NWConnection timeout - ios

Question

this is my first post to the community, so please be patient ;-)
I am using Apples Network framework to build a TCP connection to a server. It locks like this:
let testConnection = NWConnection(host: NWEndpoint.Host(server!.serverAddress), port: NWEndpoint.Port(server!.serverPort)!, using: .tcp)
testConnection.stateUpdateHandler = ({ state in
print("TCP state change to: \(state)")
switch state {
case .setup:
break
case .waiting(let error):
print("Waiting Error \(error)")
testConnection.cancel()
break
case .preparing:
break
case .ready:
beginCommunication()
break
case .failed(let error):
print("\(error)")
break
case .cancelled:
break
default:
break
}
})
The serverAddress and serverPort is entered by the user. I want to test the connection. Now my problem is, that if the user is entering an invalid address / port combination (the service is not offered by the server). I stuck in the preparing state for quite a long time. After that I get to the waiting stage (with error message POSIXErrorCode: Operation timed out).
Is there any way to set the timeout for this first connection process ?
Thanks for your ideas

Answer 1

You can set connection timed out by NWProtocolTCP.Options
lazy var tcpOptions: NWProtocolTCP.Options = {
let options = NWProtocolTCP.Options()
options.connectionTimeout = 5 // connection timed out
return options
}()
lazy var parames: NWParameters = {
let parames = NWParameters(tls: nil, tcp: self.tcpOptions)
if let isOption = parames.defaultProtocolStack.internetProtocol as? NWProtocolIP.Options {
isOption.version = .v4
}
parames.preferNoProxies = true
return parames
}()
lazy var connection: NWConnection = {
let connection = NWConnection(host: "x.x.x.x", port: xxxx, using: self.parames)
return connection
}()
When trigger the timed out event, the .waiting state will call back.
2021-08-30 23:05:17.xxxxxx+xxxx Demo[xxxx:xxxxxx] [connection] nw_socket_handle_socket_event [C1:1] Socket SO_ERROR [60: Operation timed out]
The connection is waiting for a network path change with: POSIXErrorCode: Operation timed out
reference from Developer Fourms