-
 
  |-
  ! Type ID
+
  | 10
  ! Instrument
+
  | VarInt
! Material/block
+
  |colspan="2"| Loyalty level (enchantment)
! Sound
 
  |-
 
 
  | 0
 
  | 0
| Harp
+
  |- {{Added}}
| Any other material
+
  | 11
| <code>block.note.harp</code>
+
  | Boolean
|-
+
  |colspan="2"| Has enchantment glint
| 1
+
  | False
| Bass Drum
 
| Stone
 
| <code>block.note.harp</code>
 
|-
 
| 2
 
| Snare Drum
 
| Sand
 
| <code>block.note.snare</code>
 
|-
 
| 3
 
| Clicks/Sticks
 
| Glass
 
| <code>block.note.hat</code>
 
  |-
 
  | 4
 
  | Bass guitar
 
  | Wood
 
| <code>block.note.bass</code>
 
|- style="background-color: #d9ead3;"
 
| 5
 
| Flute
 
| Clay
 
| <code>block.note.flute</code>
 
|- style="background-color: #d9ead3;"
 
| 6
 
| Bell
 
| Gold block
 
| <code>block.note.bell</code>
 
|- style="background-color: #d9ead3;"
 
| 7
 
| Guitar
 
| Wool
 
| <code>block.note.guitar</code>
 
|- style="background-color: #d9ead3;"
 
| 8
 
| Chime
 
| Packed ice
 
| <code>block.note.chime</code>
 
|- style="background-color: #d9ead3;"
 
| 9
 
| Xylophone
 
| Bone block
 
  | <code>block.note.xylophone</code>
 
 
  |}
 
  |}
  
Any unknown ID is treated as if it were <code>0</code>.
+
== Block Actions ==
  
The sound event <code>block.note.pling</code> is unassigned and unused.
+
No changes so far.
  
=== Action param ===
+
== Inventories ==
  
The pitch of the note (between 0–24 inclusive where 0 is the lowest and 24 is the highest). More information about how the pitch values correspond to notes in real life and how they correspond to pitch scaling on the sound effects can be found in the {{Minecraft Wiki|Note Block}} article on the Minecraft wiki.
+
No changes so far.
 
 
== Chat components ==
 
 
 
==== Translation component ====
 
 
 
{{Need Info|Is using this with an invalid key intended or deprecated?  Also, what exactly happens on invalid formats?}}
 
 
 
Translates text into the current language.  If the JSON contains a <code>translate</code> key, then the component is a translation component.
 
 
 
Translation supports <code>%s</code> and <code>%%</code> format tokens.  <code>%%</code> is just an escaped percent symbol.  <code>%s</code> marks text to replace using content from the optional <code>with</code> tag.  <code>with</code> is an array of components.
 
 
 
{{Change||As a special case, if the translation key is <code>chat.type.text</code>, it will be changed to <code>chat.type.text.narrate</code> when passed to narrator (although it will remain as <code>chat.type.text</code> in chat).}}
 
 
 
==== Keybind component ====
 
 
 
{{change||Displays the client's current keybind for the specified key.  If the component contains a <code>keybind</code> key, then it is a keybind component.  The value is named after the keys in {{Minecraft Wiki|options.txt}} (for instance, for <code>key_key.forward</code> in options.txt, <code>key.forward</code> would be used in the component and <kbd>W</kbd> would be displayed).  For keys that are not known, the value provided should be displayed instead (for instance <code>key.invalid</code> would remain as <code>key.invalid</code>).}}
 
  
 
== Plugin Channels ==
 
== Plugin Channels ==
Line 402: Line 294:
  
 
=== Clientbound ===
 
=== Clientbound ===
 +
==== Spawn Mob ====
  
==== Advancements ====
+
Sent by the server when a mob entity is spawned.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 409: Line 302:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="9"| 0x08
+
  |rowspan="13"| 0x03
  |rowspan="9"| Play
+
  |rowspan="13"| Play
  |rowspan="9"| Client
+
  |rowspan="13"| Client
  |colspan="2"| Reset/Clear
+
  | Entity ID
  |colspan="2"| Boolean
+
  | VarInt
  | Whether to reset/clear the current advancements
+
  |  
 
  |-
 
  |-
  |colspan="2"| Mapping size
+
  | Entity UUID
  |colspan="2"| VarInt
+
  | UUID
  | Size of the following array
+
  |  
 
  |-
 
  |-
  |rowspan="2"| Advancement mapping
+
  | Type
| Key
+
  | VarInt
|rowspan="2"| Array
+
  | The type of mob. See [[Entities#Mobs]]
  | Identifier
 
  | The identifier of the advancement
 
 
  |-
 
  |-
  | Value
+
  | X
  | Advancement
+
  | Double
  | See below
+
  |  
 
  |-
 
  |-
  |colspan="2"| List size
+
  | Y
  |colspan="2"| VarInt
+
  | Double
  | Size of the following array
+
  |  
 
  |-
 
  |-
  |colspan="2"| Identifiers
+
  | Z
  |colspan="2"| Array of Identifier
+
  | Double
  | The identifiers of the advancements that should be removed
+
  |  
 
  |-
 
  |-
  |colspan="2"| Progress size
+
  | Yaw
  |colspan="2"| VarInt
+
  | Angle
  | Size of the following array
+
  |  
 
  |-
 
  |-
  |rowspan="2"| Progress mapping
+
  | Pitch
| Key
+
  | Angle
|rowspan="2"| Array
+
  |  
  | Identifier
 
  | The identifier of the advancement
 
 
  |-
 
  |-
  | Value
+
  | Head Pitch
  | Advancement progress
+
  | Angle
  | See below
+
  |  
|}
 
