better stopping

apps/pulsegen/main.py

@@ -5,6 +5,7 @@ import json
 import logging
 import os
 import signal
+import uuid
 from typing import Any
 
 from aiomqtt import Client, Message
@@ -163,7 +164,7 @@ async def mqtt_worker(shutdown_event: asyncio.Event) -> None:
             async with Client(
                 hostname=broker,
                 port=port,
-                identifier="pulsegen"
+                identifier=f"pulsegen-{uuid.uuid4()}",
             ) as client:
                 logger.info("Connected to MQTT broker")
                 
@@ -175,15 +176,20 @@ async def mqtt_worker(shutdown_event: asyncio.Event) -> None:
                 # Publish startup message
                 await publish_example(client)
                 
-                # Message loop
+                # Message loop with timeout to allow shutdown check
                 async for message in client.messages:
                     if shutdown_event.is_set():
+                        logger.info("Shutdown event detected, breaking message loop")
                         break
                     try:
                         await handle_message(message, client)
                     except Exception as e:
                         logger.error(f"Error in message handler: {e}", exc_info=True)
                 
+                # If we exit the loop due to shutdown, break the reconnect loop too
+                if shutdown_event.is_set():
+                    break
+                        
         except asyncio.CancelledError:
             logger.info("MQTT worker cancelled")
             break
@@ -216,8 +222,17 @@ async def main() -> None:
     # Wait for shutdown signal
     await shutdown_event.wait()
     
-    # Wait for worker to finish
+    # Give worker a moment to finish gracefully
+    logger.info("Waiting for MQTT worker to finish...")
+    try:
+        await asyncio.wait_for(worker_task, timeout=5.0)
+    except asyncio.TimeoutError:
+        logger.warning("MQTT worker did not finish in time, cancelling...")
+        worker_task.cancel()
+        try:
             await worker_task
+        except asyncio.CancelledError:
+            pass
     
     logger.info("Pulsegen application stopped")