simulate series of mouse click macOS swift

Question

I am simulating mouse click with below code taken from here that works. But if I chain mouse click events it does not work after first tap is sent, although thread stays active.

code trying with:

  let position1 = CGPoint(x: 10, y: 100)
  let position = CGPoint(x: 80, y: 300)
  let eventDown = CGEvent(mouseEventSource: src, mouseType: .leftMouseDown, mouseCursorPosition: position1 , mouseButton: .left)
  let eventUp = CGEvent(mouseEventSource: src, mouseType: .leftMouseUp, mouseCursorPosition: position1 , mouseButton: .left)
  let eventDown1 = CGEvent(mouseEventSource: src, mouseType: .leftMouseDown, mouseCursorPosition: position1 , mouseButton: .left)
  let eventUp1 = CGEvent(mouseEventSource: src, mouseType: .leftMouseUp, mouseCursorPosition: position1 , mouseButton: .left)


   
                  eventDown?.post(tap: .cghidEventTap)
   //usleep(500_000)
                  eventUp?.post(tap: .cghidEventTap)
   
   //Then for another eventDown n eventUP posts. But that doesn't work
eventDown1?.post(tap: .cghidEventTap)
eventUp1?.post(tap: .cghidEventTap)

above code works for first event. If I post another event (eg: eventUp1 and eventDown1) that does not work.

How can this second tap work?

This is how I'm testing: I am testing with multiple windows of "TextEdit" app and another app like terminal on top of them placing carefully on exact screen coordinates, then checking if those textEdit windows comes forward.