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Thanks for the reply. I just read the links to set the initial pose estimate and I wrote a publisher who writes on the topic /initialpose.... but if I do rostopic echo /initialpose nothing is published.....

pub = rospy.Publisher('initialpose', PoseWithCovarianceStamped, queue_size=10)
initpose = PoseWithCovarianceStamped()
initpose.header.stamp = rospy.get_rostime()
initpose.header.frame_id = "map"
initpose.pose.pose.position.x = x
initpose.pose.pose.position.y = y
quaternion = get_quaternion(theta)
initpose.pose.pose.orientation.w = quaternion[0]
initpose.pose.pose.orientation.x = quaternion[1]
initpose.pose.pose.orientation.y = quaternion[2]
initpose.pose.pose.orientation.z = quaternion[3]
pub.publish(init_pose)

I solved it, it was enough to insert a sleep after the Publisher statement

@Misrek please accept @ljaniec answer if led you to the solution. You can accept by clicking on the check mark. Thank you