diff --git a/wp-admin/admin-ajax.php b/wp-admin/admin-ajax.php
index 9f5f025b4c..ed1ef9e499 100644
--- a/wp-admin/admin-ajax.php
+++ b/wp-admin/admin-ajax.php
@@ -67,6 +67,7 @@ if ( ! empty( $_POST['action'] ) && in_array( $_POST['action'], $core_actions_po
 	add_action( 'wp_ajax_' . $_POST['action'], 'wp_ajax_' . str_replace( '-', '_', $_POST['action'] ), 1 );
 
 add_action( 'wp_ajax_nopriv_autosave', 'wp_ajax_nopriv_autosave', 1 );
+add_action( 'wp_ajax_nopriv_heartbeat', 'wp_ajax_nopriv_heartbeat', 1 );
 
 if ( is_user_logged_in() )
 	do_action( 'wp_ajax_' . $_REQUEST['action'] ); // Authenticated actions
diff --git a/wp-admin/includes/ajax-actions.php b/wp-admin/includes/ajax-actions.php
index bd4d5b93c4..7f09a4f557 100644
--- a/wp-admin/includes/ajax-actions.php
+++ b/wp-admin/includes/ajax-actions.php
@@ -2081,12 +2081,12 @@ function wp_ajax_heartbeat() {
 	check_ajax_referer( 'heartbeat-nonce', '_nonce' );
 	$response = array();
 
-	// screenid is the same as $current_screen->id and the JS global 'pagenow'
+	// screen_id is the same as $current_screen->id and the JS global 'pagenow'
 	if ( ! empty($_POST['screenid']) )
 		$screen_id = sanitize_key($_POST['screenid']);
 	else
 		$screen_id = 'site';
-	
+
 	if ( ! empty($_POST['data']) ) {
 		$data = wp_unslash( (array) $_POST['data'] );
 		// todo: how much to sanitize and preset and what to leave to be accessed from $data or $_POST..?
@@ -2106,9 +2106,31 @@ function wp_ajax_heartbeat() {
 	// send the current time acording to the server
 	$response['servertime'] = time();
 
-	// Change the interval, format: array( speed, ticks )
-	if ( isset($response['heartbeat_interval']) )
-		$response['heartbeat_interval'] = (array) $response['heartbeat_interval'];
+	wp_send_json($response);
+}
+
+function wp_ajax_nopriv_heartbeat() {
+	$response = array();
+
+	// screen_id is the same as $current_screen->id and the JS global 'pagenow'
+	if ( ! empty($_POST['screenid']) )
+		$screen_id = sanitize_key($_POST['screenid']);
+	else
+		$screen_id = 'site';
+
+	if ( ! empty($_POST['data']) ) {
+		$data = wp_unslash( (array) $_POST['data'] );
+		$response = apply_filters( 'heartbeat_nopriv_received', $response, $data, $screen_id );
+	}
+
+	$response = apply_filters( 'heartbeat_nopriv_send', $response, $screen_id );
+
+	// Allow the transport to be replaced with long-polling easily
+	do_action( 'heartbeat_nopriv_tick', $response, $screen_id );
+
+	// send the current time acording to the server
+	$response['servertime'] = time();
 
 	wp_send_json($response);
 }
+
diff --git a/wp-includes/general-template.php b/wp-includes/general-template.php
index 4385e4b2e3..de94d0ba51 100644
--- a/wp-includes/general-template.php
+++ b/wp-includes/general-template.php
@@ -2287,6 +2287,8 @@ function __checked_selected_helper( $helper, $current, $echo, $type ) {
  * @return array $settings
  */
 function wp_heartbeat_settings( $settings ) {
-	$setting['nonce'] = wp_create_nonce( 'heartbeat-nonce' );
+	if ( is_user_logged_in() )
+		$setting['nonce'] = wp_create_nonce( 'heartbeat-nonce' );
+
 	return $setting;
 }
diff --git a/wp-includes/js/heartbeat.js b/wp-includes/js/heartbeat.js
index 76e34875d0..a3825996b4 100644
--- a/wp-includes/js/heartbeat.js
+++ b/wp-includes/js/heartbeat.js
@@ -95,6 +95,7 @@ window.wp = window.wp || {};
 			tick = time();
 
 			data.data = $.extend( {}, queue );
+			$(document).trigger( 'heartbeat-send', [data.data] );
 
 			data.interval = interval / 1000;
 			data._nonce = nonce;