Add the error if the producer could not connect to the server.

notification_producer/producer_client.py

@@ -36,8 +36,12 @@ class ProducerClient:
         self.writer = None
 
     async def connect(self):
+        try:
             self.reader, self.writer = await asyncio.open_connection(self.__ip, self.__port)
             self.console.print(f'[yellow b][INFO][/] Connected to the server ({self.__ip}:{self.__port}).')
+        except ConnectionRefusedError:
+            sys.stderr.write("Could not connect to the server. Please, check the ip and the port.\n")
+            sys.exit(1)
 
     async def send(self, message: str):
         self.writer.write(struct.pack('<L', len(message)))