Class NetworkManager

The main component of the library

Inheritance
object
Object
Component
Behaviour
MonoBehaviour
NetworkManager
Implements
Inherited Members
Component.GetComponent<T>()
Component.TryGetComponent<T>(out T)
Component.GetComponentInChildren<T>()
Component.GetComponentsInChildren<T>()
Component.GetComponentInParent<T>()
Component.GetComponentsInParent<T>()
Component.GetComponents<T>()
Object.GetHashCode()
Object.InstantiateAsync<T>(T)
Object.InstantiateAsync<T>(T, Transform)
Object.InstantiateAsync<T>(T, Vector3, Quaternion)
Object.InstantiateAsync<T>(T, Transform, Vector3, Quaternion)
Object.Instantiate<T>(T)
Object.Instantiate<T>(T, Vector3, Quaternion)
Object.Instantiate<T>(T, Vector3, Quaternion, Transform)
Object.Instantiate<T>(T, Transform)
Object.DestroyObject(Object)
Object.FindObjectsOfType<T>()
Object.FindObjectsByType<T>(FindObjectsSortMode)
Object.FindObjectsByType<T>(FindObjectsInactive, FindObjectsSortMode)
Object.FindObjectOfType<T>()
Object.FindFirstObjectByType<T>()
Object.FindAnyObjectByType<T>()
Object.FindFirstObjectByType<T>(FindObjectsInactive)
Object.FindAnyObjectByType<T>(FindObjectsInactive)
Namespace: Unity.Netcode
Assembly: Unity.Netcode.Runtime.dll
Syntax
[AddComponentMenu("Netcode/Network Manager", -100)]
public class NetworkManager : MonoBehaviour, INetworkUpdateSystem

Fields

LogLevel

The log level to use

Declaration
[HideInInspector]
public LogLevel LogLevel
Field Value
Type Description
LogLevel

NetworkConfig

The current netcode project configuration

Declaration
[HideInInspector]
public NetworkConfig NetworkConfig
Field Value
Type Description
NetworkConfig

NetworkManagerExpanded

Declaration
[HideInInspector]
public bool NetworkManagerExpanded
Field Value
Type Description
bool

OnFetchLocalPlayerPrefabToSpawn

Distributed Authority Mode When a callback is assigned, this provides control over what player prefab a client will be using. This is invoked only when AutoSpawnPlayerPrefabClientSide is enabled.

Declaration
public NetworkManager.OnFetchLocalPlayerPrefabToSpawnDelegateHandler OnFetchLocalPlayerPrefabToSpawn
Field Value
Type Description
NetworkManager.OnFetchLocalPlayerPrefabToSpawnDelegateHandler

PendingClients

Gets a dictionary of the clients that have been accepted by the transport but are still pending by the Netcode. This is only populated on the server.

Declaration
public readonly Dictionary<ulong, PendingClient> PendingClients
Field Value
Type Description
Dictionary<ulong, PendingClient>

RpcTarget

Provides access to the various SendTo targets at runtime, as well as runtime-bound targets like Single(ulong, RpcTargetUse), Unity.Netcode.RpcTarget.Group(NativeArray<ulong>), Unity.Netcode.RpcTarget.Group(NativeList<ulong>), Unity.Netcode.RpcTarget.Group(ulong[]), Unity.Netcode.RpcTarget.Group<T>(T), Unity.Netcode.RpcTarget.Not(ulong), Unity.Netcode.RpcTarget.Not(NativeArray<ulong>), Unity.Netcode.RpcTarget.Not(NativeList<ulong>), Unity.Netcode.RpcTarget.Not(ulong[]), and Unity.Netcode.RpcTarget.Not<T>(T)

Declaration
public RpcTarget RpcTarget
Field Value
Type Description
RpcTarget

RunInBackground

Gets or sets if the application should be set to run in background

Declaration
[HideInInspector]
public bool RunInBackground
Field Value
Type Description
bool

ServerClientId

The client id used to represent the server

Declaration
public const ulong ServerClientId = 0
Field Value
Type Description
ulong

Properties

AutoSpawnPlayerPrefabClientSide

Distributed Authority Mode When enabled, the player prefab will be automatically spawned on the newly connected client-side.

Declaration
public bool AutoSpawnPlayerPrefabClientSide { get; }
Property Value
Type Description
bool
Remarks

Refer to AutoSpawnPlayerPrefabClientSide to enable/disable automatic spawning of the player prefab. Alternately, override the FetchLocalPlayerPrefabToSpawn() to control what prefab the player should spawn.

