Class UnityTransport

The Netcode for GameObjects NetworkTransport for UnityTransport. Note: This is highly recommended to use over UNet.

Inheritance
object
Object
Component
Behaviour
MonoBehaviour
NetworkTransport
UnityTransport
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.Transports.UTP
Assembly: Unity.Netcode.Runtime.dll
Syntax
[AddComponentMenu("Netcode/Unity Transport")]
public class UnityTransport : NetworkTransport, INetworkStreamDriverConstructor

Fields

ConnectionData

The connection (address) data for this UnityTransport instance. This is where you can change IP Address, Port, or server's listen address. UnityTransport.ConnectionAddressData

Declaration
public UnityTransport.ConnectionAddressData ConnectionData
Field Value
Type Description
UnityTransport.ConnectionAddressData

DebugSimulator

Can be used to simulate poor network conditions such as:

Declaration
[Obsolete("DebugSimulator is no longer supported and has no effect. Use Network Simulator from the Multiplayer Tools package.", false)]
public UnityTransport.SimulatorParameters DebugSimulator
Field Value
Type Description
UnityTransport.SimulatorParameters

InitialMaxPacketQueueSize

The default maximum (receive) packet queue size

Declaration
public const int InitialMaxPacketQueueSize = 128
Field Value
Type Description
int

InitialMaxPayloadSize

The default maximum payload size

Declaration
public const int InitialMaxPayloadSize = 6144
Field Value
Type Description
int

InitialMaxSendQueueSize

The default maximum send queue size

Declaration
[Obsolete("MaxSendQueueSize is now determined dynamically (can still be set programmatically using the MaxSendQueueSize property). This initial value is not used anymore.", false)]
public const int InitialMaxSendQueueSize = 98304
Field Value
Type Description
int

m_Driver

Declaration
protected NetworkDriver m_Driver
Field Value
Type Description
NetworkDriver

m_NetworkManager

NetworkManager associated to this transport instance

Declaration
protected NetworkManager m_NetworkManager
Field Value
Type Description
NetworkManager

s_DriverConstructor

The global INetworkStreamDriverConstructor implementation

Declaration
public static INetworkStreamDriverConstructor s_DriverConstructor
Field Value
Type Description
INetworkStreamDriverConstructor

Properties

ConnectTimeoutMS

Timeout in milliseconds indicating how long we will wait until we send a new connection attempt.

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

DisconnectTimeoutMS

Inactivity timeout after which a connection will be disconnected.

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

The connection needs to receive data from the connected endpoint within this timeout. Note that with heartbeats enabled, simply not sending any data will not be enough to trigger this timeout (since heartbeats count as connection events).

DriverConstructor

Returns either the global INetworkStreamDriverConstructor implementation or the current UnityTransport instance

Declaration
public INetworkStreamDriverConstructor DriverConstructor { get; }
Property Value
Type Description
INetworkStreamDriverConstructor

HeartbeatTimeoutMS

Timeout in milliseconds after which a heartbeat is sent if there is no activity.

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

MaxConnectAttempts

The maximum amount of connection attempts we will try before disconnecting.

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

MaxPacketQueueSize

The maximum amount of packets that can be in the internal send/receive queues.

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

Basically this is how many packets can be sent/received in a single update/frame.

MaxPayloadSize

The maximum size of an unreliable payload that can be handled by the transport.

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

MaxSendQueueSize

The maximum size in bytes of the transport send queue.

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

The send queue accumulates messages for batching and stores messages when other internal send queues are full. Note that there should not be any need to set this value manually since the send queue size is dynamically sized based on need.

This value should only be set if you have particular requirements (e.g. if you want to limit the memory usage of the send queues). Note however that setting this value too low can easily lead to disconnections under heavy traffic.

Protocol

The current ProtocolType used by the transport

Declaration
public UnityTransport.ProtocolType Protocol { get; }
Property Value
Type Description
UnityTransport.ProtocolType

ServerClientId

The client id used to represent the server.

