Communication between Node and Nodelet [closed]

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Hi,

I have a question. I created a nodelet and I want to initialize the nodelet with a specific name.

 ros::NodeHandle private_nh_;
 ros::Subscriber sub_;

 void callback(const std_msgs::StringConstPtr& str) {
 ROS_INFO("CALLBACK METHODE");
 }

 void onInit() {
    ROS_INFO("ON INIT CALLED");
   private_nh_ = getPrivateNodeHandle(); 
    sub_ = private_nh_.subscribe("myServo", 1,
        &callback, this);
}

I thought that the best way to do it is to build a subscriber.

I create the nodelet in a node shown below:

   int main(int argc, char **argv) {
     ros::init(argc, argv, "robotnodelet2");
     ros::NodeHandle nh;
 nodelet::Loader nodelet;
 nodelet::M_string remap(ros::names::getRemappings());
 nodelet::V_string nargv;
 nodelet.load("robotnodelet2/ServoImpl", "robotnodelet2/ServoImpl", remap,
        nargv);

ROS_INFO("PUBLISH SERVONAME");
pub = nh.advertise<std_msgs::String>("myServo", 1);//servo_name
std_msgs::StringPtr str(new std_msgs::String);
str->data = "servo1";
pub.publish(str);
   }

The Problem I have is that the callback methode is not called. I dont know why. Should I use the CallbackQueueManager or how I can interact and share informations between a node and the loaded nodelet. Thanks for any help. Philipp