dummy_head.py

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#!/usr/bin/env python

import rospy
from sensor_msgs.msg import JointState

def talker():
    pub = rospy.Publisher('/joint_states', JointState, queue_size=1)
    rospy.init_node('dummy_head')
    while not rospy.is_shutdown():
        msg = JointState()
        msg.name = []
        msg.name.append('head_axis_joint')
        msg.position = []
        msg.position.append(0)
#        msg.position.append(-3.14)
        pub.publish(msg)
        rospy.sleep(0.1)
if __name__ == '__main__':
    try:
        talker()
    except rospy.ROSInterruptException: pass