exampleService.py

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#!/usr/bin/env python

""" 
Sample code to use with ServiceClient.pde
"""

import roslib; roslib.load_manifest("rosserial_arduino")
import rospy

from rosserial_arduino.srv import *

def callback(req):
    print "The arduino is calling! Please send it a message:"
    t = TestResponse()
    t.output = raw_input()
    return t

rospy.init_node("service_client_test")
rospy.Service("test_srv", Test, callback)
rospy.spin()