fix: separate thread for proxy

ref: N25B-217

src/control_backend/main.py

@@ -3,6 +3,7 @@
 # External imports
 import contextlib
 import logging
+import threading
 
 import zmq
 from fastapi import FastAPI
@@ -23,12 +24,7 @@ from control_backend.core.config import settings
 logger = logging.getLogger(__name__)
 logging.basicConfig(level=logging.DEBUG)
 
-
+def setup_sockets():
-@contextlib.asynccontextmanager
-async def lifespan(app: FastAPI):
-    logger.info("%s starting up.", app.title)
-
-    # Initiate sockets
     context = Context.instance()
 
     internal_pub_socket = context.socket(zmq.XPUB)
@@ -38,8 +34,22 @@ async def lifespan(app: FastAPI):
     internal_sub_socket = context.socket(zmq.XSUB)
     internal_sub_socket.bind(settings.zmq_settings.internal_sub_address)
     logger.debug("Internal subscribing socket bound to %s", internal_sub_socket)
+    try:
+        zmq.proxy(internal_pub_socket, internal_sub_socket)
+    except zmq.ZMQError:
+        logger.warning("Error while handling PUB/SUB proxy. Closing sockets.")
+    finally:
+        internal_pub_socket.close()
+        internal_sub_socket.close()
 
-    zmq.proxy(internal_pub_socket, internal_sub_socket)
+@contextlib.asynccontextmanager
+async def lifespan(app: FastAPI):
+    logger.info("%s starting up.", app.title)
+
+    # Initiate sockets
+    proxy_thread = threading.Thread(target=setup_sockets)
+    proxy_thread.daemon = True
+    proxy_thread.start()
 
     # Initiate agents
     ri_communication_agent = RICommunicationAgent(