how to supress TF_OLD_DATA errors

edit

I'm trying to run multiple roslaunches in sequence from a python script.

When I try to rospy.init_node more than once after a signal_shutdown, the second init does work.

I am running roscore a single rospy.init_node and that works but gives me a flood of TF_OLD_DATA warnigs on the second roslaunch. An earlier answer here said to send an empty message to /reset_time however no such topic in indigo srcsim.

Things are working but the warnigs multple ones at 10 hz make it hard to debug the reset of the code.