DFU 진행 중 LED 변경

- 이미지 업로드 중 초록/주황 LED 0.5초 교대 점멸

src/dfu/dfu_manager.c

@@ -173,14 +173,20 @@ static enum mgmt_cb_return dfu_status_cb(uint32_t event, enum mgmt_cb_return pre
         case MGMT_EVT_OP_IMG_MGMT_DFU_STARTED:
         case MGMT_EVT_OP_IMG_MGMT_DFU_CHUNK:
         case MGMT_EVT_OP_IMG_MGMT_DFU_CHUNK_WRITE_COMPLETE:
-            dfu_led_active = true;
-            led_ble_solid();
+            if (!dfu_led_active)
+            {
+                dfu_led_active = true;
+                led_dfu_progress();
+            }
             k_work_reschedule(&dfu_watchdog_work, K_SECONDS(DFU_STALL_TIMEOUT_SEC));
             break;
 
         case MGMT_EVT_OP_IMG_MGMT_DFU_PENDING:
-            dfu_led_active = true;
-            led_ble_solid();
+            if (!dfu_led_active)
+            {
+                dfu_led_active = true;
+                led_dfu_progress();
+            }
             k_work_cancel_delayable(&dfu_watchdog_work);
 
 #if NRF_POWER_HAS_GPREGRET