Struct NetworkProtocolVersion

The NetworkProtocolVersion is a singleton entity that is automatically created by the GhostCollectionSystem (once the GhostCollection is ready), and is used to verify client and server compatibility.

The protocol version is composed by different part:

- The NetCode package version.

- A user defined GameProtocolVersion game version, that identify the version of your game

- A unique hash of all the IRpcCommand and ICommandData that is used to verify both client and server recognize the same rpc and command and that can serialize/deserialize them in the same way

- A unique hash of all the replicated Unity.Entities.IComponentData and Unity.Entities.IBufferElementData that is used to verify both client and server can serialize/deserialize all the replicated component present in the ghosts

When a client tries to connect to the server, as part of the initial handshake, they exchange their protocol version to validate they are both using same version. If the version mismatch, the connection is forcibly closed.

Implements

IComponentData

IQueryTypeParameter

Inherited Members

ValueType.Equals(object)

ValueType.GetHashCode()

object.Equals(object, object)

object.GetType()

object.ReferenceEquals(object, object)

Namespace: Unity.NetCode

Assembly: Unity.NetCode.dll

Syntax

public struct NetworkProtocolVersion : IComponentData, IQueryTypeParameter

Fields

ComponentCollectionVersion

A unique hash calculated on all the serialized components that can be used to check if the client can properly decode the snapshots.

Declaration

public ulong ComponentCollectionVersion

Field Value

Type	Description
ulong

GameVersion

The user specific game version the server and client are using. 0 by default, unless the GameProtocolVersion is used to customise it.

Declaration

public int GameVersion

Field Value

Type	Description
int

NetCodeVersion

The NetCode package version

Declaration

public int NetCodeVersion

Field Value

Type	Description
int

RpcCollectionVersion

A unique hash computed of all the RPC and commands, used to check if the server and client have the same messages and with compatible data and serialization.

Declaration

public ulong RpcCollectionVersion

Field Value

Type	Description
ulong

k_NetCodeVersion

The integer used to determine a compatible version of the NetCode package.

Declaration

public const int k_NetCodeVersion = 2

Field Value

Type	Description
int

Remarks

Note: When we increment this, it implies netcode is not compatible with a previous version. However, there is no guarantee you'll get a graceful error if connecting to an incompatible version, because, if we change the serialization of the protocol version (e.g. by changing RPC header size), we almost certainly cannot deserialize this value correctly anyway.
NOTE: Netcode makes no guarantees that any major, minor, or patch versions of netcode are compatible with each other. We only guarantee that the exact version is compatible with itself.

Methods

ToFixedString()

Helper.

Declaration

public FixedString512Bytes ToFixedString()

Returns

Type	Description
FixedString512Bytes	"NPV[NetCodeVersion:0, GameVersion:0, RpcCollection:00000000000, ComponentCollection:00000000000]"

Implements

Unity.Entities.IComponentData

Unity.Entities.IQueryTypeParameter