Text chat developer guide

Learn how to implement text chat features in your Unreal project.

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Vivox provides a text chat service:

Text chat - channel-based and directed text chat.
- Chat messages can contain any language or content up to service-defined size and rate limits.
- Chat messages are transported over TLS. No chat messages are saved or archived.

The following additional features can be enabled:

Adaptive Chat filter
Chat history - Core SDK and Unity SDK v16 only.
Text evidence management
Edit and delete messages - Core SDK and Unity SDK v16 only.
Offline direct messages - Core SDK and Unity SDK v16 only.
Anti-flooding
Large text channel support
Retrieve conversations list - Core SDK and Unity SDK v16 only.
Set Chat Markers - Core SDK and Unity SDK v16 only.
Channel-specific options - Core SDK only.

The server can customize a maximum byte count for text messages in its pre-login configuration. By default, the maximum is 320 bytes with UTF-8 encoding. A text message that exceeds the maximum length in bytes is rejected with a VxErrorMessageTextTooLong error. Text chat requires a Unicode-supported system to work properly. The Unity Editor has full Unicode support in versions 2017.1 and later. The following table details text chat policy:

Service	Policy option	Default	Description
Standard text chat	rate_limit	1000 bytes per second	The maximum rate at which a player can send data over text chat. This is configured server-side by Vivox.

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