Protocol for r/21_u9 NetworkProtocolVersion 818

[oswaldolb]

Minecraft Network Protocol Docs 5/21/25

For r21_u9, Network Protocol Version 818

New Packets

ServerScriptDebugDrawerPacket:

• Added mShapes (std::vector) [PacketShapeData type definition in New Types]

Packet Changes

ResourcePacksInfoPacket:

• Added mData.mForceDisableVibrantVisuals (bool)

Removed Packets

• SetMovementAuthorityMode (now SetMovementAuthorityMode_DEPRECATED)

New Types

PacketShapeData:

• Added mNetworkId (uint64_t)
• Added mShapeType (brstd::optionalScriptModuleDebugUtilities::ScriptDebugShapeType) [ScriptModuleDebugUtilities::ScriptDebugShapeType enum definition in New Enums]
• Added mLocation (brstd::optional)
• Added mRotation (brstd::optional)
• Added mScale (brstd::optional)
• Added mColor (brstd::optionalmce::Color)
• Added mTimeLeftTotalSec (brstd::optional)
• Added mText (brstd::optionalstd::string)
• Added mBoxBound (brstd::optional)
• Added mEndLocation (brstd::optional)
• Added mArrowHeadLength (brstd::optional)
• Added mArrowHeadRadius (brstd::optional)
• Added mNumSegments (brstd::optional)

Other Changes to Types

CameraInstruction::SetInstruction:

• Added mRemoveIgnoreStartingValuesComponent (bool)

LevelSettings:

• Added mOwnerId (std::string)

SharedTypes::v1_21_80::CameraPreset:

• Removed mAlignTargetAndCameraForward

SubChunkPacket::HeightmapData:

• Added mRenderHeightMapType (enum SubChunkPacket::HeightMapDataType)
• Added mSubchunkRenderHeightMap (std::array<std::array<int8_t, LevelConstants::CHUNK_WIDTH>, LevelConstants::CHUNK_WIDTH>)

SyncedPlayerMovementSettings:

• Removed mAuthorityMode

New Enums

ScriptModuleDebugUtilities::ScriptDebugShapeType:

• Added Line (0) []
• Added Box (1) []
• Added Sphere (2) []
• Added Circle (3) []
• Added Text (4) []
• Added Arrow (5) []
• Added NumShapeTypes (6) []

Enum Changes

ActorFlags:

• Added BODY_ROTATION_ALWAYS_FOLLOWS_HEAD (124) []
• Displaced Count

Connection::DisconnectFailReason:

• Added RealmsTimelineRequired (119) []
• Added GuestWithoutHost (120) []
• Added FailedToJoinExperience (121) []

MinecraftPacketIds:

• Added SetMovementAuthorityMode_DEPRECATED (319) []
• Added ServerScriptDebugDrawerPacket (328) []
• Changed EndId from 328 to 329
• Removed SetMovementAuthorityMode

PlayerActionType:

• Added DEPRECATED_ClientAckServerData (36) [Corresponds to Player Auth Input InputData::ClientAckServerData bit 44
  Not sent when using server authoritative movement as specified in StartGamePacket
  This is now deprecated because only server authoritative movement exist ]
• Removed ClientAckServerData

SharedTypes::Legacy::LevelSoundEvent:

• Added ImitateDrowned (531) []
• Added ImitateCreaking (532) []
• Added BundleInsertFail (533) []
• Added SpongeAbsorb (534) []
• Added CreakingHeartTrail (536) []
• Added CreakingHeartSpawn (537) []
• Added Activate (538) []
• Added Deactivate (539) []
• Added Freeze (540) []
• Added Unfreeze (541) []
• Added Open (542) []
• Added OpenLong (543) []
• Added Close (544) []
• Added CloseLong (545) []
• Added ImitatePhantom (546) []
• Added ImitateZoglin (547) []
• Added ImitateGuardian (548) []
• Added ImitateRavager (549) []
• Added ImitatePillager (550) []
• Added PlaceInWater (551) []
• Added StateChange (552) []
• Added ImitateHappyGhast (553) []
• Added UnequipGeneric (554) []
• Added RecordTears (555) []
• Added TheEndLightFlash (556) []
• Added LeadLeash (557) []
• Added LeadUnleash (558) []
• Added LeadBreak (559) []
• Added Unsaddle (560) []
• Changed Undefined from 531 to 561
• Removed ImitateIllusionIllager

SubChunkPacket::HeightMapDataType:

• Added AllCopied (4) []