Stop publishing a specific topic

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Hi,

For testing purposes I want to stop the subscription of a topic during runtime (not programatically). I would like to know if there is any tool that allows this, any command that would allow this (or an XMLRPC to the ROS master to stop that topic, or something like that).

I do not want to kill the publishing node because what I want to do is to simulate a communication link lost. I was thinking that, if there is nothing, I would use topic_tools relay to remap the topic and then just kill the relay, but requires modifying the remaps on the launchfile (something I would like to avoid).

Thank you!