ddnet/src/engine/shared/protocol_ex_msgs.h

// UUID(name_in_code, name)
//
// When adding your own extended net messages, choose the name (third
// parameter) as `<name>@<domain>` where `<name>` is a name you can choose
// freely and `<domain>` is a domain you own. If you don't own a domain, try
// choosing a string that is not a domain and uniquely identifies you, e.g. use
// the name of the client/server you develop.
//
// Example:
//
// 1) `i-unfreeze-you@ddnet.tw`
// 2) `creeper@minetee`
//
// The first example applies if you own the `ddnet.tw` domain, that is, if you
// are adding this message on behalf of the DDNet team.
//
// The second example shows how you could add a message if you don't own a
// domain, but need a message for your minetee client/server.

UUID(NETMSG_WHATIS,       "what-is@ddnet.tw")
UUID(NETMSG_ITIS,         "it-is@ddnet.tw")
UUID(NETMSG_IDONTKNOW,    "i-dont-know@ddnet.tw")

UUID(NETMSG_RCONTYPE,    "rcon-type@ddnet.tw")