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# Velocity Integration (Cross-Server Chat) <Badge type="tip" text="v0.8.0" />
This feature enables cross-server chat between Paper servers connected through a Velocity proxy server.
::: warning Experimental Feature
This feature is currently provided as an experimental feature. Specifications may change in future updates.
:::
## Enabling Integration
To enable Velocity integration, follow these steps:
1. Install the Velocity version of LunaticChat on the Velocity side.
2. Open `plugins/LunaticChat/config.yml` on each Paper server and set `velocity.enabled` to `true`.
3. Start Velocity and Paper, and verify that the integration completion message appears.
## Plugin Version and Protocol Version
For Velocity and Paper's LunaticChat to integrate correctly, both plugin versions and protocol versions must be compatible.
- Ensure that the LunaticChat versions on Velocity and Paper sides are the same.
- Generally, the same version of LunaticChat is compatible.
- Releases are made simultaneously for Velocity and Paper versions, so version numbers will not differ.
- However, compatibility may not be guaranteed when using beta or development versions.
- Ensure that protocol versions match.
- LunaticChat uses protocol versions to ensure compatibility between different versions.
- Verify that the protocol versions of LunaticChat on Velocity and Paper sides match.
- Note that when protocol versions change, it is considered a **breaking change**, requiring simultaneous updates of both Velocity and Paper versions of LunaticChat.
::: danger Regarding LunaticChat versions prior to v0.7.0
LunaticChat versions prior to v0.7.0 are not backward compatible with the Velocity version.
They cannot be used together, so if you are using LunaticChat prior to v0.7.0, do not use the Velocity integration feature.
:::
::: tip Version Rules
LunaticChat follows these version rules:
- Plugin version: Exact match required
- Paper 0.7.0, Velocity 0.7.0 → ✓ PASS
- Paper 0.7.0, Velocity 0.6.0 → ✗ FAIL
- Protocol version: MAJOR.MINOR must match
- Paper 1.0.0, Velocity 1.0.1 → ✓ PASS (PATCH difference is OK)
- Paper 1.0.0, Velocity 1.1.0 → ✗ FAIL (MINOR difference)
- Paper 1.0.0, Velocity 2.0.0 → ✗ FAIL (MAJOR difference)
:::
## How to Check Integration Status
To verify that Velocity integration is working properly, use the `/lcv status` command.
The current protocol version and connection state will be displayed.
## Troubleshooting
If you encounter issues with Velocity integration, check the following:
- Ensure that the LunaticChat version / protocol version on Velocity and Paper sides are the same.
- Verify that LunaticChat settings are correct.
- Ensure that network connection between Velocity server and Paper servers is working properly.
- Check LunaticChat logs for error messages or warnings.
## Cross-Server Chat
When Velocity integration is enabled, chat messages are shared across all servers connected through the proxy server.
## Features Compatible with Velocity Integration
The main features available during Velocity integration are as follows:
| | Compatibility | Behavior | Notes |
|------------| --- | --- | --- |
| Direct Messages | ◯ | Can send DMs to players on other servers using `/tell` and `/reply` commands | |
| Channel Chat | × | Channel chat operates only within the server | Channel chat does not support Velocity integration. |
| Kana/Romanization | ◯ | Kana/Romanization works across all servers | |
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