fix creation of queue on dummy

reHDDPrinter.py

@@ -1,9 +1,9 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
-""" Author:                     Hendrik Schutter, localhorst@mosad.xyz
-    Date of creation:           2022/11/23
-    Date of last modification:  2025/06/15
+"""Author:                     Hendrik Schutter, localhorst@mosad.xyz
+Date of creation:           2022/11/23
+Date of last modification:  2025/06/15
 """
 
 import ctypes
@@ -119,6 +119,7 @@ def create_drive_objects(drive_info):
 def worker(queue_id, test_mode=False):
     try:
         while not terminate:
+            time.sleep(3)
             if test_mode:
                 drive_info = {
                     "driveIndex": "42",
@@ -167,7 +168,6 @@ def worker(queue_id, test_mode=False):
                     "driveSerialnumber": d.caDriveSerialnumber.decode().strip("\x00"),
                     "driveReHddVersion": d.caDriveReHddVersion.decode().strip("\x00"),
                 }
-                time.sleep(3) 
 
             print(f"Received Drive Data: {drive_info}")
 
@@ -204,9 +204,16 @@ def main():
         return
     while True:
         try:
-            queue_id = msgget(MSG_QUEUE_KEY, 0)
+            # Create or connect to the message queue with IPC_CREAT flag
+            # This matches the C++ sender's flags (IPC_CREAT | 0666)
+            queue_id = msgget(MSG_QUEUE_KEY, IPC_CREAT | 0o666)
             if queue_id == -1:
-                raise RuntimeError("Failed to connect to the existing message queue.")
+                err = ctypes.get_errno()
+                raise RuntimeError(
+                    f"Failed to create/connect to the message queue: {os.strerror(err)}"
+                )
+
+            print(f"Successfully connected to message queue (ID: {queue_id})")
             worker(queue_id)
         except Exception as e:
             print(f"Main process encountered an error: {e}")