Tomoya Fujita

@leeminju531 we had a discussion on the information from `ros2 service info -v` and rmw data structure for this. as in `rmw`, service information structure should not be dependent implementation...

@leeminju531 thanks for the update and checking in details. images are broken, especially for zenoh one, could you attach it again?

> DDS internally addresses services as topics, making it challenging to collect the service type hash within the graph cache. Currently, it seems feasible to retrieve only the topic type...

hmmm, yeah this is hard to come up with good solution. i mean we can add service type hash and graph to the DDS-based rmw implementation like rmw_zenoh, but it...

@leeminju531 so we talked about this at ROS PMC once again. - (we already know) single service type hash needs to be printed with `ros2 service info -v` on service....

@Mergifyio rebase

Pulls: ros2/ros2cli#916, ros2/rmw#371, ros2/rmw_implementation#238, ros2/rmw_fastrtps#771, ros2/rmw_cyclonedds#499, ros2/rmw_connextdds#154, ros2/rcl#1161, ros2/rclcpp#2569, ros2/rclpy#1307, ros2/rmw_dds_common#82, ros2/rmw_zenoh#679 Gist: https://gist.githubusercontent.com/fujitatomoya/01385d70469b48f205a68e21219fd395/raw/b02c84fd17938124e2b045dbf016f260e6209ae0/ros2.repos BUILD args: --packages-above-and-dependencies rmw_zenoh_cpp rmw_dds_common rclpy rclcpp_lifecycle rclcpp rcl rmw_connextdds rmw_connextdds_common rmw_connextddsmicro rmw_cyclonedds_cpp rmw_fastrtps_cpp rmw_fastrtps_dynamic_cpp rmw_fastrtps_sharedcpp...

Pulls: ros2/ros2cli#916, ros2/rmw#371, ros2/rmw_implementation#238, ros2/rmw_fastrtps#771, ros2/rmw_cyclonedds#499, ros2/rmw_connextdds#154, ros2/rcl#1161, ros2/rclcpp#2569, ros2/rclpy#1307, ros2/rmw_dds_common#82, ros2/rmw_zenoh#679 Gist: https://gist.githubusercontent.com/fujitatomoya/3c50929d3b3e884ba6796f6c9f26e92e/raw/b02c84fd17938124e2b045dbf016f260e6209ae0/ros2.repos BUILD args: --packages-above-and-dependencies rmw_zenoh_cpp rmw_dds_common rclpy rclcpp_lifecycle rclcpp rcl rmw_connextdds rmw_connextdds_common rmw_connextddsmicro rmw_cyclonedds_cpp rmw_fastrtps_cpp rmw_fastrtps_dynamic_cpp rmw_fastrtps_shared_cpp...

@Yadunund besides that, we are verifying this with full CI on https://github.com/ros2/ros2cli/pull/916#issuecomment-3510999380

@Mergifyio rebase