Declaration
public override ulong ServerClientId { get; }
Property Value
Type Description
ulong
Overrides

UseEncryption

Declaration
public bool UseEncryption { get; set; }
Property Value
Type Description
bool

UseWebSockets

Declaration
public bool UseWebSockets { get; set; }
Property Value
Type Description
bool

Methods

Connect(NetworkEndpoint)

Declaration
protected virtual NetworkConnection Connect(NetworkEndpoint serverEndpoint)
Parameters
Type Name Description
NetworkEndpoint serverEndpoint
Returns
Type Description
NetworkConnection

CreateDriver(UnityTransport, out NetworkDriver, out NetworkPipeline, out NetworkPipeline, out NetworkPipeline)

Creates the internal NetworkDriver

Declaration
public void CreateDriver(UnityTransport transport, out NetworkDriver driver, out NetworkPipeline unreliableFragmentedPipeline, out NetworkPipeline unreliableSequencedFragmentedPipeline, out NetworkPipeline reliableSequencedPipeline)
Parameters
Type Name Description
UnityTransport transport

The owner transport
NetworkDriver driver

The driver
NetworkPipeline unreliableFragmentedPipeline

The UnreliableFragmented NetworkPipeline
NetworkPipeline unreliableSequencedFragmentedPipeline

The UnreliableSequencedFragmented NetworkPipeline
NetworkPipeline reliableSequencedPipeline

The ReliableSequenced NetworkPipeline

DisconnectLocalClient()

Disconnects the local client from the remote

Declaration
public override void DisconnectLocalClient()
Overrides

DisconnectRemoteClient(ulong)

Disconnects a remote client from the server

Declaration
public override void DisconnectRemoteClient(ulong clientId)
Parameters
Type Name Description
ulong clientId

The client to disconnect
Overrides

GetCurrentRtt(ulong)

Gets the current RTT for a specific client

Declaration
public override ulong GetCurrentRtt(ulong clientId)
Parameters
Type Name Description
ulong clientId

The client RTT to get
Returns
Type Description
ulong

The RTT
Overrides

GetLocalEndpoint()

Gets the local sytem's Unity.Networking.Transport.NetworkEndpoint that is assigned for the current network session.

Declaration
public NetworkEndpoint GetLocalEndpoint()
Returns
Type Description
NetworkEndpoint

Unity.Networking.Transport.NetworkEndpoint
Remarks

If the driver is not created it will return an invalid Unity.Networking.Transport.NetworkEndpoint.

GetNetworkDriver()

Gets a reference to the Unity.Networking.Transport.NetworkDriver.

Declaration
public ref NetworkDriver GetNetworkDriver()
Returns
Type Description
NetworkDriver

ref Unity.Networking.Transport.NetworkDriver

Initialize(NetworkManager)

Initializes the transport

Declaration
public override void Initialize(NetworkManager networkManager = null)
Parameters
Type Name Description
NetworkManager networkManager

The NetworkManager that initialized and owns the transport
Overrides

OnCurrentTopology()

Declaration
protected override NetworkTopologyTypes OnCurrentTopology()
Returns
Type Description
NetworkTopologyTypes
Overrides

PollEvent(out ulong, out ArraySegment<byte>, out float)

Polls for incoming events, with an extra output parameter to report the precise time the event was received.

Declaration
public override NetworkEvent PollEvent(out ulong clientId, out ArraySegment<byte> payload, out float receiveTime)
Parameters
Type Name Description
ulong clientId

The clientId this event is for
ArraySegment<byte> payload

The incoming data payload
float receiveTime

The time the event was received, as reported by m_RealTimeProvider.RealTimeSinceStartup.
Returns
Type Description
NetworkEvent

Returns the event type
Overrides

Send(ulong, ArraySegment<byte>, NetworkDelivery)

Send a payload to the specified clientId, data and networkDelivery.

Declaration
public override void Send(ulong clientId, ArraySegment<byte> payload, NetworkDelivery networkDelivery)
Parameters
Type Name Description
ulong clientId

The clientId to send to
ArraySegment<byte> payload

The data to send
NetworkDelivery networkDelivery

The delivery type (QoS) to send data with
Overrides

SetClientRelayData(string, ushort, byte[], byte[], byte[], byte[], bool)

Set the relay server data for the host.

Declaration
public void SetClientRelayData(string ipAddress, ushort port, byte[] allocationId, byte[] key, byte[] connectionData, byte[] hostConnectionData, bool isSecure = false)
Parameters
Type Name Description
string ipAddress

IP address or hostname of the relay server.
ushort port

UDP port of the relay server.
byte[] allocationId

Allocation ID as a byte array.
byte[] key

Allocation key as a byte array.
byte[] connectionData

Connection data as a byte array.
byte[] hostConnectionData

Host's connection data as a byte array.
bool isSecure

Whether the connection is secure (uses DTLS).

SetClientSecrets(string, string)

Set the client parameters for encryption.

Declaration
public void SetClientSecrets(string serverCommonName, string caCertificate = null)
Parameters
Type Name Description
string serverCommonName

Common name of the server (typically hostname).
string caCertificate

CA certificate used to validate the server's authenticity.
Remarks

If the CA certificate is not provided, validation will be done against the OS/browser certificate store. This is what you'd want if using certificates from a known provider. For self-signed certificates, the CA certificate needs to be provided.