CMBServiceConnection

Distributed Authority Mode Gets whether the NetworkManager is connected to a distributed authority state service. DAHost to determine if the instance is mocking the state service.

Declaration
public bool CMBServiceConnection { get; }
Property Value
Type Description
bool

ConnectedClients

Gets a dictionary of connected clients and their clientId keys.

Declaration
public IReadOnlyDictionary<ulong, NetworkClient> ConnectedClients { get; }
Property Value
Type Description
IReadOnlyDictionary<ulong, NetworkClient>

ConnectedClientsIds

Gets a list of just the IDs of all connected clients.

Declaration
public IReadOnlyList<ulong> ConnectedClientsIds { get; }
Property Value
Type Description
IReadOnlyList<ulong>

ConnectedClientsList

Gets a list of connected clients.

Declaration
public IReadOnlyList<NetworkClient> ConnectedClientsList { get; }
Property Value
Type Description
IReadOnlyList<NetworkClient>

ConnectedHostname

The current host name we are connected to, used to validate certificate

Declaration
public string ConnectedHostname { get; }
Property Value
Type Description
string

ConnectionApprovalCallback

The callback to invoke during connection approval. Allows client code to decide whether or not to allow incoming client connection

Declaration
public Action<NetworkManager.ConnectionApprovalRequest, NetworkManager.ConnectionApprovalResponse> ConnectionApprovalCallback { get; set; }
Property Value
Type Description
Action<NetworkManager.ConnectionApprovalRequest, NetworkManager.ConnectionApprovalResponse>

CurrentSessionOwner

Declaration
public ulong CurrentSessionOwner { get; }
Property Value
Type Description
ulong

CustomMessagingManager

Gets the CustomMessagingManager for this NetworkManager

Declaration
public CustomMessagingManager CustomMessagingManager { get; }
Property Value
Type Description
CustomMessagingManager

DAHost

Distributed Authority Mode Gets whether the current NetworkManager is running as a mock distributed authority state service (DAHost)

Declaration
public bool DAHost { get; }
Property Value
Type Description
bool

DisconnectReason

When disconnected from the server, the server may send a reason. If a reason was sent, this property will tell client code what the reason was. It should be queried after the OnClientDisconnectCallback is called

Declaration
public string DisconnectReason { get; }
Property Value
Type Description
string

DistributedAuthorityMode

Distributed Authority Mode Returns true if the current session is running in distributed authority mode.

Declaration
public bool DistributedAuthorityMode { get; }
Property Value
Type Description
bool

IsApproved

Is true when the client has been approved.

Declaration
public bool IsApproved { get; }
Property Value
Type Description
bool
Remarks

This only reflects the client's approved status and does not mean the client has finished the connection and synchronization process. The server-host will always be approved upon being starting the NetworkManager NetworkClient.IsConnectedClient

IsClient

Gets Whether or not a client is running

Declaration
public bool IsClient { get; }
Property Value
Type Description
bool

IsConnectedClient

When true, the client is connected, approved, and synchronized with the server. IsConnected
IsApproved

Declaration
public bool IsConnectedClient { get; }
Property Value
Type Description
bool

IsHost

Gets if we are running as host

Declaration
public bool IsHost { get; }
Property Value
Type Description
bool

IsListening

Is true when a server or host is listening for connections. Is true when a client is connecting or connected to a network session. Is false when not listening, connecting, or connected.

Declaration
public bool IsListening { get; }
Property Value
Type Description
bool

IsServer

Gets Whether or not a server is running

Declaration
public bool IsServer { get; }
Property Value
Type Description
bool

LocalClient

Gets the local NetworkClient for this client.

Declaration
public NetworkClient LocalClient { get; }
Property Value
Type Description
NetworkClient

LocalClientId

Returns ServerClientId if IsServer or LocalClientId if not

Declaration
public ulong LocalClientId { get; }
Property Value
Type Description
ulong

LocalTime

The local NetworkTime

Declaration
public NetworkTime LocalTime { get; }
Property Value
Type Description
NetworkTime

MaximumFragmentedMessageSize

Sets the maximum size of a message (or message batch) passed through the transport with the ReliableFragmented delivery. Warning: setting this value too low may result in the SDK becoming non-functional with projects that have a large number of NetworkBehaviours or NetworkVariables, as the SDK relies on the transport's ability to fragment some messages when they grow beyond the MTU size.

