link_joints.py

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#!/usr/bin/env python
#
# Copyright 2011 Shadow Robot Company Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 2 of the License, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along
# with this program.  If not, see <http://www.gnu.org/licenses/>.
#
import roslib; roslib.load_manifest('sr_hand')
import rospy
from sr_robot_msgs.msg import sendupdate, joint, joints_data
from sensor_msgs.msg import *

parent_name = "FFJ3"
child_name = "MFJ3"


def callback(data):
    """
    The callback function: called each time a message is received on the 
    topic /srh/shadowhand_data

    @param data: the message
    """
    message=[]
    if data.joints_list_length == 0:
        return
    # loop on the joints in the message
    for joint_data in data.joints_list:
        # if its the parent joint, read the target and send it to the child
        if joint_data.joint_name == parent_name:
            message.append(joint(joint_name=child_name, joint_target=joint_data.joint_target))
    
    # publish the message to the /srh/sendupdate topic.
    pub = rospy.Publisher('srh/sendupdate', sendupdate) 
    pub.publish(sendupdate(len(message), message))
    

def listener():
    """
    The main function
    """
    # init the ros node
    rospy.init_node('joints_link_test', anonymous=True)

    # init the subscriber: subscribe to the topic 
    # /srh/shadowhand_data, using the callback function
    # callback()
    rospy.Subscriber("srh/shadowhand_data", joints_data, callback)

    # subscribe until interrupted
    rospy.spin()


if __name__ == '__main__':
    listener()