diff --git a/bspMCU/l_stm32.c b/bspMCU/l_stm32.c
index 06cc3ed..f89b9d3 100644
--- a/bspMCU/l_stm32.c
+++ b/bspMCU/l_stm32.c
@@ -440,6 +440,13 @@ static int l_sendto(lua_State *L)
         }
         pData = buf;
     }
+    else if (lua_isinteger(L, 3))
+    {
+        static int32_t val;
+        val = (int32_t)lua_tointeger(L, 3);
+        pData = &val;
+        uiDataLen = sizeof(val);
+    }
 
     int ret = MsgCenter_SendTo(pszDstName, uiMsgID, pData, uiDataLen);
     lua_pushinteger(L, ret);