Hello,

i am getting the following error by running roswtf and i am stuck with that for a 3 weeks:

WARNING The following node subscriptions are unconnected:
 * /speed_controller:
   * /odom
 * /soundplay_node:
   * /sound_play/goal
   * /sound_play/cancel
   * /robotsound
 * /gazebo:
   * /gazebo/set_model_state
   * /gazebo/set_link_state

I have searched answers and this usually happens running it on different machines. However, i am trying to run it in the gazebo simulation. rosmaster has the same uri anywayz.

I have written the publisher and subscriber and named it as speed_controller.py. " python speed_controller.py" is the command to run the node. Code is from: http://www.theconstructsim.com/ros-qa-how-to-move-a-robot-to-a-certain-point-using-twist/:

 #! /usr/bin/env python

import rospy
from nav_msgs.msg import Odometry
from tf.transformations import euler_from_quaternion
from geometry_msgs.msg import Point, Twist
from math import atan2


x = 0.0
y = 0.0
theta = 0.0

def newOdom (msg):
    global x
    global y
    global theta

    x = msg.pose.pose.position.x
    y = msg.pose.pose.position.y

    rot_q = msg.pose.pose.orientation
    (roll, pitch, theta) = euler_from_quaternion([rot_q.x, rot_q.y, rot_q.z, rot_q.w])

rospy.init_node("speed_controller")



sub = rospy.Subscriber ("/odom", Odometry, newOdom)
pub = rospy.Publisher("/cmd_vel", Twist, queue_size = 1)

speed = Twist ()

r = rospy.Rate(4)

goal = point()

goal.x = 5
goal.y = 5


while not rospy.is_shutdown():
    inc_x = goal.x - x
    inc_y = goal.y - y

    angle_to_goal = atan2(inc_y, inc_x)

    if abs(angle_to_goal > 0.1):
        speed.linear.x = 0.0
        speed.angular.z = 0.3

    else:
        speed.linear.x = 0.0
        speed.angular.z = 0.5

pub.publish(speed)
r.sleep()

Most important part is to connect odom and speed_controller because i am not able to move my robot. It was working just fine before.

Thanks in advance.