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I'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing. Try running both nodes and see what happens.

I'm II'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing. publishing (i.e.,callback functions are only called when the receive data on a topic). Try running both nodes and see what happens. happens

II'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing (i.e.,callback functions are only called when the they receive data on a topic). Try running both nodes and see what happens

II'm I'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing (i.e.,callback functions are only called when they receive data on a topic). Try running both nodes and see what happens

I'm assuming that you're doing the subscriber/publisher tutorial for rospy. Are you running the talker node? The listener node will only do something if there's a node publishing (i.e.,callback functions are only called when they receive data on a topic). Try running both nodes and see what happenshappens.