Update/refresh is unreliable on Marshmallow and newer due to App Doze

[fobroth]

I have to open the app to get current info. Would it also be possible to dismiss expired alerts on the widget?

[justdave]

The widget should automatically update any time the available alerts change. What version of Android are you on?

[fobroth]

On December 16, 2016 1:31:05 AM CST, Dave Miller ***@***.***> wrote: The widget should automatically update any time the available alerts change. What version of Android are you on? -- You are receiving this because you authored the thread. Reply to this email directly or view it on GitHub: #26 (comment)

Andriod ver 6.0.1 Doesn't seem to matter whether on wifi or cell, if that might mean anything. It has updated on its own before but most often I have to do it manually thru the app. While I have your attention, thank-you for making the app/ widget.

[justdave]

Are you using a custom home screen app (like Apex or similar)? What model phone is it?

The only thing I can think of that might cause this is if something is causing the background service to get killed. The OS in theory should be restarting it after 30 minutes if it does get killed though (although in my experience it usually restarts it almost immediately).

[justdave]

The other thing I should ask: how long are you waiting to see if it updates? Right now it polls the NWS server every 5 minutes. If an alert expires or a new one shows up right after it checks, it wouldn't get picked up until it checks again 5 minutes later. Polling more frequently than that runs a risk of getting your IP address blacklisted by the NWS. They supposedly have push notifications available now, but I've been having trouble finding documentation for it.

One thing I can do, in the case of expired alerts, is to automatically remove them when their expiration time passes, whether we've polled again yet or not. I don't do that yet, but it's on the to-do list.

[fobroth]

It's a samsung edge with no 3rd party app launchers. (Just samsung's stock goofy version)
I noticed the problem when the nws was issuing alerts for the last big winter weather last month. I live in midwest. I would see from another source that nws would add/modify alerts but the widget had stale info until I actuall opened the app, then the info got updated.
There's only been one (that I know of) alert since and that was from the widget.
Let me know if there's something I can do here to help because I do like having weather info available.

[fobroth]

And it was hours for old vs new data.

[fobroth]

Sorry to bombard you but for giggles I just opened the app and there's a fog advisory issued almost 8 hours ago that wasn't displayed in the widget.

[justdave]

Do you have access to USB Debugging by any chance? If so, getting some logs might be useful.

[fobroth]

Got prepared to do that but thanks to the wife's %#$* cat, I don't have a suitable usb cable. I don't have root on the phone, so, unless you can point me in another direction (I'm no developer or coder), I'm stuck until I find a cable. So sorry if this is a hassle for you. I can update you as my situation changes.

[fobroth]

I hope this helps- widget.txt is nws and widget1 is NWS. grepped from logcat
widget1.txt
widget.txt

[justdave]

The only important thing I see in there is:
01-03 18:24:03.195 16350 16362 I NWSBackgroundService: Timer task fetching https://alerts.weather.gov/cap/wwaatmget.php?x=IAC045&y=0
01-03 18:24:03.595 16350 16362 I NWSBackgroundService: Newly downloaded data hasn't changed since last time we grabbed it, ignoring.
Which basically tells me it's not updating because it thinks nothing new has been posted on the NWS site.

This is the right log to get the debug data out of to track this down, we're just going to have to catch it in the act to find out what's going on (i.e. keep it recording to a file and then go look at what shows up in the file if you catch it not updating.

I would probably grep -v LauncherAppWidgetHostView on your logcat though, since that's not really relevant and using a lot of space :)

[fobroth]

I was hoping you would say that it was the timer task not logging every 5 minutes.
I get the feeling you suspect network problems. Is there something else to look for that would tattle on network problems? Is polling a standard 'system' function or does everyone do it differently? Can I snoop on other things to see if polling fails when the phone is idle?
As I mentioned before, I'm not any kind of developer or coder, so I included everthing in the log snips, just in case. I can see that the words are in english, that's about all I get out of it :/
I'll prune that crap out for next time.
So, will it help to grab the log just anytime or during possible nws alerts? Thanks for being patient.

[justdave]

Oh, shame on me for not noticing the timestamps. Indeed, there are 4 ocurrences of the timer task running in the log, the last 3 are 5 minutes apart from each other like they should be, but the first 2 have 45 minutes between them. So there is certainly something happening that's keeping the timer task from firing. Was the phone stationary at the time? (laying on a desk, etc) If so, see https://developer.android.com/training/monitoring-device-state/doze-standby.html

Since the app doesn't do notifications yet, I haven't seen the need to work around that, since in theory as soon as you pick up the phone, Doze would release and it would update.

[fobroth]

Well, that sounds like nothing but trouble. But I guess I see the point, if only it worked more gracefully. I can monkey around with adb again tomorrow using the instructions your link gave to force doze and see what happens in the log if you want. Google ought to allow devs to make doze whitelisting a user option for apps like yours. I hope we're onto something.
And, yes, my phone does alot of laying around, therefore, dozing.

[fobroth]

FWIW- I found a 'hidden' (because I find the 'more' button less than intuitive) bunch of power saving options that toggles 'battery optimization' for apps. Last night, I turned this off for some apps that are supposed to do polling and this morn, I opened my phone to see that everything was current. This doze culprit makes sense because previously, it seemed that alot would happen when I woke my phone and it would take a while for it to catch-up. This leads me (the dumb user) to believe that apps aren't dealing well with doze. For now, I'm happy with the workaround.
I'd dismissed a bunch of (probably great) weather widgets as bull$#!^ because they didn't stay current and I was unaware that I could toggle their problem. This is the only alert widget I'd come across and am relieved to think that it's going to work, now. Thank-you!