test_node.py

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#!/usr/bin/env python

import rospy
from std_msgs.msg import String


rospy.init_node('test_node')

pub = rospy.Publisher('~output', String, queue_size=10)

def callback(data):
        print "Test node got", repr(data)
        pub.publish(data.data)

sub = rospy.Subscriber('~input', String, callback)

rospy.spin()