The CA certificate (if provided) is expected to be in the PEM format, including the begin/end markers like -----BEGIN CERTIFICATE-----.

SetConnectionData(string, ushort, string)

Sets IP and Port information. This will be ignored if using the Unity Relay and you should call SetRelayServerData(string, ushort, byte[], byte[], byte[], byte[], bool)

Declaration
public void SetConnectionData(string ipv4Address, ushort port, string listenAddress = null)
Parameters
Type Name Description
string ipv4Address

The remote IP address (despite the name, can be an IPv6 address)
ushort port

The remote port
string listenAddress

The local listen address

SetConnectionData(NetworkEndpoint, NetworkEndpoint)

Sets IP and Port information. This will be ignored if using the Unity Relay and you should call SetRelayServerData(string, ushort, byte[], byte[], byte[], byte[], bool)

Declaration
public void SetConnectionData(NetworkEndpoint endPoint, NetworkEndpoint listenEndPoint = default)
Parameters
Type Name Description
NetworkEndpoint endPoint

The remote end point
NetworkEndpoint listenEndPoint

The local listen endpoint

SetDebugSimulatorParameters(int, int, int)

Set the parameters for the debug simulator.

Declaration
[Obsolete("SetDebugSimulatorParameters is no longer supported and has no effect. Use Network Simulator from the Multiplayer Tools package.", false)]
public void SetDebugSimulatorParameters(int packetDelay, int packetJitter, int dropRate)
Parameters
Type Name Description
int packetDelay

Packet delay in milliseconds.
int packetJitter

Packet jitter in milliseconds.
int dropRate

Packet drop percentage.

SetHostRelayData(string, ushort, byte[], byte[], byte[], bool)

Set the relay server data for the host.

Declaration
public void SetHostRelayData(string ipAddress, ushort port, byte[] allocationId, byte[] key, byte[] connectionData, bool isSecure = false)
Parameters
Type Name Description
string ipAddress

IP address or hostname of the relay server.
ushort port

UDP port of the relay server.
byte[] allocationId

Allocation ID as a byte array.
byte[] key

Allocation key as a byte array.
byte[] connectionData

Connection data as a byte array.
bool isSecure

Whether the connection is secure (uses DTLS).

SetRelayServerData(string, ushort, byte[], byte[], byte[], byte[], bool)

Set the relay server data for the server.

Declaration
public void SetRelayServerData(string ipv4Address, ushort port, byte[] allocationIdBytes, byte[] keyBytes, byte[] connectionDataBytes, byte[] hostConnectionDataBytes = null, bool isSecure = false)
Parameters
Type Name Description
string ipv4Address

IP address or hostname of the relay server.
ushort port

UDP port of the relay server.
byte[] allocationIdBytes

Allocation ID as a byte array.
byte[] keyBytes

Allocation key as a byte array.
byte[] connectionDataBytes

Connection data as a byte array.
byte[] hostConnectionDataBytes

The HostConnectionData as a byte array.
bool isSecure

Whether the connection is secure (uses DTLS).

SetRelayServerData(RelayServerData)

Set the relay server data (using the lower-level Unity Transport data structure).

Declaration
public void SetRelayServerData(RelayServerData serverData)
Parameters
Type Name Description
RelayServerData serverData

Data for the Relay server to use.

SetServerSecrets(string, string)

Set the server parameters for encryption.

Declaration
public void SetServerSecrets(string serverCertificate, string serverPrivateKey)
Parameters
Type Name Description
string serverCertificate

Public certificate for the server (PEM format).
string serverPrivateKey

Private key for the server (PEM format).
Remarks

The public certificate and private key are expected to be in the PEM format, including the begin/end markers like -----BEGIN CERTIFICATE-----.

Shutdown()

Shuts down the transport

Declaration
public override void Shutdown()
Overrides

StartClient()

Connects client to the server Note: When this method returns false it could mean:

  • You are trying to start a client that is already started
  • It failed during the initial port binding when attempting to begin to connect
Declaration
public override bool StartClient()
Returns
Type Description
bool

true if the client was started and false if it failed to start the client
Overrides

StartServer()

Starts to listening for incoming clients Note: When this method returns false it could mean:

  • You are trying to start a client that is already started
  • It failed during the initial port binding when attempting to begin to connect
Declaration
public override bool StartServer()
Returns
Type Description
bool

true if the server was started and false if it failed to start the server
Overrides

Implements