Function addMessage

examples/with-mqtt-js/app/page.tsx:9–11

(message: any)

export default function Home() {
  const [incomingMessages, setIncomingMessages] = useState<any[]>([]);
  const addMessage = (message: any) => {
    setIncomingMessages((incomingMessages) => [...incomingMessages, message]);
  };
  const clearMessages = () => {
    setIncomingMessages(() => []);
  };