public OdometryMessage(HeaderMessage header, string child_frame_id, PoseWithCovarianceMessage pose, TwistWithCovarianceMessage twist)
 {
     this.header         = header;
     this.child_frame_id = child_frame_id;
     this.pose           = pose;
     this.twist          = twist;
 }
 public OdometryMessage()
 {
     this.header         = new HeaderMessage();
     this.child_frame_id = "";
     this.pose           = new PoseWithCovarianceMessage();
     this.twist          = new TwistWithCovarianceMessage();
 }