diff --git a/main/mqtt.c b/main/mqtt.c
index b94e2ed..c2ba1a8 100644
--- a/main/mqtt.c
+++ b/main/mqtt.c
@@ -72,15 +72,16 @@ static void mqtt_event_handler(void *handler_args, esp_event_base_t base,
       break;
     case MQTT_EVENT_DATA:
       ESP_LOGI(MQTT_TAG, "MQTT_EVENT_DATA");
-      if (strcmp(event->topic, MQTT_KEY_BOARD_ONLINE)) {
+      if (strncmp(event->topic, MQTT_KEY_DESKTOP_ONLINE, event->topic_len) ==
+          0) {
         xEventGroupSetBits(s_mqtt_event_group, MQTT_DESKTOP_ONLINE_BIT);
-        ESP_LOGE(MQTT_TAG, "AAA MQTT_DESKTOP_ONLINE_BIT");
-      } else if (strcmp(event->topic, MQTT_KEY_DESKTOP_COLORS)) {
-        ESP_LOGE(MQTT_TAG, "AAA MQTT_DESKTOP_SENDING_BIT");
+      } else if (strncmp(event->topic, MQTT_KEY_DESKTOP_COLORS,
+                         event->topic_len) == 0) {
         xEventGroupSetBits(s_mqtt_event_group, MQTT_DESKTOP_SENDING_BIT);
+      } else {
+        printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
+        printf("DATA=%.*s\r\n", event->data_len, event->data);
       }
-      printf("TOPIC=%.*s\r\n", event->topic_len, event->topic);
-      printf("DATA=%.*s\r\n", event->data_len, event->data);
       break;
     case MQTT_EVENT_ERROR:
       ESP_LOGI(MQTT_TAG, "MQTT_EVENT_ERROR");