how to publish sensor_msgs/Joy in C++ ?

edit

I already did check that using command in terminal using 'rostopic echo /teleop/joy'. But, I 'd like to check in my source code based on C++.

Here is my current test source code,

ros::Publisher  pub_joy;  
pub_joy = nh.advertise<sensor_msgs::Joy>("/teleop/joy", 1000);



   void push_joyBtnStart() {

    sensor_msgs::Joy joy;

    joy.buttons.clear();

    joy.buttons.push_back(0);   
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);   
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(1);   // means 'start' button
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);
    joy.buttons.push_back(0);   // 11

    pub_joy.publish(joy);

    ROS_INFO("pushed start button");
}

This running node while doing echo rostopic('teleop/joy') in terminal. But, result is no response.

Any idea about this issue ? or Did you find my problem of this situation ?

Thanks.