How to use the node-dtls-client.dtls function in node-dtls-client

port: origin.port,
                }, CoapClient.dtlsParams.get(origin.hostname));
                // return a promise we resolve as soon as the connection is secured
                const ret = DeferredPromise_1.createDeferredPromise();
                // try connecting
                const onConnection = () => {
                    debug("successfully created socket for origin " + origin.toString());
                    sock.removeListener("error", onError);
                    ret.resolve(new SocketWrapper_1.SocketWrapper(sock));
                };
                const onError = (e) => {
                    debug("socket creation for origin " + origin.toString() + " failed: " + e);
                    sock.removeListener("connected", onConnection);
                    ret.reject(e.message);
                };
                const sock = node_dtls_client_1.dtls
                    .createSocket(dtlsOpts)
                    .once("connected", onConnection)
                    .once("error", onError);
                return ret;
            default:
                throw new Error(`protocol type "${origin.protocol}" is not supported`);
        }
    }
}

constructor(socket) {
        super();
        this.socket = socket;
        this.isDtls = (socket instanceof node_dtls_client_1.dtls.Socket);
        socket
            .on("message", (message, rinfo) => {
            this.emit("message", message, rinfo);
        })
            .on("error", (err) => {
            this.emit("error", err);
        })
            .on("close", () => {
            this.emit("close");
        });
    }
    send(msg, origin) {