Which is the beast way to use BehaviorSubject with Ionic4?

Hi,
I’m using some BehaviorSubject in an Ionic4 app.

I’ve defined them in a service:

@Injectable({
  providedIn: 'root'
})
export class DeviceManager {
	public deviceSpeed: BehaviorSubject<number>;
	...
}

And I’m using them in some pages in this way:

ngOnInit() {
    this.devicesManager.deviceSpeed.subscribe((value) => {
		// do things
      }
}

I have some doubts:

• Is ngOnInit the right method in which subscribe the BehaviorSubject?
• Is unsubscribe mandatory?
• In which method should I unsubscribe the BehaviorSubject?

Thank you very much

cld

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