BGTaskScheduler not working on Device keeping in background mode.

App & System Services Core OS
akshaykgupta OP
Created Feb ’21
Replies 3
Boosts 0
Views 2.3k
Participants 4
I have a simple app. I have created a BGTaskScheduler to schedule a task that will call a function. When I simulate the task using XCode and lldb, with app in background, the app works as it should. However the device itself never schedules the task. I have tried this for whole day now.

Info.plist file is correct, thats why the lldb is able to run it with just my task id.

Kindly Suggest
Replies  3
Boosts  0
Views  2.3k
Participants  4
f3r OP
Feb ’21
I am also very interested in this answer. Any one can help? Thanks in advance.
0
jayesh-elamgodil OP
Feb ’21
I am facing similar issues. I am able to trigger the tasks using XCode and LLDB but it does not work otherwise. Moreover, I found some interesting logs in the Console.

Approach 1:
On app launch, register the task and immediately submit a refresh request task.

Steps: Launch app, browse, kill app. Checks logs, notice how iOS is immediately cancelling the submitted task:

Code Block default	13:18:34.259422-0800	AppName	[skadnetwork]
default	13:18:34.261396-0800	AppName	submitTaskRequest: <BGAppRefreshTaskRequest: com.package.SKAdNetwork.updateConversion.taskIdentifier, earliestBeginDate: 2021-02-12 21:21:34 +0000>
default	13:18:34.261917-0800	AppName	Submitting task request activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:8AB717
default	13:18:34.266513-0800	AppName	[skadnetwork]
default	13:18:34.285296-0800	dasd	Submitted Activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:8AB717 at priority 10 <private>
error	13:18:34.300504-0800	appstored	Error setting install attribution pingback registered for app: 0, error: (null), result: 0
default	13:22:45.563043-0800	AppName	[skadnetwork] recordNewRelicBreadcrumb registerAppForAdNetworkAttribution
default	13:22:45.567397-0800	AppName	submitTaskRequest: <BGAppRefreshTaskRequest: com.package.SKAdNetwork.updateConversion.taskIdentifier, earliestBeginDate: 2021-02-12 21:25:45 +0000>
default	13:22:45.579130-0800	AppName	[skadnetwork] recordNewRelicBreadcrumb skAdNetwork_task_scheduled
default	13:22:45.610995-0800	dasd	Daemon Canceling Activities: {(
    bgRefresh-com.doordash.dd.SKAdNetwork.updateConversion.taskIdentifier:8AB717
)}
default	13:22:45.611545-0800	dasd	CANCELED: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:8AB717 at priority 10 <private>!



Approach 2:
On app launch, register the task. Submit request task when app enters background.
Steps: Launch app, browse, kill background, observe logs. The task never gets submitted and hence never runs 

Code Block default	14:41:36.614008-0800	appname	[skadnetwork] recordNewRelicBreadcrumb registerAppForAdNetworkAttribution
error	14:41:36.656615-0800	appstored	Error setting install attribution pingback registered for app: 0, error: (null), result: 0
default	14:41:49.107182-0800	appname	[skadnetwork] recordNewRelicBreadcrumb handleDidEnterBackground
default	14:41:49.107531-0800	appname	submitTaskRequest: <BGAppRefreshTaskRequest: com.package.SKAdNetwork.updateConversion.taskIdentifier, earliestBeginDate: 2021-02-12 22:46:49 +0000>
default	14:41:49.108325-0800	appname	Submitting task request activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:CF77A7
default	14:41:49.113179-0800	appname	[skadnetwork] recordNewRelicBreadcrumb skAdNetwork_task_scheduled



Approach 3:
On app launch, register the task. Submit request task when app enters background.
Steps: Launch app, browse, put the app in the background, observe logs, this works sometimes.

Code Block default	13:39:07.774533-0800	appname	[skadnetwork] recordNewRelicBreadcrumb registerAppForAdNetworkAttribution
default	13:39:07.786890-0800	appname	submitTaskRequest: <BGAppRefreshTaskRequest: com.package.SKAdNetwork.updateConversion.taskIdentifier, earliestBeginDate: 2021-02-12 21:44:07 +0000>
default	13:39:07.789282-0800	appname	Submitting task request activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E
default	13:39:07.793443-0800	appname	[skadnetwork] recordNewRelicBreadcrumb skAdNetwork_task_scheduled
default	13:39:07.817614-0800	dasd	Submitted Activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E at priority 10 <private>
error	13:39:07.833182-0800	appstored	Error setting install attribution pingback registered for app: 0, error: (null), result: 0
default	13:47:53.991482-0800	dasd	bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E:[
	{name: ApplicationPolicy, policyWeight: 50.000, response: {Decision: Can Proceed, Score: 0.46}}
	{name: DeviceActivityPolicy, policyWeight: 5.000, response: {Decision: Can Proceed, Score: 0.38}}
 ] sumScores:66.057196, denominator:96.410000, FinalDecision: Can Proceed FinalScore: 0.685170}
default	13:47:53.991704-0800	dasd	'bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E' CurrentScore: 0.685170, ThresholdScore: 0.439288 DecisionToRun:1
default	13:47:54.034203-0800	dasd	bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E:[
	{name: ApplicationPolicy, policyWeight: 50.000, response: {Decision: Can Proceed, Score: 0.46}}
	{name: DeviceActivityPolicy, policyWeight: 5.000, response: {Decision: Can Proceed, Score: 0.38}}
 ] sumScores:66.057196, denominator:96.410000, FinalDecision: Can Proceed FinalScore: 0.685170}
default	13:47:54.251142-0800	appname	Handling launch from daemon for activities: {(
    bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E
)}
default	13:47:54.251260-0800	appname	Application launched for activities: {(
    bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E
)}
default	13:47:54.251379-0800	appname	Calling handlers for activities: {(
    bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E
)}
default	13:47:54.251492-0800	appname	Running task: <BGAppRefreshTask: com.package.SKAdNetwork.updateConversion.taskIdentifier>
default	13:47:54.253333-0800	appname	Starting task: <BGAppRefreshTask: com.package.SKAdNetwork.updateConversion.taskIdentifier>
default	13:47:54.257241-0800	appname	[skadnetwork] recordNewRelicBreadcrumb skAdNetwork_task_invoked
default	13:47:54.346683-0800	appname	[skadnetwork] recordNewRelicBreadcrumb skAdNetwork_conv_updated
error	13:47:54.348164-0800	appstored	Error updating install attribution pingback for app: 0, error: (null), result: 0
default	13:47:54.460999-0800	appname	Complete task request activity: bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E
default	13:47:54.461765-0800	dasd	COMPLETED bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E at priority 10 <private>!
default	13:47:54.462502-0800	dasd	NO LONGER RUNNING bgRefresh-com.package.SKAdNetwork.updateConversion.taskIdentifier:23654E ...Tasks running in group [com.apple.dasd.defaultNetwork] are 0!





0
woosa OP
Feb ’21
I am also facing the same problem.
Please details for my issue here https://developer.apple.com/forums/thread/674640#674640021
0
BGTaskScheduler not working on Device keeping in background mode.
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