Five Min BG scheduling

I think this should work... in my onTimerStart() method once an Activity is started. I could put this in onStart() instead so it does this even before the Activity starts?

What I think this should do is fire off my BG process immediately if the last time didn't exist or is more than 5 mins ago.

Since that is a MOMENT, that is a one time trigger. Then go ahead and also setup an EVERY FIVE MINS Duration event, regardless of if I have started an immediate event or not.

Any timing issues with this logic?

//////////////////////////

var lastTime = Background.getLastTemporalEventTime();

var FIVEMINS = new Time.Duration(5 * 60);

if (lastTime == null || Time.now().greaterThan(lastTime.add(FIVEMINS))) {

System.println("Background Event triggered right now");

Background.registerForTemporalEvent(Time.now());

}

System.println("Background Event scheduled every 5 minutes");

Background.registerForTemporalEvent(FIVEMINS);

0 igorov over 1 year ago

I think you need to delete temporal event after first one time run (now) and then re-register it for every 5 minutes.

Something like this:

var firstTime=true;
function onBackgroundData(data) {
... do something with data returned
    if(firstTime){
        Background.deleteTemporalEvent();
        registerBgEvent();
        firstTime=false;
    }
}

0 flocsy🤠 over 1 year ago

I didn't understand what't the problem. Is it that after it runs immediately it doesn't run again 5 minutes later? Or that it doesn't run immediately even when the last time it ran was more than 5 minutes ago? If the latter then IMHO what happens is that you register it for now, then immediately you re-register it for 5 minutes from now, that's why it doesn't run immediately.

BTW not sure if it's critical but IMHO you can "improve" it by registering not for 5 mins from now, but to (5mins - (now - lastTime)) in case it ran less than 5 minutes ago.

0 jim_m_58 over 1 year ago

Don't do it in onStart() as that runs each time the background runs. What you can do is put it in getInitialView as that only runs for the main app.

What I typically do is always set a duration, so once started, it runs every X minutes for something like a widget or watch face, even if the main app is closed. I avoid doing anything in onBackgroundData with the temporal event, as if the main app isn't running at that point, the background may not run again.. That's bad if you have a widget that publishes complications or something that only gets the weather every X minutes, like a watch face.

Here's a thread from about 7 years back with a watch face with a backgound https://forums.garmin.com/developer/connect-iq/f/discussion/5287/very-simple-sample-of-a-watch-face-with-a-background-process

And a mewer one with a whole bunch of stuff in addition to a simple background: https://forums.garmin.com/developer/connect-iq/f/discussion/349473/simple-example-wf-that-shows-a-bunch-of-things

In both I just use a duration, and the backgound returns the time it ran, so it's easy to see if it's running when you expect.