Publish to Topics of different node [Solved]

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Here is a complete template where I'm using this for a 7-dof dynamixel arm for sending joint values from .cpp node..

here is a node where I'm publishing to topics of another node and those particular topics are /joint0_controller/command /joint1_controller/command /joint2_controller/command /joint3_controller/command /joint4_controller/command /joint5_controller/command /joint6_controller/command /joint7_controller/command

and msg type is std_msgs/Float64

################# .cpp code.......... ################

#include <ros/ros.h>
#include <tf/transform_listener.h>
#include <geometry_msgs/Twist.h>

// Message publication
#include "std_msgs/MultiArrayLayout.h"
#include "std_msgs/MultiArrayDimension.h"
#include "std_msgs/Float32MultiArray.h"
#include "std_msgs/Float64.h"
#include <std_msgs/Float64.h>
#include <sstream>

    using namespace std;

    // publisher declaration
    ros::Publisher shoulder_roll_joint, shoulder_pitch_joint, shoulder_yaw_joint,
                        elbow_pitch_joint, elbow_yaw_joint, wrist_pitch_joint, wrist_roll_joint, gripper_joint;



int main(int argc, char** argv)
{
    ros::init(argc, argv, "arm_joints");
    ros::NodeHandle nh;

    // publisher declaration

    shoulder_roll_joint = nh.advertise<std_msgs::Float64>("/joint0_controller/command", 1);
    shoulder_pitch_joint = nh.advertise<std_msgs::Float64>("/joint1_controller/command", 1);
    shoulder_yaw_joint = nh.advertise<std_msgs::Float64>("/joint2_controller/command", 1);
    elbow_pitch_joint = nh.advertise<std_msgs::Float64>("/joint3_controller/command", 1);
    elbow_yaw_joint = nh.advertise<std_msgs::Float64>("/joint4_controller/command", 1);
    wrist_pitch_joint = nh.advertise<std_msgs::Float64>("/joint5_controller/command", 1);
    wrist_roll_joint = nh.advertise<std_msgs::Float64>("/joint6_controller/command", 1);
    gripper_joint = nh.advertise<std_msgs::Float64>("/joint7_controller/command", 1);


    ros::Rate rate(50.0); // frequency of operation

    while (1)
    {   
        std_msgs::Float64 areaValue;
        std_msgs::Float64 Joint0, Joint1, Joint2, Joint3, Joint4, Joint5, Joint6, Joint7;

        Joint0.data = 0.0;
        Joint1.data = -1.2; 
        Joint2.data = 0.0; 
        Joint3.data = -1.2;
        Joint4.data = -1.2; 
        Joint5.data = -1.2;
        Joint6.data = 0.0;
        Joint7.data = 0.0;

        shoulder_roll_joint.publish(Joint0);
        shoulder_pitch_joint.publish(Joint1);
        shoulder_yaw_joint.publish(Joint2);
        elbow_pitch_joint.publish(Joint3);
        elbow_yaw_joint.publish(Joint4);
        wrist_pitch_joint.publish(Joint5);
        wrist_roll_joint.publish(Joint6);
        gripper_joint.publish(Joint7);


        rate.sleep();


    }
    return 0;

};

Hope it helps someone.

if anyone finds error or difficulty in understanding then please let me know.

Regards, Prasanna