test_node.py

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#!/usr/bin/env python
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## Simple talker demo that publishes std_msg/Strings to the 'chatter' topic

PKG = 'test_rospy'
NAME = 'test_node'

import sys

import rospy
import test_ros.msg

# Copied from test_ros.test_node
#_required_publications  = 'test_string_out', 'test_primitives_out', 'test_arrays_out', 'test_header_out'
#_required_subscriptions = 'test_string_in', 'test_primitives_in', 'test_arrays_in', 'test_header_in', 'probe_topic'

## pass-through callback that republishes message on \a pub.
## @param pub TopicPub: topic to republish incoming messages on
## @return fn: callback fn for TopicSub
def chain_callback(pub):
    def chained_callback(data):
        # special logic for handling TestHeader
        if isinstance(data, test_ros.msg.TestHeader):
            if data.auto == 0:
                new_data = test_ros.msg.TestHeader()
                # when auto is 0, must send 1234, 5678 as time
                new_data.header.stamp = Time(1234, 5678)
                # frame_id not really important
                new_data.header.frame_id = 1234
            else: # force auto-header timestamp
                new_data = test_ros.msg.TestHeader(None, rospy.caller_id(), data.auto)
            data = new_data
        data.caller_id = rospy.caller_id()
        pub.publish(data)

def test_node():
    # required publications
    string_out = rospy.Publisher("test_string_out", test_ros.msg.TestString)
    primitives_out = rospy.Publisher("test_primitives_out", test_ros.msg.TestPrimitives)
    arrays_out = rospy.Publisher("test_arrays_out", test_ros.msg.TestArrays)
    header_out = rospy.Publisher("test_header_out", test_ros.msg.TestHeader)

    #required subs
    rospy.Subscriber("test_string_in", test_ros.msg.TestString, chain_callback(string_out))
    rospy.Subscriber("test_primitives_in", test_ros.msg.TestPrimitives, chain_callback(primitives_out))
    rospy.Subscriber("test_arrays_in", test_ros.msg.TestArrays, chain_callback(arrays_out))
    rospy.Subscriber("test_header_in", test_ros.msg.TestHeader, chain_callback(header_out))
     
    # subscription with no publisher
    probe_in = rospy.Subscriber("probe_topic", test_ros.msg.TestString)
    
    rospy.init_node(NAME)
    rospy.spin()
        
if __name__ == '__main__':
    test_node()