How to disable dimming on the screen, and print os_log on the content screen

I have created an iOS .ipa file to run some tests, and all the test cases have os_log implemented for tracing. However, there is an issue; my tests take over 20 seconds to run, and the screen starts to dim. Consequently, the execution stops. Once I reactivate the screen, the tests resume. I added [UIApplication.sharedApplication setIdleTimerDisabled:YES]; to the code, but it doesn't resolve the problem.

I've used os_log to trace all the test case results. I wonder if it's possible to display all the os_log messages from runTest on the app main screen as well.

int main(int argc, char** argv) {
	
    //Separate thread to runTest, os_log implemented there
	std::thread thread_obj(runTests, argc, argv);

	int applicationReturn;
	@autoreleasepool {
         [UIApplication.sharedApplication setIdleTimerDisabled:YES];
         applicationReturn = UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
	}

    thread_obj.join();
    [UIApplication.sharedApplication setIdleTimerDisabled:NO];
    return applicationReturn;
}