update

Dockerfile

 RUN sed -i 's/index  index.html index.htm;/try_files $uri \/index.html;/' /etc/nginx/conf.d/default.conf
 
 COPY /dist/lot-web-ui /usr/share/nginx/html
+
+#FROM node:18-alpine
+#WORKDIR /app
+#COPY dist/ots-landing-page-ssr .
+#EXPOSE 80
+#CMD node server/server.mjs

src/app/modules/homepage/homepage/home-page.component.ts

         setTimeout(() => {
           this.mqtt$.sendPublish({ id: '0', type: 'get', arlamtime: ''});
         }, 1000);
-        this.mqtt$.messages$.pipe(takeUntil(this.unsubscribeAll)).subscribe((message: any) => {
+        this.mqtt$.messages$.pipe(takeUntil(this.unsubscribeAll), filter((item) => item !== null)).subscribe((message: any) => {
           if (message.id == '0' && message.whistletime) {
             this.whistle.time = Number(message.whistletime);
           }