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App crashed crashed on context.save() From the crash logs i found this log. -[NSPersistentStoreCoordinator _coordinator_you_never_successfully_opened_the_database_disk_full:] + 55 What does this mean? how can I gracefully handle this?

I've to perform several steps in loop. For each IP in the local subnet: Ping the IP. If not available (within a small/tuneable timeout eg. 200 ms), move on to next IP If the IP pings back, send a POST authentication request. Stop after an IP is authenticated succesfully. Finally save the IP in the database for future use. Now, I have no idea of how I can find the local subnet for an iOS device in the first place and secondly how can I ping an IP address(in Swift).