[Bug] Can't use ROS Service with Zenoh namespace

[sabrinaacardoso]

Describe the bug

When a namespace is configured in the zenoh_config.json5 file under the ros2dds plugin, the service communication between my TurtleBot2i (acting as a client) and my Ubuntu computer (acting as a server) fails. Removing the namespace resolves the issue. But I need to use namespace in my application.

To reproduce

1. Zenoh Configuration on TurtleBot2i:

   {
       mode: "peer",
       connect: { endpoints: ["tcp/104.0.0.20:7447"] },
       plugins: {
           ros2dds: {
               id: "turtlebot",
               namespace: "/turtlebot",
               deny: {
                   publishers: [".*/rosout", ".*/.*parameter.*", ".*/_internal/.*"],
                   subscribers: [".*/rosout", ".*/.*parameter.*", ".*/_internal/.*"],
                   service_servers: [".*/.*parameter.*", ".*/_internal/.*"],
                   Service_clients: [".*/.*parameter.*", ".*/_internal/.*"],
                   action_servers: [".*/_internal/.*"],
                   action_clients: [".*/_internal/.*"]
               }
           },
           rest: { http_port: 8000 }
       }
   }

2. Zenoh Configuration on Ubuntu:

   {
       mode: "router",
       listen: { endpoints: ["tcp/0.0.0.0:7447"] },
       plugins: {
           ros2dds: {
               id: "edgeserver",
               namespace: "/turtlebot",
               deny: {
                   publishers: [".*/rosout", ".*/.*parameter.*", ".*/_internal/.*"],
                   subscribers: [".*/rosout", ".*/.*parameter.*", ".*/_internal/.*"],
                   service_servers: [".*/.*parameter.*", ".*/_internal/.*"],
                   Service_clients: [".*/.*parameter.*", ".*/_internal/.*"],
                   action_servers: [".*/_internal/.*"],
                   action_clients: [".*/_internal/.*"]
               }
           },
           rest: { http_port: 8000 }
       }
   }

3. Service Implementation on Ubuntu:

   import rclpy
   from rclpy.node import Node
   from std_srvs.srv import Trigger
   from lifecycle_msgs.srv import GetState
   
   class MapService(Node):
       def __init__(self):
           super().__init__('map_service')
           self.srv = self.create_service(Trigger, 'check_mapping', self.check_mapping_callback)
           self.lifecycle_client = self.create_client(GetState, '/rtabmap/get_state')
           while not self.lifecycle_client.wait_for_service(timeout_sec=1.0):
               self.get_logger().info('Waiting for lifecycle service to be available...')
   
       def check_mapping_callback(self, request, response):
           self.get_logger().info('Received request to check mapping status')
           future = self.lifecycle_client.call_async(GetState.Request())
           rclpy.spin_until_future_complete(self, future)
           lifecycle_state = future.result().current_state.label
   
           if lifecycle_state == 'active':
               response.success = True
               response.message = 'Mapping node is active'
           else:
               response.success = False
               response.message = f'Mapping node is in {lifecycle_state} state'
   
           self.get_logger().info(f'Sending response: {response.message}')
           return response
   
   def main(args=None):
       rclpy.init(args=args)
       node = MapService()
       rclpy.spin(node)
       rclpy.shutdown()
   
   if __name__ == '__main__':
       main()

4. Client Implementation on TurtleBot2i:

   import rclpy
   from rclpy.node import Node
   from std_srvs.srv import Trigger
   import os
   
   class MapClient(Node):
       def __init__(self):
           super().__init__('map_client')
           self.client = self.create_client(Trigger, 'check_mapping')
           while not self.client.wait_for_service(timeout_sec=1.0):
               self.get_logger().info('Waiting for map_service to be available on Ubuntu...')
           self.timer = self.create_timer(5.0, self.check_mapping_status)
   
       def check_mapping_status(self):
           request = Trigger.Request()
           future = self.client.call_async(request)
           future.add_done_callback(self.handle_response)
   
       def handle_response(self, future):
           try:
               response = future.result()
               if not response.success:
                   self.get_logger().info('Mapping is not active on Ubuntu, starting it locally on NUC.')
                   self.start_local_mapping()
           except Exception as e:
               self.get_logger().error(f'Service call failed: {str(e)}')
   
       def start_local_mapping(self):
           # Iniciar o mapeamento localmente no NUC
           os.system('ros2 launch my_package start_mapping_launch.py')
   
   def main(args=None):
       rclpy.init(args=args)
       node = MapClient()
       rclpy.spin(node)
       rclpy.shutdown()
   
   if __name__ == '__main__':
       main()

5. Start the service on the Ubuntu computer.

6. Attempt to call the service from the TurtleBot2i.

7. Observe the error:
   WARN zenoh_plugin_ros2dds::route_service_cli] Route Service Client (ROS:/check_mapping <-> Zenoh:turtlebot/check_mapping): received NO reply for request (6b771a6ecb3be14d,1) - cannot reply to client, it will hang until timeout.

The same happens with the add_two_ints_client and add_two_ints_server services from the demo_nodes_py package when the client is run before the server.

System info

• Platform: Ubuntu 22.04 64-bit
• CPU: Intel NUC BOXNUC6CAYH
• Zenoh version/commit: zenoh-bridge-ros2dds v0.10.1-rc.2 built with rustc 1.72.0 (5680fa18f 2023-08-23)