Pre-release protocol
This page documents the changes from the last stable Minecraft release (currently 1.11.2, protocol 316) to the current pre-release (currently 17w13a, protocol 318). 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 |
New/modified data types
Entity Metadata
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 is an array of entries, each of which looks like the following:
| Name | Type | Meaning |
|---|---|---|
| Index | Unsigned Byte | Unique index key determining the meaning of the following value, see the table below. If this is 0xff then the it is the end of the Entity Metadata array and no more is read.
|
| Type | Optional Byte Enum | Only if Index is not 0xff; the type of the index, see the table below
|
| Value | Optional value of Type | Only if Index is not 0xff: the value of the metadata field
|
| Value of Type field | Type of Value field | Notes |
|---|---|---|
| 0 | Byte | |
| 1 | VarInt | |
| 2 | Float | |
| 3 | String | |
| 4 | Chat | |
| 5 | Slot | |
| 6 | Boolean | |
| 7 | Rotation | 3 floats: rotation on x, rotation on y, rotation on z |
| 8 | Position | |
| 9 | OptPosition (Boolean + Optional Position) | Position is present if the Boolean is set to true |
| 10 | Direction (VarInt) | (Down = 0, Up = 1, North = 2, South = 3, West = 4, East = 5) |
| 11 | OptUUID (Boolean + Optional UUID) | UUID is present if the Boolean is set to true |
| 12 | OptBlockID (VarInt) | 0 for absent otherwise, id << 4 | data
|
| 13 | NBT Tag |
Entity classes also recursively inherit fields from classes they extend.
Parrot
Extends TameableAnimal.
| Index | Type | Meaning | Default | |
|---|---|---|---|---|
| 15 | VarInt | Variant (values ranging from 0 to 3) | 0 | |
Player
Extends Living.
| Index | Type | Meaning | Default | |
|---|---|---|---|---|
| 11 | Float | Additional Hearts | 0.0 | |
| 12 | VarInt | Score | 0 | |
| 13 | Byte | The Displayed Skin Parts bit mask that is sent in Client Settings | 0 | |
| Bit mask | Meaning | |||
| 0x01 | Cape enabled | |||
| 0x02 | Jacket enabled | |||
| 0x04 | Left sleeve enabled | |||
| 0x08 | Right sleeve enabled | |||
| 0x10 | Left pants leg enabled | |||
| 0x20 | Right pants leg enabled | |||
| 0x40 | Hat enabled | |||
| 0x80 | Unused | |||
| 14 | Byte | Main hand (0 : Left, 1 : Right) | 1 | |
| 15 | NBT Tag | Left shoulder entity data | ||
| 16 | NBT Tag | Right shoulder entity data | ||
Block Actions
No changes so far.
Plugin Channels
No changes so far.
Handshaking
Clientbound
No changes so far.
Serverbound
No changes so far.
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 |
| 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. | |||
| 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.
