refactor: ZMQ context and proxy

Use ZMQ's global context instance and setup an XPUB/XSUB proxy intermediary to allow for easier multi-pubs.

close: N25B-217

src/control_backend/agents/ri_communication_agent.py

@@ -1,14 +1,13 @@
 import asyncio
-import json
 import logging
+
+import zmq
 from spade.agent import Agent
 from spade.behaviour import CyclicBehaviour
-import zmq
+from zmq.asyncio import Context
 
-from control_backend.core.config import settings
-from control_backend.core.zmq_context import context
-from control_backend.schemas.message import Message
 from control_backend.agents.ri_command_agent import RICommandAgent
+from control_backend.core.config import settings
 
 logger = logging.getLogger(__name__)
 
@@ -47,7 +46,7 @@ class RICommunicationAgent(Agent):
                 message = await asyncio.wait_for(self.agent.req_socket.recv_json(), timeout=3.0)
 
             # We didnt get a reply :(
-            except asyncio.TimeoutError as e:
+            except TimeoutError:
                 logger.info("No ping retrieved in 3 seconds, killing myself.")
                 self.kill()
 
@@ -75,7 +74,7 @@ class RICommunicationAgent(Agent):
         # Let's try a certain amount of times before failing connection
         while retries < max_retries:
             # Bind request socket
-            self.req_socket = context.socket(zmq.REQ)
+            self.req_socket = Context.instance().socket(zmq.REQ)
             if self._bind:
                 self.req_socket.bind(self._address)
             else:
@@ -88,7 +87,7 @@ class RICommunicationAgent(Agent):
             try:
                 received_message = await asyncio.wait_for(self.req_socket.recv_json(), timeout=20.0)
 
-            except asyncio.TimeoutError:
+            except TimeoutError:
                 logger.warning(
                     "No connection established in 20 seconds (attempt %d/%d)",
                     retries + 1,