Accessibility Service - Hardware KeyPress

Question

Is it possible to send past command so that it pastes text into currently focused edit text, I am using RFID reader Hardware. Scenario:

1. Background service listening for notification (done)
2. When notification is received text needs to be copied to clipboard (done)
3. Paste text to any currently focused field (done)

4. On Hardware RFID reader button trigger, I am getting source as null

   @Override public void onAccessibilityEvent(AccessibilityEvent event) { Log.e("-onAccessibilityEvent-", "----------");

   AccessibilityNodeInfo source2 = event.getSource();
   if (source2 == null) {
       return;
   }
   
   //    if (source2 != null && event.getEventType() == AccessibilityEvent.TYPE_VIEW_CLICKED) {
   
       ClipboardManager clipboard = (ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
       ClipData clip = ClipData.newPlainText("label", r);
       clipboard.setPrimaryClip(clip);
       source2.performAction(AccessibilityNodeInfo.ACTION_PASTE);
   }
   

   }

I know how to copy text with ClipboardManager.