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It is possible but messy using terminal command:

rosrun navigation waypoints
sleep 45
rosnode kill waypoints
rosrun navigation waypoints
sleep 45
rosnode kill waypoints

if you put those line of code in a terminal file, you can run it and it will perform your node every 45 seconds.

• mkdir ~/bin
• put your line of code inside a simple file, let's say waypoint
• chmod +x waypoint
• export PATH=$PATH:~/bin in your ~/.bashrc
• then in another terminal just type waypoint