Declaration
public int MaximumFragmentedMessageSize { get; set; }
Property Value
Type Description
int

MaximumTransmissionUnitSize

Sets the maximum size of a single non-fragmented message (or message batch) passed through the transport. This should represent the transport's default MTU size, minus any transport-level overhead. This value will be used for any remote endpoints that haven't had per-endpoint MTUs set. This value is also used as the size of the temporary buffer used when serializing a single message (to avoid serializing multiple times when sending to multiple endpoints), and thus should be large enough to ensure it can hold each message type. This value defaults to 1296.

Declaration
public int MaximumTransmissionUnitSize { get; set; }
Property Value
Type Description
int

NetworkTickSystem

Accessor property for the NetworkTickSystem of the NetworkManager.

Declaration
public NetworkTickSystem NetworkTickSystem { get; }
Property Value
Type Description
NetworkTickSystem

NetworkTimeSystem

Accessor property for the NetworkTimeSystem of the NetworkManager. Prefer the use of the LocalTime and ServerTime properties

Declaration
public NetworkTimeSystem NetworkTimeSystem { get; }
Property Value
Type Description
NetworkTimeSystem

PrefabHandler

The NetworkPrefabHandler instance created after starting the NetworkManager

Declaration
public NetworkPrefabHandler PrefabHandler { get; }
Property Value
Type Description
NetworkPrefabHandler

SceneManager

The NetworkSceneManager instance created after starting the NetworkManager

Declaration
public NetworkSceneManager SceneManager { get; }
Property Value
Type Description
NetworkSceneManager

ServerIsHost

Gets whether or not the current server (local or remote) is a host - i.e., also a client

Declaration
public bool ServerIsHost { get; }
Property Value
Type Description
bool

ServerTime

The NetworkTime on the server

Declaration
public NetworkTime ServerTime { get; }
Property Value
Type Description
NetworkTime

ShutdownInProgress

Can be used to determine if the NetworkManager is currently shutting itself down

Declaration
public bool ShutdownInProgress { get; }
Property Value
Type Description
bool

Singleton

The singleton instance of the NetworkManager

Declaration
public static NetworkManager Singleton { get; }
Property Value
Type Description
NetworkManager

SpawnManager

Gets the SpawnManager for this NetworkManager

Declaration
public NetworkSpawnManager SpawnManager { get; }
Property Value
Type Description
NetworkSpawnManager

Methods

AddNetworkPrefab(GameObject)

AddNetworkPrefab(GameObject)

Declaration
public void AddNetworkPrefab(GameObject prefab)
Parameters
Type Name Description
GameObject prefab
Exceptions
Type Condition
Exception

DisconnectClient(ulong)

Disconnects the remote client.

Declaration
public void DisconnectClient(ulong clientId)
Parameters
Type Name Description
ulong clientId

The ClientId to disconnect

DisconnectClient(ulong, string)

Disconnects the remote client.

Declaration
public void DisconnectClient(ulong clientId, string reason = null)
Parameters
Type Name Description
ulong clientId

The ClientId to disconnect
string reason

Disconnection reason. If set, client will receive a DisconnectReasonMessage and have the reason available in the NetworkManager.DisconnectReason property

GetNetworkPrefabOverride(GameObject)

GetNetworkPrefabOverride(GameObject)

Declaration
public GameObject GetNetworkPrefabOverride(GameObject gameObject)
Parameters
Type Name Description
GameObject gameObject

the GameObject to be checked for a NetworkManager defined NetworkPrefab override
Returns
Type Description
GameObject

a GameObject that is either the override or if no overrides exist it returns the same as the one passed in as a parameter

GetPeerMTU(ulong)

Queries the current MTU size for a client. If no MTU has been set for that client, will return MaximumTransmissionUnitSize

Declaration
public int GetPeerMTU(ulong clientId)
Parameters
Type Name Description
ulong clientId
Returns
Type Description
int

NetworkUpdate(NetworkUpdateStage)

The update method that is being executed in the context of related NetworkUpdateStage.

Declaration
public void NetworkUpdate(NetworkUpdateStage updateStage)
Parameters
Type Name Description
NetworkUpdateStage updateStage

The NetworkUpdateStage that is being executed.

OnValidateComponent()

Declaration
protected virtual void OnValidateComponent()

RemoveNetworkPrefab(GameObject)

RemoveNetworkPrefab(GameObject)

Declaration
public void RemoveNetworkPrefab(GameObject prefab)
Parameters
Type Name Description
GameObject prefab

SetPeerMTU(ulong, int)

Set the maximum transmission unit for a specific peer. This determines the maximum size of a message batch that can be sent to that client. If not set for any given client, MaximumTransmissionUnitSize will be used instead.

