ugly.rs

    pub fn handler(&self, req: CoAPRequest) -> Option<CoAPResponse> {
        match req.get_option(CoAPOption::UriPath) {
            Some(req_path) => {
                match req.get_class() {
                    MessageClass::RequestType(rq_type) => {
                        match self.map.get(&rq_type) {
                            Some(dispatch) => {
                                dispatch.get(&req_path)
                            },
                            None => None,
                        }
                    },
                    _ => None,
                }
            },
            None => None
        }
    }