Merge branch 'sync_fix' into 'master'

Increase FCM TTL

See merge request entgra/carbon-device-mgt!738

components/device-mgt-extensions/org.wso2.carbon.device.mgt.extensions.push.notification.provider.fcm/src/main/java/org/wso2/carbon/device/mgt/extensions/push/notification/provider/fcm/FCMNotificationStrategy.java

@@ -45,7 +45,7 @@ public class FCMNotificationStrategy implements NotificationStrategy {
     private static final String FCM_TOKEN = "FCM_TOKEN";
     private static final String FCM_ENDPOINT = "https://fcm.googleapis.com/fcm/send";
     private static final String FCM_API_KEY = "fcmAPIKey";
-    private static final int TIME_TO_LIVE = 5 * 60; //Set FCM TTL to 5 minutes
+    private static final int TIME_TO_LIVE = 2419199; // 1 second less that 28 days
     private static final int HTTP_STATUS_CODE_OK = 200;
     private final PushNotificationConfig config;