Send data from a wordpress post to an external php

That such guys would like to send the data of a newly created post to an external php with the action of wordpress, but I do not know how to do it, I have tried with ajax but apparently it is not executed

function enviar_datos( $post_id ) {
    $post_title = get_the_title( $post_id );
    //enviar variable $post_title a un php en otro servidor
}
add_action('publish_post', 'enviar_datos', 20);

How could I do it? I've already tried with ajax and it does not work

wp_register_script(
        'your-script', 
        get_template_directory_uri() . '/js/ajax_test.js', 
        array('jquery') 
    );

function enviar_datos( $post_id ) {
    var titulo = $post_title = get_the_title( $post_id );
    $params = array (
      'varHome' => titulo
  );

wp_enqueue_script('your-script');
wp_localize_script('your-script','vars_inline',$params);
}
add_action('publish_post', 'enviar_datos', 1);


AJAX
jQuery(document).ready(function($) {
var datos =vars_inline.varHome;
jQuery.ajax({
  type: "POST",
  url: 'http://ejemplo.com/pruebas/index.php',
  data: { datosz: datos },
  success: function( data ) {
    console.log(data);
  }
});
})

Or if you know of a plugin that triggers an event when a new post is created and sent me the data

Thanks in advance