Hi Manuel.....

Maybe this post will help you: http://answers.ros.org/question/2151/how-do-i-publish-exactly-one-message

Benoit

From: Manuel Rodríguez 
Sent: Friday, October 21, 2011 10:35 AM
To: User discussions 
Subject: [ros-users] Problems publishing topics

Hi all, 

I'm trying to publishing to a topic but I have an absurd problem:

When I use this:
  self.pub = rospy.Publisher('arm_controller/command', JointTrajectory)
  msg = JointTrajectory()
  self.pub.publish(msg)
it does not publish absolutly nothing. 

But, if I use the pub.publish inside an infinite loop, it works:
  self.pub = rospy.Publisher('arm_controller/command', JointTrajectory)
  msg = JointTrajectory()
  while True:
            self.pub.publish(msg)


I can publish with -rostopic pub- without problems, so it's a code problem? What I should change?

Best regards
manuel







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