Pre-release protocol
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This page documents the changes from the last stable Minecraft release (currently 1.12.2, protocol 340) to the current pre-release (currently 17w45a, protocol 343). 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 | |||
| 0x0E | Tab-Complete (clientbound) | Current | |
| Chat Message (clientbound) | Current | (unchanged) | |
| Multi Block Change | Current | (unchanged) | |
| 0x10 | Unknown 0x10 | Pre | |
| 0x19 | Named Sound Effect | Current | Pre |
| 0x22 | Particle | Current | Pre |
| 0x49 | Unknown 0x49 | Pre | |
| Sound Effect | Current | (unchanged) | |
| Player List Header And Footer | Current | (unchanged) | |
| Collect Item | Current | (unchanged) | |
| Entity Teleport | Current | (unchanged) | |
| Advancements | Current | (unchanged) | |
| Entity Properties | Current | (unchanged) | |
| Entity Effect | Current | (unchanged) | |
| Play clientbound | |||
| 0x01 | Tab-Complete (serverbound) | Current | |
| Chat Message (serverbound) | Current | (unchanged) | |
| Client Status | Current | (unchanged) | |
| Client Settings | Current | (unchanged) | |
| Confirm Transaction (serverbound) | Current | (unchanged) | |
| Enchant Item | Current | (unchanged) | |
| Click Window | Current | (unchanged) | |
| Close Window (serverbound) | Current | (unchanged) | |
| Plugin Message (serverbound) | Current | (unchanged) | |
| Use Entity | Current | (unchanged) | |
| Keep Alive (serverbound) | Current | (unchanged) | |
| Player | Current | (unchanged) | |
| Player Position | Current | (unchanged) | |
| Player Position And Look (serverbound) | Current | (unchanged) | |
| Player Look | Current | (unchanged) | |
| Vehicle Move (serverbound) | Current | (unchanged) | |
| Steer Boat | Current | (unchanged) | |
| Craft Recipe Request | Current | (unchanged) | |
| Player Abilities (serverbound) | Current | (unchanged) | |
| Player Digging | Current | (unchanged) | |
| Entity Action | Current | (unchanged) | |
| Steer Vehicle | Current | (unchanged) | |
| Crafting Book Data | Current | (unchanged) | |
| Resource Pack Status | Current | (unchanged) | |
| Advancement Tab | Current | (unchanged) | |
| Held Item Change (serverbound) | Current | (unchanged) | |
| Creative Inventory Action | Current | (unchanged) | |
| Update Sign | Current | (unchanged) | |
| Animation (serverbound) | Current | (unchanged) | |
| Spectate | Current | (unchanged) | |
| Player Block Placement | Current | (unchanged) | |
| Use Item | Current | (unchanged) | |
New/modified data types
No changes so far.
Block Actions
No changes so far.
Play
Clientbound
Unknown 0x10
Unknown, appears to have no data.
Named Sound Effect
- See also: #Sound Effect
Used to play a sound effect on the client. Custom sounds may be added by resource packs.
| Packet ID | State | Bound To | Field Name | Field Type | Notes |
|---|---|---|---|---|---|
| 0x19 | Play | Client | Sound Name | All sound effect names as of 1.12.2 can be seen here. | |
| Sound Category | VarInt Enum | The category that this sound will be played from (current categories) | |||
| Effect Position X | Int | Effect X multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part) | |||
| Effect Position Y | Int | Effect Y multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part) | |||
| Effect Position Z | Int | Effect Z multiplied by 8 (fixed-point number with only 3 bits dedicated to the fractional part) | |||
| Volume | Float | 1 is 100%, can be more | |||
| Pitch | Float | Float between 0.5 and 2.0 by Notchian clients |
Particle
Changes unknown.
Unknown 0x49
| Packet ID | State | Bound To | Field Name | Field Type | Notes |
|---|---|---|---|---|---|
| 0x49 | Play | Client | Flags | Byte | Appears to control whether the following fields are present. 0-3. |
| Optional VarInt enum | Only if flags is 3 or 1 | ||||
| Optional Identifier | Only if flags is 2 or 3 |
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 |
| 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.