 
 
Advancement structure:
 
 
 
{| class="wikitable"
 
!colspan="2"| Field Name
 
!colspan="2"| Field Type
 
! Notes
 
 
  |-
 
  |-
  |colspan="2"| Has parent
+
  | Velocity X
  |colspan="2"| Boolean
+
  | Short
  | Indicates whether the next field exists.
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
  |colspan="2"| Parent id
+
  | Velocity Y
  |colspan="2"| Optional Identifier
+
  | Short
  | The identifier of the parent advancement.
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
 
  |-
 
  |-
  |colspan="2"| Has display
+
  | Velocity Z
  |colspan="2"| Boolean
+
  | Short
| Indicates whether the next field exists
+
  | Same units as [[#Entity Velocity|Entity Velocity]]
|-
+
  |- {{removed}}
|colspan="2"| Display data
+
  | Metadata
  |colspan="2"| Optional advancement display
+
  | [[Entities#Entity Metadata Format|Entity Metadata]]
| See below.
+
  |  
  |-
 
  |colspan="2"| Number of criteria
 
  |colspan="2"| VarInt
 
| Size of the following array
 
|-
 
|rowspan="2"| Criteria
 
| Key
 
|rowspan="2"| Array
 
| Identifier
 
| The identifier of the criterion
 
|-
 
| Value
 
| '''Void'''
 
| There is ''no'' content written here.  Perhaps this will be expanded in the future?
 
|-
 
|colspan="2"| Array length
 
|colspan="2"| VarInt
 
| Number of arrays in the following array
 
|-
 
|rowspan="2"| Requirements
 
| Array length 2
 
|rowspan="2"| Array
 
| VarInt
 
| Number of elements in the following array
 
|-
 
| Requirement
 
| Array of String
 
  | Array of required criteria
 
 
  |}
 
  |}
  
Advancement display:
+
==== Spawn Player ====
 +
 
 +
This packet is sent by the server when a player comes into visible range, ''not'' when a player joins.
 +
 
 +
This packet must be sent after the [[#Player Info|Player Info]] packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.
 +
 
 +
Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.
  
 
{| class="wikitable"
 
{| class="wikitable"
 +
! Packet ID
 +
! State
 +
! Bound To
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  | Title
+
  |rowspan="8"| 0x05
  | Chat
+
|rowspan="8"| Play
  |
+
|rowspan="8"| Client
 +
| Entity ID
 +
  | VarInt
 +
  | Player's EID
 
  |-
 
  |-
  | Description
+
  | Player UUID
  | Chat
+
  | UUID
  |
+
  | See below for notes on {{Minecraft Wiki|Server.properties#online-mode|offline mode}} and NPCs
 
  |-
 
  |-
  | Icon
+
  | X
  | [[Slot]]
+
  | Double
  |
+
  |  
 
  |-
 
  |-
  | Frame type
+
  | Y
  | VarInt enum
+
  | Double
  | 0 = <code>task</code>, 1 = <code>challenge</code>, 2 = <code>goal</code>
+
  |  
 
  |-
 
  |-
  | Flags
+
  | Z
  | Integer
+
  | Double
  | 0x1: has background texture; 0x2: <code>show_toast</code>; 0x4: <code>hidden</code>
+
  |  
 
  |-
 
  |-
  | Background texture
+
  | Yaw
  | Optional Identifier
+
  | Angle
  | Background texture location.  Only if flags indicates it.
+
  |  
 
  |-
 
  |-
  | X coord
+
  | Pitch
  | Float
+
  | Angle
 
  |  
 
  |  
  |-
+
  |- {{removed}}
  | Y coord
+
  | Metadata
  | Float
+
  | [[Entities#Entity Metadata Format|Entity Metadata]]
 
  |  
 
  |  
 
  |}
 
  |}
  
Advancement progress:
+
When in {{Minecraft Wiki|Server.properties#online-mode|online mode}}, the UUIDs must be valid and have valid skin blobs.
  
