Hi everyone,

i want to access a Ros-Service e.g. over rosserial with parameter, what I am doing wrong?

#include <QCoreApplication>
#include "ros.h"
#include <ros/service_client.h>
#include <QDebug>
#include <string>
#include <stdio.h>
#include <windows.h>
#include <turtlesim/Spawn.h>
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    ros::NodeHandle nh;
    char *ros_master {nullptr};

    qDebug() << "connect to ros...";
    ros_master = "192.168.1.156:11411";
    nh.initNode (ros_master);

    ros::ServiceClient<turtlesim::Spawn::Request, turtlesim::Spawn::Response> turtle_client("spawn");

    turtlesim::Spawn::Request request;
    turtlesim::Spawn::Response response;

    request.name="mikey";
    request.x=3;
    request.y=3;
    request.theta=0;

    nh.serviceClient(turtle_client);
    turtle_client.call(request,response);
    qDebug() << "connected";

    while(!nh.connected()) nh.spinOnce();
    qDebug() << "Name " << response.name;


    return a.exec();
}

I got no Errors. IP and Port are correct. When I stop the rosserial-server I get "Failed to receive data from server 10093" as response. Rosserial with Publishing and Subscribing to a topic works, Services without parameter too, but not with parameter.

When I execute "rosservice call /spawn 3 3 0 mikey" direct in Terminal, I get as response "[ INFO] [1458045806.306323136]: Spawning turtle [mikey] at x=[3], y=[3], theta=[0]" but when i execute the code above i got nothing.

I thought, maybe I have an evident failure in my code !?