ORSSerialPort doesn't send data - macos

Question

I am junior Swift user but on this stage of life I need use serial connection in my project.
when I looking for availeble port ,I see them without problem but when try to send something I have problem why?
I have problem with ORSSerial this my code:
func applicationDidFinishLaunching(_ aNotification: Notification) {
let portEvString = ORSSerialPortManager.shared().availablePorts
let pathString = portEvString[0].path
let portClass = SerialController(path:pathString)
portClass.open()
portClass.SendString(data: "hello")
// Insert code here to initialize your application
RunLoop.current.run()
}
class SerialController : NSObject, ORSSerialPortDelegate {
var port : ORSSerialPort?
init(path: String){
port = ORSSerialPort(path: path)
port?.close()
}
func open(){
port?.baudRate=9600
port?.delegate=self
port?.open()
}
func close(){
port?.delegate=nil
port?.close()
}
func SendString(data: String){
let dataa = Data(data.utf8)
port?.send(dataa)
}
func serialPortWasOpened(serialPort: ORSSerialPort!) {
print("PORT IS OPEN....")
}
func serialPortWasClosed(serialPort: ORSSerialPort!) {
print("PORT IS CLOSE")
}
func serialPort(serialPort: ORSSerialPort!, didReceiveData data: NSData!) {
print(NSString(data: data as Data, encoding: String.Encoding.utf8.rawValue))
}
func serialPortWasRemovedFromSystem(_ serialPort: ORSSerialPort!) {
print("PORT REMOVED")
}
func serialPort(serialPort: ORSSerialPort!, didEncounterError error: NSError!) {
print("PORT ERR \(error)")
}
}

Answer 1

I believe the primary problem is that you don't store the instance of SerialController in a strong reference, so it gets deallocated immediately after you call SendString() on it. You need to store it in a property like so:
var serialController: SerialController?
func applicationDidFinishLaunching(_ aNotification: Notification) {
let availablePorts = ORSSerialPortManager.shared().availablePorts
let pathString = availablePorts[0].path
serialController = SerialController(path:pathString)
serialController?.open()
serialController?.SendString(data: "hello")
}
Beyond that problem, there are a number of things about this code that you should fix. The things that stick out most:
Don't call RunLoop.current.run() in applicationDidFinishLaunching(_:). You rarely need to manually run the run loop, and you definitely don't need to here.
As documented in ORSSerialPort, you must release any strong references to the port in your implementation of serialPortWasRemovedFromSystem(_:). That means in that method, you need to do port = nil.
The force unwrap operators (!) scattered through this code make me wonder if you're using an old version of ORSSerialPort, from before I added nullability annotations. Please make sure you're using the latest version (2.0.2 as of this writing).
Use more descriptive names for your variables. For example, portEvString is not a good name, because it's difficult to understand (what does "Ev" mean?), and its type is not a string, it's an array of ORSSerialPort objects (ie. [ORSSerialPort].
Your SendString method shouldn't start with a capital letter. Function (and method) names in Swift should always start with a lowercase letter.

Answer 2

After the disable SandBox, everything is OK.