{| class="wikitable"
+
In offline mode, [[Wikipedia:Universally unique identifier#Versions 3 and 5 (namespace name-based)|UUID v3]] is used with the String <code>OfflinePlayer:&lt;player name&gt;</code>, encoded in UTF-8 (and case-sensitive).
!colspan="2"| Field Name
+
 
!colspan="2"| Field Type
+
For NPCs UUID v2 should be used. Note:
! Notes
 
|-
 
|colspan="2"| Size
 
|colspan="2"| VarInt
 
| Size of the following array
 
|-
 
|rowspan="2"| Criteria
 
| Criterion identifier
 
|rowspan="2"| Array
 
| Identifier
 
| The identifier of the criterion.
 
|-
 
| Criterion progress
 
| Criterion progress
 
|
 
|}
 
  
Criterion progress:
+
<+Grum> i will never confirm this as a feature you know that :)
  
{| class="wikitable"
+
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>.
! Field Name
 
! Field Type
 
! Notes
 
|-
 
| Achieved
 
| Boolean
 
| If true, next field is present
 
|-
 
| Date of achieving
 
| Optional Long
 
| As returned by [https://docs.oracle.com/javase/6/docs/api/java/util/Date.html#getTime() <code>Date.getTime</code>]
 
|}
 
  
 
==== Update Block Entity ====
 
==== Update Block Entity ====
  
Sets tile entity associated with the block at the given location.
+
Sets the block entity associated with the block at the given location.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 599: Line 436:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="3"| {{Change|0x09|0x0A}}
+
  |rowspan="3"| {{change|0x09|0x0A}}
 
  |rowspan="3"| Play
 
  |rowspan="3"| Play
 
  |rowspan="3"| Client
 
  |rowspan="3"| Client
Line 621: Line 458:
 
* '''3''': Set the level, primary, and secondary powers of a beacon
 
* '''3''': Set the level, primary, and secondary powers of a beacon
 
* '''4''': Set rotation and skin of mob head
 
* '''4''': Set rotation and skin of mob head
* '''5''': Set type of flower in flower pot
+
* '''5''': Declare a conduit
 
* '''6''': Set base color and patterns on a banner
 
* '''6''': Set base color and patterns on a banner
 
* '''7''': Set the data for a Structure tile entity
 
* '''7''': Set the data for a Structure tile entity
 
* '''8''': Set the destination for a end gateway
 
* '''8''': Set the destination for a end gateway
 
* '''9''': Set the text on a sign
 
* '''9''': Set the text on a sign
* '''10''': Declare a shulker box (unclear if there is any actual data)
+
* '''10''': Unused
* {{Change||'''11''': Set the color of a bed}}
+
* '''11''': Declare a bed
 +
* '''12''': Set data of a jigsaw block
 +
* '''13''': Set items in a campfire
 +
* {{change||'''14''': Beehive information}}
  
==== Unlock Recipes ====
+
==== 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 dimenison the player is currently located. You can also infer this information from the primary bitmask and the amount of uncompressed bytes sent.  This packet also sends all block entities in the chunk (though sending them is not required; it is still legal to send them with [[#Update Block Entity|Update Block Entity]] later).
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 635: Line 481:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="8"| 0x31
+
  |rowspan="10"| {{change|0x21|0x22}}
  |rowspan="8"| Play
+
  |rowspan="10"| Play
  |rowspan="8"| Client
+
  |rowspan="10"| 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)
 
  |-
 
  |-
  |colspan="2"| Action
+
  | Full chunk
  |colspan="2"| Short
+
  | Boolean
  | The action, see below
+
  | See [[Chunk Format#Full chunk|Chunk Format]]
 
  |-
 
  |-
  |colspan="2"| Crafting Book Open
+
  | Primary Bit Mask
  |colspan="2"| Boolean
+
  | VarInt
  | If true, then the crafting book will be open when the player opens its inventory.
+
  | 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).
 
  |-
 
  |-
  |colspan="2"| Filtering Craftable
+
  | Heightmaps
  |colspan="2"| Boolean
+
| [[NBT]]
  | If true, then the filtering option is active when the players opens its inventory.
+
| Compound containing one long array named <code>MOTION_BLOCKING</code>, which is a heightmap for the highest solid block at each position in the chunk (as a compacted long array with 256 entries at 9 bits per entry totaling 36 longs). The Notchian server also adds a <code>WORLD_SURFACE</code> long array, the purpose of which is unknown, but it's not required for the chunk to be accepted.
 +
|- {{Added}}
 +
  | Biomes
 +
| Optional array of Integer
 +
  | 1024 biome IDs, ordered by x then z then d, in 4&times;4&times;4 blocks.  Not present if full chunk is false.
 
  |-
 
  |-
  |colspan="2"| Array size 1
+
  | Size
  |colspan="2"| VarInt
+
  | VarInt
  | Number of elements in the following array
+
  | Size of Data in bytes
 
  |-
 
  |-
  |rowspan="1"| Recipe ID
+
  | Data
  |
+
  | Byte array
  |rowspan="1"| Array
+
  | See [[Chunk Format#Data structure|data structure]] in Chunk Format
| Integer
 
|
 
 
  |-
 
  |-
  |colspan="2"| Array size 2
+
  | Number of block entities
  |colspan="2"| VarInt
+
  | VarInt
 
  | Number of elements in the following array
 
  | Number of elements in the following array
 
  |-
 
  |-
  |rowspan="1"| Recipe ID
+
  | Block entities
  |
+
  | Array of [[NBT|NBT Tag]]
|rowspan="1"| Array
+
  | All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.
  | Integer
 
  |
 
 
  |}
 
  |}
Action:
 
* 1 = All the recipes in the list 1 are added and their icon will be shown in the notification. The notification will only show up if all the recipes in this list weren't displayed before (removing the recipe resets this). All the recipes in the list 2 will added to the recipe book.
 
