I have a simulator running which publishes the `/clock` topic, and I have the `/use_sim_time` parameter set to true.
When I start my ROS core and run the simulator the first time, things run normally.
If I stop the simulator and restart it, restarting the clock at 0, I get TF warnings from all of the nodes that are subscribed to TF:
[ WARN] [1399927275.284426178, 678.770000000]: TF_OLD_DATA ignoring data from the past for frame local_utm at time 678.77 according to authority /simulator
Possible reasons are listed at http://wiki.ros.org/tf/Errors%20explained
Is there any way to reset the clock and clear the TF buffer?
According to [this post](http://roslauragalindez.blogspot.com/2010/08/tf-troubles.html), there should be a `/reset_clock` topic that I can publish a std_msgs::Empty to to trigger a clock reset, and a `Reset` button in rivz which will do this for me, but the `/reset_clock` topic doesn't seem to exist, and while the button in rviz still exists, it doesn't seem to have the desired effect.
I'm currently using ROS Hydro on Ubuntu 12.04.
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