Macro define_protocol

macro_rules! define_protocol {
    ($version: literal, $packett: ident, $rawpackett: ident, $rawdt: ident, $kindt: ident => {
        $($nam: ident, $id: literal, $state: ident, $direction: ident => $body: ident {
            $($fnam: ident: $ftyp: ty),* }),*
        }
    ) => { ... };
}