* 2 = Remove all the recipes in the list 1. This allows them to re-displayed when they are readded.
 
* 3 = All the recipes in the list 2 will added to the recipe book. All the recipes in list 1 will be tagged as displayed. No notification will be shown.
 
  
Recipe ID:
+
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.
These are hardcoded values in the client and server, all the recipe json files will be loaded in a specific order (alphabetical, like sounds) and internal ids will be assigned in that order. There are also inbuilt recipes like fireworks, banners, etc., these are the first recipes to have their id assigned. Due the fact that the recipes are loaded in a specific order will the ids very likely change when recipes get added. Custom recipes are scheduled for Minecraft 1.13, so most likely will things change a bit in that version.
+
 
 +
{{Change||To get the biome at a coordinate, use <code>biomes[((y >> 2) & 63) << 4 {{!}} ((z >> 2) & 3) << 2 {{!}} ((x >> 2) & 3)]</code>}}
  
==== Advancement Progress ====
+
===== Data structure =====
 +
 
 +
The data section of the packet contains most of the useful data for the chunk.
  
 
{| class="wikitable"
 
{| class="wikitable"
  ! Packet ID
+
  |-
! State
 
! Bound To
 
 
  ! Field Name
 
  ! Field Name
 
  ! Field Type
 
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x4E
+
  | Data
|rowspan="2"| Play
+
  | Array of [[Chunk Format#Chunk Section structure|Chunk Section]]
  |rowspan="2"| Client
+
  | The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
| Has id
+
  |- {{removed}}
  | Boolean
+
  | Biomes
| Indicates if the next field is present
+
  | Optional Int Array
  |-
+
  | Only sent if full chunk is true; 256 entries if present
  | ID
 
  | Optional Identifier
 
  |
 
 
  |}
 
  |}
 
=== Serverbound ===
 
  
==== Prepare Crafting Grid ====
+
==== Particle ====
 +
 
 +
Displays the named particle.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 713: Line 560:
 
  ! State
 
  ! State
 
  ! Bound To
 
  ! Bound To
  !colspan="2"| Field Name
+
  ! Field Name
  !colspan="2"| Field Type
+
  ! Field Type
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="12"| 0x01
+
  |rowspan="11"| {{Change|0x23|0x24}}
  |rowspan="12"| Play
+
  |rowspan="11"| Play
  |rowspan="12"| Server
+
  |rowspan="11"| Client
  |colspan="2"| Window ID
+
| Particle ID
  |colspan="2"| Byte
+
  | Int
  | The window id.
+
| The particle ID listed in [[#Particle|the particle data type]].
 +
|-
 +
  | Long Distance
 +
| Boolean
 +
  | If true, particle distance increases from 256 to 65536
 
  |-
 
  |-
  |colspan="2"| Action number
+
  | X
  |colspan="2"| Short
+
  | {{Change|Float|Double}}
  | The transaction number. Will be send to the client in a Confirm Transaction packet.
+
  | X position of the particle
 
  |-
 
  |-
  |colspan="2"| Array size
+
  | Y
  |colspan="2"| Short
+
  | {{Change|Float|Double}}
  | Number of elements in the following array
+
  | Y position of the particle
 
  |-
 
  |-
  |rowspan="3"| Return Entry
+
  | Z
| Item
+
  | {{Change|Float|Double}}
  |rowspan="3"| Array
+
  | Z position of the particle
| Slot
 
  | The item stack that will be put in the inventory slot
 
 
  |-
 
  |-
  | Crafting Slot
+
  | Offset X
  | Byte
+
  | Float
  | The crafting slot index in the active container
+
  | This is added to the X position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  | Player Slot
+
  | Offset Y
  | Byte
+
  | Float
  | The player slot index in the player inventory
+
  | This is added to the Y position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  |colspan="2"| Array Size
+
  | Offset Z
  |colspan="2"| Short
+
  | Float
  | Number of elements in the following array
+
  | This is added to the Z position after being multiplied by random.nextGaussian()
 
  |-
 
  |-
  |rowspan="3"| Prepare Entry
+
  | Particle Data
| Item
+
  | Float
|rowspan="3"| Array
+
  | The data of each particle
  | Slot
 
  | The item stack that will be put in the crafting slot
 
 
  |-
 
  |-
  | Crafting Slot
+
  | Particle Count
  | Byte
+
  | Int
  | The crafting slot index in the active container
+
  | The number of particles to create
 
  |-
 
  |-
  | Player Slot
+
  | Data
  | Byte
+
  | Varies
  | The player slot index in the player inventory
+
  | The variable data listed in [[#Particle|the particle data type]].
 
  |}
 
  |}
  
This packet is send when a player clicks a recipe in the crafting book that is craftable (white border).
+
==== Join Game ====
 
 
1. Return Entries:
 
* All the items on the crafting slot are set to null/empty.
 
