Why is this simple service not returning anything ?

edit

Hi,

I am new to ROS and have a little problem regarding services.
Right now I am sending a request to the server, triggering the handle_speech function.
In this function I subscribe to the pocketsphinx recognizer/output node.
When I return an integer value from here, the client receives it and shows it to me.

But when I return a value from the speechCB callback function, the client shows nothing.
What am I doing wrong here?

Edit: Now it is working, but this code is not my best coding ;)

#!/usr/bin/env python
import roslib; roslib.load_manifest('kmr01')

from kmr01.srv import *
import rospy

from std_msgs.msg import String

command = 0

def handle_speech(req):
  print "handling speech input"
  rospy.Subscriber('recognizer/output', String, speechCb)

  r = rospy.Rate(10.0)
  while not rospy.is_shutdown():
    r.sleep()
    print "sleeping"
    if command != 0:
      return RecognizeSpeechResponse(command)

def speechCb(msg):
  global command
  print "speechCB"

  if msg.data.find("forward") > -1:    
    command = 2  

  elif msg.data.find("stop") > -1 or msg.data.find("halt") > -1:          
    command = 1    

  print "nothing recognized"    
  command = 99    


def recognize_speech_server():
  rospy.init_node('recognize_speech_server')
  s = rospy.Service('recognize_speech', RecognizeSpeech, handle_speech)
  print "Ears wide open ..."
  rospy.spin()

if __name__ == "__main__":
  recognize_speech_server()

Regards Max