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It would be something like this:

#include <std_msgs/Int8.h>

msg.data = 17;
ROS_INFO("%d", msg.data);
chatter_pub.publish(msg);

It would be something like this:

#include <std_msgs/Int8.h>

std_msgs::Int8 msg;
msg.data = 17;
ROS_INFO("%d", msg.data);
chatter_pub.publish(msg);

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