Differing from the protocol described by @freehuntx, I send the shorttext to the error code as a second argument.
| EC | Description |
|---|---|
| ARG_ERR | Argument error, see sent shorttext for details |
| UNKNOWN_TYPE | Ypu sent an unknown packet type. Each packet starts with the packet type followed by a |. See the protocol for more details. |
| ALREADY_JOINED | You already joined the game |
| NOT_JOINED | You have not joined the game yet |
| AUTH_ERR | Authentication error; invalid username or password. Please be aware that the password is case-sensitive, cannot contain any spaces and cannot be changed. |
| NOT_IMPLEMENTED | The requested feature is not implemented (yet). Implement it and open a pull request to receive a honorable mention in the readme and MOTD. |