diff --git a/test/case52/src/testcase52.c b/test/case52/src/testcase52.c
index fd6b95c..f48bc0d 100755
--- a/test/case52/src/testcase52.c
+++ b/test/case52/src/testcase52.c
@@ -192,7 +192,7 @@ void *handleUdpTransmission(void *arg)
     uint8_t block_n = 0;
     uint8_t cut_i = 0;
     while (1)
-    {
+    {   printf("[slot]:%u \n", slot_ind_flag);
         if (1 == slot_ind_flag)
         {