Errors using robot_monitor
GUI doesn't come up or stays empty
If you see something like:
Unable to register with master node [http://localhost:11311/]: master may not be running yet. Will keep trying.
GUI Turns Gray Frequently
When the robot_monitor turns gray, it means that it doesn't hear from the /diagnostics_agg topic.
Use rostopic to make sure the topic is still published.
rostopic info diagnostics_agg
Listen to /diagnostics_agg to listen to the data.
rostopic echo diagnostics_agg
Try contacting the Master and make sure that you can ping the robot.