* Every entry item stack will be added to the player inventory, to the specific player slot.
 
 
 
2. Prepare Entries:
 
* All the items on the player inventory slots their quantity is decreased by 1.
 
* Every entry item stack will be put in the proper crafting grid slot.
 
 
 
The server will send a Confirm Transaction packet back to the client with the provided transaction id.
 
 
 
==== Client Status ====
 
  
Sent when the client is ready to complete login and when the client is ready to respawn after death.
+
See [[Protocol Encryption]] for information on logging in.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 789: Line 624:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="1"| 0x04
+
  |rowspan="9"| {{change|0x25|0x26}}
  |rowspan="1"| Play
+
  |rowspan="9"| Play
  |rowspan="1"| Server
+
  |rowspan="9"| Client
  | Action ID
+
  | Entity ID
  | VarInt Enum
+
  | Int
  | See below
+
  | The player's Entity ID (EID)
|}
 
 
 
''Action ID'' values:
 
 
 
{| class="wikitable"
 
 
  |-
 
  |-
  ! Action ID
+
  | Gamemode
  ! Action
+
  | Unsigned Byte
 +
| 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
 
  |-
 
  |-
  | 0
+
  | Dimension
  | Perform respawn
+
| Int Enum
 +
| -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
 +
|- {{Added}}
 +
| Hashed seed
 +
| Long
 +
  | First 8 bytes of the SHA-256 hash of the world's seed.
 
  |-
 
  |-
  | 1
+
  | Max Players
  | Request stats
+
  | Unsigned Byte
  |-
+
  | Was once used by the client to draw the player list, but now is ignored
| {{Change|2|}}
 
| {{Change|Open inventory|}}
 
|}
 
 
 
==== Crafting Book Data ====
 
 
 
{| class="wikitable"
 
! Packet ID
 
! State
 
! Bound To
 
!colspan="2"| Field Name
 
! Field Type
 
! Notes
 
 
  |-
 
  |-
  |rowspan="5"| 0x17
+
  | Level Type
|rowspan="5"| Play
+
  | String Enum (16)
|rowspan="5"| Server
+
  | default, flat, largeBiomes, amplified, customized, buffet, default_1_1
|colspan="2"| Type
 
  | Int
 
  | Determines the format of the rest of the packet
 
 
  |-
 
  |-
! Type
+
  | View Distance
! Field Name
+
  | VarInt
!
+
  | Render distance (2-32)
!
 
  |-
 
  | 1: Displayed Recipe
 
  | Recipe ID
 
| Int
 
| The internal id of the displayed recipe.
 
 
  |-
 
  |-
  |rowspan="2"| 2: Crafting Book Status
+
  | Reduced Debug Info
| Crafting Book Open
 
 
  | Boolean
 
  | Boolean
  | Whether the player has the crafting book currently openened/active.
+
  | If true, a Notchian client shows reduced information on the {{Minecraft Wiki|debug screen}}.  For servers in development, this should almost always be false.
  |-
+
  |- {{Added}}
  | Crafting Filter
+
  | Enable respawn screen
 
  | Boolean
 
  | Boolean
  | Whether the player has the crafting filter option currently active.
+
  | Set to false when the doImmediateRespawn gamerule is true
 
  |}
 
  |}
  
The Crafting Book Status type is send when the player closes its inventory.
+
==== Respawn ====
  
==== Advancement Tab ====
+
To change the player's dimension (overworld/nether/end), send them a respawn packet with the appropriate dimension, followed by prechunks/chunks for the new dimension, and finally a position and look packet. You do not need to unload chunks, the client will do it automatically.
  
 
{| class="wikitable"
 
{| class="wikitable"
Line 863: Line 676:
 
  ! Notes
 
  ! Notes
 
  |-
 
  |-
  |rowspan="2"| 0x20
+
  |rowspan="4"| {{change|0x3A|0x3B}}
  |rowspan="2"| Play
+
  |rowspan="4"| Play
  |rowspan="2"| Server
+
  |rowspan="4"| Client
  | Action
+
| Dimension
  | VarInt enum
+
| Int Enum
  | 0: Opened tab, 1: Closed screen
+
| -1: The Nether, 0: The Overworld, 1: The End
 +
|- {{Added}}
 +
  | Hashed seed
 +
  | Long
 +
| First 8 bytes of the SHA-256 hash of the world's seed.
 +
|-
 +
| Gamemode
 +
| Unsigned Byte
 +
  | 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
 
  |-
 
  |-
  | Tab ID
+
  | Level Type
  | Optional identifier
+
  | String (16)
  | Only present if action is Opened tab
+
  | Same as [[#Join Game|Join Game]]
 
  |}
 
  |}
 +
 +
{{Warning2|Avoid changing player's dimension to same dimension they were already in unless they are dead. If you change the dimension to one they are already in, weird bugs can occur, such as the player being unable to attack other players in new world (until they die and respawn).
 +
 +
If you must respawn a player in the same dimension without killing them, send two respawn packets, one to a different world and then another to the world you want. You do not need to complete the first respawn; it only matters that you send two packets.}}
 +
 +
=== Serverbound ===
 +
 +
No changes so far.
  
