Call RESTful API while application in background state for indefinite time

Question

I want to call a post method every 60 seconds later while application is in background mode.My objective is to store user location and send it to my server.So far, for test purpose I have used beginBackgroundTaskWithExpirationHandler and NSTime for every 3 seconds call of a temporary post call and it's working fine. But problem is, this background task is being stopped after 10 times call. but I want it to call it indefinite times in certain interval(suppose every 60s or once in a day).

Application iOS Deployment target : 9.0 and its Objective C project with swift compatibility. So far I have done this:

- (void)applicationWillResignActive:(UIApplication *)application {

    self.backgroundUpdateTask = [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:^{
    [self endBackgroundUpdateTask];
    }];
}
- (void) endBackgroundUpdateTask
{
    [[UIApplication sharedApplication] endBackgroundTask: self.backgroundUpdateTask];
    self.backgroundUpdateTask = UIBackgroundTaskInvalid;
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
    [self endBackgroundUpdateTask];
}

- (void)applicationDidEnterBackground:(UIApplication *)application {

    [NSTimer scheduledTimerWithTimeInterval:3.0 repeats:YES block:^(NSTimer * _Nonnull timer) {
        [self targetMethod];
    }];
}

can anyone help me out how can I call this targetMethod in regular interval?

Thanks