Check if delegate method was called - ios

Question

I have following function for connecting to a TCP Socket (Server on a Raspberry Pi, which I directly connect to via Access Point)
func connect (host: String, port: Int) {
Stream.getStreamsToHost(withName: addr, port: port, inputStream: &inputStream, outputStream: &outputStream)
if outputStream != nil && inputStream != nil {
outputStream!.delegate = self
inputStream!.delegate = self
outputStream!.schedule(in: .main, forMode: RunLoopMode.defaultRunLoopMode)
inputStream!.schedule(in: .main, forMode: RunLoopMode.defaultRunLoopMode)
outputStream!.open()
inputStream!.open()
}
}
When I'm connected to the Wifi-Hotspot of the Raspberry Pi following delegate method gets called and I can start writing data:
func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
if aStream === inputStream {
switch eventCode {
case Stream.Event.errorOccurred:
print("input: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
self.Label.text = "Disconnected"
case Stream.Event.openCompleted:
print("input: OpenCompleted")
case Stream.Event.hasBytesAvailable:
print("input: HasBytesAvailable")
// Here you can `read()` from `inputStream`
default:
break
}
}
else if aStream === outputStream {
switch eventCode {
case Stream.Event.errorOccurred:
print("output: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
self.Label.text = "Disconnected"
case Stream.Event.openCompleted:
print("output: OpenCompleted")
case Stream.Event.hasSpaceAvailable:
// print("output: HasSpaceAvailable")
// Here you can write() to `outputStream`
self.write(f: l)
self.write(f: r)
default:
break
}
}
}
But when I'm connected to another WiFi this method doesn't get called.
How can I detect that this method didn't get called, so I can alert the user that he isn't connected and that he should try connecting again?