Declaration
public void SetPeerMTU(ulong clientId, int size)
Parameters
Type Name Description
ulong clientId
int size

SetSingleton()

Set this NetworkManager instance as the static NetworkManager singleton

Declaration
public void SetSingleton()

Shutdown(bool)

Globally shuts down the library. Disconnects clients if connected and stops server if running.

Declaration
public void Shutdown(bool discardMessageQueue = false)
Parameters
Type Name Description
bool discardMessageQueue

If false, any messages that are currently in the incoming queue will be handled, and any messages in the outgoing queue will be sent, before the shutdown is processed. If true, NetworkManager will shut down immediately, and any unprocessed or unsent messages will be discarded.

StartClient()

Starts a client

Declaration
public bool StartClient()
Returns
Type Description
bool

(true/false) returns true if NetworkManager started in client mode successfully.

StartHost()

Starts a Host

Declaration
public bool StartHost()
Returns
Type Description
bool

(true/false) returns true if NetworkManager started in host mode successfully.

StartServer()

Starts a server

Declaration
public bool StartServer()
Returns
Type Description
bool

(true/false) returns true if NetworkManager started in server mode successfully.

Events

OnClientConnectedCallback

The callback to invoke once a client connects. This callback is only ran on the server and on the local client that connects.

It is recommended to use OnConnectionEvent instead, as this will eventually be deprecated

Declaration
public event Action<ulong> OnClientConnectedCallback
Event Type
Type Description
Action<ulong>

OnClientDisconnectCallback

The callback to invoke when a client disconnects. This callback is only ran on the server and on the local client that disconnects.

It is recommended to use OnConnectionEvent instead, as this will eventually be deprecated

Declaration
public event Action<ulong> OnClientDisconnectCallback
Event Type
Type Description
Action<ulong>

OnClientStarted

The callback to invoke once the local client is ready

Declaration
public event Action OnClientStarted
Event Type
Type Description
Action

OnClientStopped

The callback to invoke once the local client stops

Declaration
public event Action<bool> OnClientStopped
Event Type
Type Description
Action<bool>
Remarks

The parameter states whether the client was running in host mode

OnConnectionEvent

The callback to invoke on any connection event. See ConnectionEvent and ConnectionEventData for more info.

Declaration
public event Action<NetworkManager, ConnectionEventData> OnConnectionEvent
Event Type
Type Description
Action<NetworkManager, ConnectionEventData>

OnDestroying

Subscribe to this static event to get notifications when a NetworkManager instance is being destroyed.

Declaration
public static event Action<NetworkManager> OnDestroying
Event Type
Type Description
Action<NetworkManager>

OnInstantiated

Subscribe to this static event to get notifications when a NetworkManager instance has been instantiated.

Declaration
public static event Action<NetworkManager> OnInstantiated
Event Type
Type Description
Action<NetworkManager>

OnReanticipate

This callback is called after all individual OnReanticipate calls on AnticipatedNetworkVariable and AnticipatedNetworkTransform values have been invoked. The first parameter is a hash set of all the variables that have been changed on this frame (you can detect a particular variable by checking if the set contains it), while the second parameter is a set of all anticipated network transforms that have been changed. Both are passed as their base class type.

The third parameter is the local time corresponding to the current authoritative server state (i.e., to determine the amount of time that needs to be re-simulated, you will use NetworkManager.LocalTime.Time - authorityTime).

Declaration
public event NetworkManager.ReanticipateDelegate OnReanticipate
Event Type
Type Description
NetworkManager.ReanticipateDelegate

OnServerStarted

This callback is invoked when the local server is started and listening for incoming connections.

Declaration
public event Action OnServerStarted
Event Type
Type Description
Action

OnServerStopped

This callback is invoked once the local server is stopped.

Declaration
public event Action<bool> OnServerStopped
Event Type
Type Description
Action<bool>

OnSessionOwnerPromoted

Network Topology: Distributed Authority When a new session owner is promoted, this event is triggered on all connected clients

Declaration
public event NetworkManager.OnSessionOwnerPromotedDelegateHandler OnSessionOwnerPromoted
Event Type
Type Description
NetworkManager.OnSessionOwnerPromotedDelegateHandler

OnTransportFailure

The callback to invoke if the NetworkTransport fails.

Declaration
public event Action OnTransportFailure
Event Type
Type Description
Action
Remarks

A failure of the transport is always followed by the NetworkManager shutting down. Recovering from a transport failure would normally entail reconfiguring the transport (e.g. re-authenticating, or recreating a new service allocation depending on the transport) and restarting the client/server/host.

Implements

Extension Methods