# OpcTransport Class

<span class="api-meta">since v2.6</span>

<dl class="api-definition">
<dt>Namespace</dt>
<dd><a href="../namespaces/opc.uafx">Opc.UaFx</a></dd>
<dt>Assembly</dt>
<dd>Opc.UaFx.Advanced.dll</dd>
<dt>Package</dt>
<dd>Opc.UaFx.Advanced v2.59.0</dd>
<dt>Members</dt>
<dd><a href="./members">OpcTransport Members</a></dd>
<dt>Also in</dt>
<dd>Opc.UaFx.Client</dd>
</dl>

Provides transport options used by an application instance to control the behavior of the operation, communication and data flow between the opponent applications.

## Syntax

<div class="api-signature" data-lang="csharp">

```csharp
public class OpcTransport
```

</div>

<div class="api-signature" data-lang="vbnet">

```vbnet
Public Class OpcTransport
```

</div>

## Inheritance

[Object](https://learn.microsoft.com/dotnet/api/system.object) → **OpcTransport**

## Fields

| Name | Description |
|---|---|
| [DefaultChannelLifetime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultchannellifetime) | The default lifetime of a secure channel in milliseconds (10 minutes). |
| [DefaultMaxArrayLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultmaxarraylength) | The default maximum length of an array encoded in a message body (64 KB). |
| [DefaultMaxBufferSize](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultmaxbuffersize) | The default maximum size of the buffer to use when sending messages (64 KB). |
| [DefaultMaxByteStringLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultmaxbytestringlength) | The default maximum length of a byte string encoded in a message body (5 MB). |
| [DefaultMaxMessageSize](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultmaxmessagesize) | The default maximum length of a message body in bytes (10 MB). |
| [DefaultMaxStringLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultmaxstringlength) | The default maximum length of string encoded in a message body (64 KB). |
| [DefaultOperationTimeout](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultoperationtimeout) | The default timeout to use when sending requests in milliseconds (2 minutes). |
| [DefaultSecurityTokenLifetime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#defaultsecuritytokenlifetime) | The default lifetime of a security token in milliseconds (60 minutes). |

## Properties

| Name | Description |
|---|---|
| [ChannelLifetime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#channellifetime) | Gets or sets the lifetime of a secure channel in milliseconds. |
| [MaxArrayLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#maxarraylength) | Gets or sets the maximum length of an array encoded in a message body. |
| [MaxBufferSize](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#maxbuffersize) | Gets or sets the maximum size of the buffer to use when sending messages. |
| [MaxByteStringLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#maxbytestringlength) | Gets or sets the maximum length of a byte string encoded in a message body. |
| [MaxMessageSize](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#maxmessagesize) | Gets or sets the maximum length of a message body in bytes. |
| [MaxStringLength](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#maxstringlength) | Gets or sets the maximum length of string encoded in a message body. |
| [OperationTimeout](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#operationtimeout) | Gets or sets the default timeout to use when sending requests in milliseconds. |
| [SecurityTokenLifetime](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#securitytokenlifetime) | Gets or sets the lifetime of a security token in milliseconds. |

## Methods

| Name | Description |
|---|---|
| [Reset](https://www.traeger.de/en/docs/development/opcua/api/v2.59/opc.uafx.opctransport/members#reset) | Restores the default values used for the transport setup. |

## Applies to

| Package | Versions |
|---|---|
| Opc.UaFx.Advanced | v2.6–v2.59 |