Callbacks from background service to mini program

[adicu-mwb]

Hello. I implemented a mini program and a background service. When I update the settings in the mini program, I am able to send events from the mini program to the background service with emitCustomSystemEvent. However, while the mini app is open, I would like to be able to send some status data from the background service back to the mini program. I tried with the included EventBus and also with other implementations, I tried singleton, static, etc. It looks like a mini program and a background service can't exchange data with any of the mechanism I tried.

I do not want to trigger a notification. I just want to send back from the background service to the UI (when it is open only) a status message. Is this even possible? Thank you.

[silver-zepp]

Create an instance of LocalStorage in app.js. Then use it as a global object in device/bg context.

// app.js
import { LocalStorage } from "@zos/storage";

App({ 
  globals: { storage: new LocalStorage() },
  onCreate() {}, 
  onDestroy() {} 
})

// device/bg
const storage = getApp().globals.storage;

[adicu-mwb]

This was really helpful. I forgot about the global app object as described in https://docs.zepp.com/docs/guides/best-practice/cross-page-communications/

I added the EventBus in the global app object and now I can emit events from the service back to the UI:

import { EventBus } from '@zos/utils';

App({
  globalData: { eventBus: new EventBus() },
  onCreate(options) {
    console.log("app on create invoke");
  },

  onDestroy(options) {
    console.log("app on destroy invoke");
  },
});

Thank you for your hint.