Creating a throttle node

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Ha! So simple that I didn't even try that. Thanks!

This is the correct answer but I wish there were a way to inform a node that you don't need the data at the higher rate. Without this capability, a lot of processing is wasted on the publisher.

I have tried this but I can not get the rate I want. For example, my input_topic is 200Hz, but my input_topic_throttled is only 25Hz, even if I use 100 in the args.

Ik it's a very late reply to this post but replying if it can help someone else. for @ZiyangLl comment, you can write it like this:

<launch>
<node name = "input_topic_throttler" type="drop" pkg="topic_tools" args= "/input_topic 7 8 /input_topic_throttled" />
</launch>

This will drop every 7 frames of incoming 8 frames, So 200/8 = 25 Hz (taking only one frame from every 8 frames, from a 200 frame stack)

@one I guess we replace input_topic with the actual topic I wish to throttle? Also, I would have to make a script where I create the node right?

Yes, input_topic is the topic you want to throttle. I think you can directly add it to your launch file http://wiki.ros.org/topic_tools/throttle