 
== Handshaking ==
 
== Handshaking ==
Line 879: Line 708:
 
=== Clientbound ===
 
=== Clientbound ===
  
No changes so far.
+
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 ===
 
=== Serverbound ===
 
No changes so far.
 
  
 
==== Handshake ====
 
==== Handshake ====
Line 902: Line 729:
 
  | Protocol Version
 
  | Protocol Version
 
  | VarInt
 
  | VarInt
  | See [[protocol version numbers]] (currently {{change|316|331}})
+
  | See [[protocol version numbers]] (currently {{change|498|571}})
 
  |-
 
  |-
 
  | Server Address
 
  | Server Address
 
  | String
 
  | 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.
+
  | Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
 
  |-  
 
  |-  
 
  | Server Port
 
  | Server Port
Line 936: Line 763:
  
 
No changes so far.
 
No changes so far.
 +
  
 
[[Category:Minecraft Modern]]
 
[[Category:Minecraft Modern]]

Latest revision as of 21:10, 8 December 2019

This page documents the changes from the last stable Minecraft release (currently 1.14.4, protocol 498) to the current pre-release (currently 1.15-pre6, protocol 571). 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
Handshaking serverbound
0x00 Handshake Current Pre
Play clientbound
0x03 Spawn Mob Current Pre
0x05 Spawn Player Current Pre
0x5C 0x08 Acknowledge Player Digging Current (unchanged)
0x08 0x09 Block Break Animation Current (unchanged)
0x09 0x0A Update Block Entity Current Pre
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)
0x0F 0x10 Multi Block Change Current (unchanged)
0x10 0x11 Tab-Complete (clientbound) Current (unchanged)
0x11 0x12 Declare Commands Current (unchanged)
0x12 0x13 Confirm Transaction (clientbound) Current (unchanged)
0x13 0x14 Close Window (clientbound) Current (unchanged)
0x14 0x15 Window Items Current (unchanged)
0x15 0x16 Window Property Current (unchanged)
0x16 0x17 Set Slot Current (unchanged)
0x17 0x18 Set Cooldown Current (unchanged)
0x18 0x19 Plugin Message (clientbound) Current (unchanged)
0x19 0x1A Named Sound Effect Current (unchanged)
0x1A 0x1B Disconnect (play) Current (unchanged)
0x1B 0x1C Entity Status Current (unchanged)
0x1C 0x1D Explosion Current (unchanged)
0x1D 0x1E Unload Chunk Current (unchanged)
0x1E 0x1F Change Game State Current (unchanged)
0x1F 0x20 Open Horse Window Current (unchanged)
0x20 0x21 Keep Alive (clientbound) Current (unchanged)
0x21 0x22 Chunk Data Current Pre
0x22 0x23 Effect Current (unchanged)
0x23 0x24 Particle Current Pre
0x24 0x25 Update Light Current (unchanged)
0x25 0x26 Join Game Current Pre
0x26 0x27 Map Data Current (unchanged)
0x27 0x28 Trade List Current (unchanged)
0x28 0x29 Entity Relative Move Current (unchanged)
0x29 0x2A Entity Look And Relative Move Current (unchanged)
0x2A 0x2B Entity Look Current (unchanged)
0x2B 0x2C Entity Current (unchanged)
0x2C 0x2D Vehicle Move (clientbound) Current (unchanged)
0x2D 0x2E Open Book Current (unchanged)
0x2E 0x2F Open Window Current (unchanged)
0x2F 0x30 Open Sign Editor Current (unchanged)
0x30 0x31 Craft Recipe Response Current (unchanged)
0x31 0x32 Player Abilities (clientbound) Current (unchanged)
0x32 0x33 Combat Event Current (unchanged)
0x33 0x34 Player Info Current (unchanged)
0x34 0x35 Face Player Current (unchanged)
0x35 0x36 Player Position And Look (clientbound) Current (unchanged)
0x36 0x37 Unlock Recipes Current (unchanged)
0x37 0x38 Destroy Entities Current (unchanged)
0x38 0x39 Remove Entity Effect Current (unchanged)
0x39 0x3A Resource Pack Send Current (unchanged)
0x3A 0x3B Respawn Current Pre
0x3B 0x3C Entity Head Look Current (unchanged)
0x3C 0x3D Select Advancement Tab Current (unchanged)
0x3D 0x3E World Border Current (unchanged)
0x3E 0x3F Camera Current (unchanged)
0x3F 0x40 Held Item Change (clientbound) Current (unchanged)
0x40 0x41 Update View Position Current (unchanged)
0x41 0x42 Update View Distance Current (unchanged)
0x42 0x43 Display Scoreboard Current (unchanged)
0x43 0x44 Entity Metadata Current (unchanged)
0x44 0x45 Attach Entity Current (unchanged)
0x45 0x46 Entity Velocity Current (unchanged)
0x46 0x47 Entity Equipment Current (unchanged)
0x47 0x48 Set Experience Current (unchanged)
0x48 0x49 Update Health Current (unchanged)
0x49 0x4A Scoreboard Objective Current (unchanged)
0x4A 0x4B Set Passengers Current (unchanged)
0x4B 0x4C Teams Current (unchanged)
0x4C 0x4D Update Score Current (unchanged)
0x4D 0x4E Spawn Position Current (unchanged)
0x4E 0x4F Time Update Current (unchanged)
0x4F 0x50 Title Current (unchanged)
0x50 0x51 Entity Sound Effect Current (unchanged)
0x51 0x52 Sound Effect Current (unchanged)
0x52 0x53 Stop Sound Current (unchanged)
0x53 0x54 Player List Header And Footer Current (unchanged)
0x54 0x55 NBT Query Response Current (unchanged)
0x55 0x56 Collect Item Current (unchanged)
0x56 0x57 Entity Teleport Current (unchanged)
0x57 0x58 Advancements Current (unchanged)
0x58 0x59 Entity Properties Current (unchanged)
0x59 0x5A Entity Effect Current (unchanged)
0x5A 0x5B Declare Recipes Current (unchanged)
0x5B 0x5C Tags Current (unchanged)

