This will call service to /eus_command with jsk_rviz_plugins/EusCommand srv.
All the buttons are configured via
robot_command_interface_sample.launch file to know how to use it.
Parameter format is:
robot_command_buttons: - name: <name, required> icon: <path to icon file, optional> type: <"euscommand" or "emptysrv", required> command: <S expression to send to eusclient, required if type is euscommand> srv: <service name, required if type is "emptysrv"> - name: ...