Program getting stuck at line - "sac.wait_for_server()". Unable to send goals to turtlebot robo.

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Hello All,

I have connected to turtlebot using a separate machine. Now using that separate machine, I am trying to pass goals to robo but while running code, program waits at line "sac.wait_for_server()" so goals are not able to publish to robo. But while I am using the machine and inside gazebo simulated environment(not connecting to external robo) then the code is working fine and all the goals are send, also Robo inside gazebo moving. But I am unable to figure out why the real robo is not working. Please help me in fixing the issue. also if any one of you have working python code to send goals to move turtlebot.. pls share.

Thanks for any help.

I am attaching the code here:::

#!/usr/bin/env python

import roslib; roslib.load_manifest('beginner_tutorials')
import rospy
import actionlib
from geometry_msgs.msg import *
#move_base_msgs
from move_base_msgs.msg import *

def simple_move():
  try:
    rospy.loginfo("Start")
    rospy.init_node('simple_move')

    #Simple Action Client
    sac = actionlib.SimpleActionClient('move_base', MoveBaseAction )

    #create goal
    goal = MoveBaseGoal()
    x = ['1.500'  , '0.000']
    location =  Pose(Point(float(x[0]),float(x[1]), 0.000), Quaternion(0.000, 0.000, 0.000, 0.777))
    goal.target_pose.pose = location

    #use self?
    #set goal
    #goal.target_pose.pose.position.x = 1.0
    #goal.target_pose.pose.orientation.w = 1.0
    goal.target_pose.header.frame_id = 'map'
    goal.target_pose.header.stamp = rospy.Time.now()
    rospy.loginfo("Setted Pose")
    rospy.loginfo("wait for server")
    #start listner
    sac.wait_for_server()
    rospy.loginfo("send goal")
    #send goal
    sac.send_goal(goal)
    rospy.loginfo("wait for result")
    #finish
    sac.wait_for_result()
    rospy.loginfo("printing result"+str(sac.get_result()))
    #print result
    print sac.get_result()



  except Exception, inst:
    print "Error"+str(inst)

if __name__ == '__main__':
    try:
    rospy.loginfo("1")
        simple_move()

    except rospy.ROSInterruptException:
        print "Keyboard Interrupt"