New/modified data types

No changes so far.

Entity Metadata

Warning.png Lots of shifts, of course

Living

Extends Entity.

Index Type Meaning Default
7 Byte Hand states, used to trigger blocking/eating/drinking animation. 0
Bit mask Meaning
0x01 Is hand active
0x02 Active hand (0 = main hand, 1 = offhand)
0x04 In riptide spin attack
8 Float Health 1.0
9 VarInt Potion effect color (or 0 if there is no effect) 0
10 Boolean Is potion effect ambient: reduces the number of particles generated by potions to 1/5 the normal amount false
11 VarInt Number of arrows in entity 0
12 VarInt Health added by absorption (based on the AbsorptionAmount tag) 0
12 13 OptBlockPos Sleeping location (from SleepingX, SleepingY, SleepingZ tags) Absent

Bee

Extends Insentient.

Index Type Meaning Default
16 Byte Flags 0
0x01 Unused
0x02 Is angry
0x04 Has stung
0x08 Has nectar
17 VarInt Anger 0

Wolf

Extends TameableAnimal.

Index Type Meaning Default
17 18 Float Damage taken (used for tail rotation) Value of health field (1.0)
18 Boolean Is begging false
19 VarInt Collar color (values are those used with dyes) 14 (Red)

Enderman

Extends Monster.

Index Type Meaning Default
15 Opt BlockID Carried block Absent
16 Boolean Is screaming false
17 Boolean Is stared at false

Trident

Extends Arrow.

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

Block Actions

No changes so far.

Inventories

No changes so far.

Plugin Channels

No changes so far.

Play

Clientbound

Spawn Mob

Sent by the server when a mob entity is spawned.

Packet ID State Bound To Field Name Field Type Notes
0x03 Play Client Entity ID VarInt
Entity UUID UUID
Type VarInt The type of mob. See Entities#Mobs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle
Head Pitch Angle
Velocity X Short Same units as Entity Velocity
Velocity Y Short Same units as Entity Velocity
Velocity Z Short Same units as Entity Velocity
Metadata Entity Metadata

Spawn Player

This packet is sent by the server when a player comes into visible range, not when a player joins.

This packet must be sent after the Player Info packet that adds the player data for the client to use when spawning a player. If the Player Info for the player spawned by this packet is not present when this packet arrives, Notchian clients will not spawn the player entity. The Player Info packet includes skin/cape data.

Servers can, however, safely spawn player entities for players not in visible range. The client appears to handle it correctly.

Packet ID State Bound To Field Name Field Type Notes
0x05 Play Client Entity ID VarInt Player's EID
Player UUID UUID See below for notes on offline mode and NPCs
X Double
Y Double
Z Double
Yaw Angle
Pitch Angle
Metadata Entity Metadata

When in online mode, the UUIDs must be valid and have valid skin blobs.

In offline mode, UUID v3 is used with the String OfflinePlayer:<player name>, encoded in UTF-8 (and case-sensitive).

For NPCs UUID v2 should be used. Note:

<+Grum> i will never confirm this as a feature you know that :)

In an example UUID, xxxxxxxx-xxxx-Yxxx-xxxx-xxxxxxxxxxxx, the UUID version is specified by Y. So, for UUID v3, Y will always be 3, and for UUID v2, Y will always be 2.

