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I'm using Apple's SamplePing to ping an IPAddress of my router local IPAddress. When I gave the existing local IPAddress, the SamplePing was sending the packet to the host and receiving the response packet. But when I hit the non existing IP in my local router it sends the package and does not receive any response. How can I find out whether it has failed or not and how can I find out whether that IP exists at all?

Here is my sample code:

let hostName = "192.168.1.31"// existing ip in my router
//"192.168.1.32"// non existing ip in my router

var pinger: SimplePing?
var sendTimer: Timer?

override func viewDidLoad() 
 super.viewDidLoad()
 self.title = self.hostName


 let pinger = SimplePing(hostName: self.hostName)
 self.pinger = pinger

 pinger.delegate = self
 pinger.start() 


func simplePing(_ pinger: SimplePing, didStartWithAddress address: Data) 
 self.pinger!.send(with: nil)


func simplePing(_ pinger: SimplePing, didFailWithError error: Error) 
 // NSLog("failed: %@", MainViewController.shortErrorFromError(error: error))
 print(error.localizedDescription)
 pinger.stop()


func simplePing(_ pinger: SimplePing, didSendPacket packet: Data, sequenceNumber: UInt16) 
 NSLog("#%u sent", sequenceNumber)


private func simplePing(pinger: SimplePing, didFailToSendPacket packet: NSData, sequenceNumber: UInt16, error: NSError) 
 print(error.localizedDescription)


func simplePing(_ pinger: SimplePing, didReceivePingResponsePacket packet: Data, sequenceNumber: UInt16) 
 NSLog("#%u received, size=%zu", sequenceNumber, packet.count)
 pinger.stop()


func simplePing(_ pinger: SimplePing, didReceiveUnexpectedPacket packet: Data) 
 NSLog("unexpected packet, size=%zu", packet.count)

This is the response for the success case:

2018-11-15 18:33:38.159301+0530 SimplePingApp[16332:534091] #0 sent
2018-11-15 18:33:38.567979+0530 SimplePingApp[16332:534091] #0 received, size=64
2018-11-15 18:33:38.568277+0530 SimplePingApp[16332:534091] stop

This is the Response for the failed case:

2018-11-15 18:33:38.159301+0530 SimplePingApp[16332:534091] #0 sent