diff --git a/example/multi-mq/mock_ap/main.go b/example/multi-mq/mock_ap/main.go
index 0bca70a..404e150 100644
--- a/example/multi-mq/mock_ap/main.go
+++ b/example/multi-mq/mock_ap/main.go
@@ -11,22 +11,22 @@ import (
 
 func main() {
 	// connect to HPDS-MQ.
-	source := hpds_node.NewAccessPoint(
+	ap := hpds_node.NewAccessPoint(
 		"hpds-ap",
 		hpds_node.WithMqAddr("localhost:27188"),
 		hpds_node.WithCredential("token:z1"),
 	)
-	err := source.Connect()
+	err := ap.Connect()
 	if err != nil {
 		log.Printf("[AccessPoint] Emit the data to HPDS-MQ failure with err: %v", err)
 		return
 	}
-	defer source.Close()
+	defer ap.Close()
 
-	source.SetDataTag(0x33)
+	ap.SetDataTag(0x33)
 
 	// generate mock data and send it to HPDS-MQ.
-	err = generateAndSendData(source)
+	err = generateAndSendData(ap)
 	if err != nil {
 		log.Printf("[AccessPoint] >>>> ERR >>>> %v", err)
 		os.Exit(1)