Low-Level Networking on watchOS 7

Code Block 
class Connect: ObservableObject {
    static let sharedInstance = Connect()
    private var talking: NWConnection?
    private var listening: NWListener?
    @Published var incomingUDPMessage: String = ""
    func listenUDP(port: NWEndpoint.Port) {
        print("IP Address:")
        print(getIpAddress())
        do {
            self.listening = try NWListener(using: .tcp, on: port)
            print("listening params")
            print(self.listening?.service)
            self.listening?.stateUpdateHandler = {(newState) in
                switch newState {
                case .ready:
                print("ready to listen")
                default:
                break
                }
            }
            self.listening?.newConnectionHandler = {(newConnection) in
                newConnection.stateUpdateHandler = {newState in
                    switch newState {
                    case .ready:
                    print("new connection")
                    self.receive(on: newConnection)
                    default:
                    break
                    }
                }
                newConnection.start(queue: DispatchQueue(label:    "new client"))
                }
            } catch {
        print("unable to create listener")
        }
        self.listening?.start(queue: .main)
    }// END OF FUNC - LISTEN TO UDP
    func receive(on connection: NWConnection) {
        connection.receiveMessage { (data, context, isComplete, error) in
            if let error = error {
                print(error)
                return
            }
            if let data = data, !data.isEmpty {
                    let incomingString = String(decoding: data, as:     UTF8.self)
                    print("Incoming String")
                    print(incomingString)
                    self.listening?.cancel()
            }
        }
    }// END OF FUNC - RECEIVE
}// END OF CLASS - CONNECT