Update Block Entity

Sets the block entity associated with the block at the given location.

Packet ID State Bound To Field Name Field Type Notes
0x09 0x0A Play Client Location Position
Action Unsigned Byte The type of update to perform, see below
NBT Data NBT Tag Data to set. May be a TAG_END (0), in which case the block entity at the given location is removed (though this is not required since the client will remove the block entity automatically on chunk unload or block removal)

Action field:

  • 1: Set data of a mob spawner (everything except for SpawnPotentials: current delay, min/max delay, mob to be spawned, spawn count, spawn range, etc.)
  • 2: Set command block text (command and last execution status)
  • 3: Set the level, primary, and secondary powers of a beacon
  • 4: Set rotation and skin of mob head
  • 5: Declare a conduit
  • 6: Set base color and patterns on a banner
  • 7: Set the data for a Structure tile entity
  • 8: Set the destination for a end gateway
  • 9: Set the text on a sign
  • 10: Unused
  • 11: Declare a bed
  • 12: Set data of a jigsaw block
  • 13: Set items in a campfire
  • 14: Beehive information

Chunk Data

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

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

Packet ID State Bound To Field Name Field Type Notes
0x21 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).
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 Optional array of Integer 1024 biome IDs, ordered by x then z then d, in 4×4×4 blocks. Not present if full chunk is false.
Size VarInt Size of Data in bytes
Data Byte array See data structure in Chunk Format
Number of block entities VarInt Number of elements in the following array
Block entities Array of NBT Tag All block entities in the chunk. Use the x, y, and z tags in the NBT to determine their positions.

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

To get the biome at a coordinate, use biomes[((y >> 2) & 63) << 4 | ((z >> 2) & 3) << 2 | ((x >> 2) & 3)]

Data structure

The data section of the packet contains most of the useful data for the chunk.

Field Name Field Type Notes
Data Array of Chunk Section The number of elements in the array is equal to the number of bits set in Primary Bit Mask. Sections are sent bottom-to-top, i.e. the first section, if sent, extends from Y=0 to Y=15.
Biomes Optional Int Array Only sent if full chunk is true; 256 entries if present

Particle

Displays the named particle.

Packet ID State Bound To Field Name Field Type Notes
0x23 0x24 Play Client Particle ID Int The particle ID listed in the particle data type.
Long Distance Boolean If true, particle distance increases from 256 to 65536
X Float Double X position of the particle
Y Float Double Y position of the particle
Z Float Double Z position of the particle
Offset X Float This is added to the X position after being multiplied by random.nextGaussian()
Offset Y Float This is added to the Y position after being multiplied by random.nextGaussian()
Offset Z Float This is added to the Z position after being multiplied by random.nextGaussian()
Particle Data Float The data of each particle
Particle Count Int The number of particles to create
Data Varies The variable data listed in the particle data type.

Join Game

See Protocol Encryption for information on logging in.

Packet ID State Bound To Field Name Field Type Notes
0x25 0x26 Play Client Entity ID Int The player's Entity ID (EID)
Gamemode Unsigned Byte 0: Survival, 1: Creative, 2: Adventure, 3: Spectator. Bit 3 (0x8) is the hardcore flag.
Dimension Int Enum -1: Nether, 0: Overworld, 1: End; also, note that this is not a VarInt but instead a regular int.
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Max Players Unsigned Byte Was once used by the client to draw the player list, but now is ignored
Level Type String Enum (16) default, flat, largeBiomes, amplified, customized, buffet, default_1_1
View Distance VarInt Render distance (2-32)
Reduced Debug Info Boolean If true, a Notchian client shows reduced information on the debug screen. For servers in development, this should almost always be false.
Enable respawn screen Boolean Set to false when the doImmediateRespawn gamerule is true

Respawn

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

Packet ID State Bound To Field Name Field Type Notes
0x3A 0x3B Play Client Dimension Int Enum -1: The Nether, 0: The Overworld, 1: The End
Hashed seed Long First 8 bytes of the SHA-256 hash of the world's seed.
Gamemode Unsigned Byte 0: survival, 1: creative, 2: adventure, 3: spectator. The hardcore flag is not included
Level Type String (16) Same as Join Game

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

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

Serverbound

No changes so far.

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 498 571)
Server Address String Hostname or IP, e.g. localhost or 127.0.0.1, that was used to connect. The Notchian server does not use this information. Note that SRV records are a complete redirect, e.g. if _minecraft._tcp.example.com points to mc.example.org, users connecting to example.com will provide mc.example.org as server address in addition to connecting to it.
Server Port Unsigned Short Default is 25565. The Notchian server does not use this information.
Next State VarInt Enum 1 for status, 2 for login

Status

Clientbound

No changes so far.

Serverbound

No changes so far.

Login

Clientbound

No changes so far.

Serverbound

No changes so far.