Liangqian

I think We can start reviewing part by part

We suspended the portion of `tianracer` on ROS2 dashing In fact, dashing is too old and its ecological is not good. Some packages do not support dashing, such as `laser_filters`...

Hi @tianb03. We've replaced Jetson Nano with Raspberry that could support 20.04 officially and installed galactic It would be better for us to discuss it in a new branch (galactic-devel)....

OK. dashing-devel will not be maintained anymore

Hi @jediofgever The pbstream file can be obtained by calling the service `/write_state `. For example, ``` ros2 service call /write_state cartographer_ros_msgs/srv/WriteState filename:\ test.pbstream ``` And I recently have made...

Hi @clalancette, the CI error shows the packages "rosbag2_cpp" and "urdf" can not be found. I’m not sure if the ROS index page, [urdf](https://index.ros.org/p/urdf/github-ros2-urdf/#rolling) and [rosbag2_cpp](https://index.ros.org/p/rosbag2_cpp/#rolling) has indicated that these...

Friendly ping @clalancette