rosping is the tool to send ICMP ECHO_REQUEST to network hosts where roscore is running, and send back to you as rostopic message.
For echoing ROS node, use rosnode.
hunterlallen@protonmail.com
Hunter L. Allen
k-okada@jsk.t.u-tokyo.ac.jp
Kei Okada
https://github.com/tork-a/jsk_3rdparty/issues