Potential fix for code scanning alert no. 44: Clear-text logging of sensitive information

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: eman

examples/test_mqtt_messaging.py

@@ -117,10 +117,15 @@ def message_handler(topic: str, message: dict):
                 f"evt/{device_type}/{device_topic}/#",
             ]
 
+            def mask_mac_in_topic(topic, mac_addr):
+                if mac_addr and mac_addr in topic:
+                    return topic.replace(mac_addr, "[REDACTED_MAC]")
+                return topic
+
             for topic in topics:
                 try:
                     await mqtt_client.subscribe(topic, message_handler)
-                    print(f"   ✅ Subscribed to: {topic}")
+                    print(f"   ✅ Subscribed to: {mask_mac_in_topic(topic, device_id)}")
                 except Exception as e:
                     print(
                         f"   ⚠️ Failed to subscribe to device topic (type: {device_type}): {e}"