更新版本号，发送间隔改为4s，最小公倍数为20

applications/core.c

@@ -495,7 +495,7 @@ static void upSendFile_thread_entry(void *parameter)
                     issendall=0;
 //                    break;
                 }
-                rt_thread_mdelay(5000);//发送间隔，目前服务器未处理，暂设为3s避免粘包
+                rt_thread_mdelay(4000);//发送间隔，目前服务器未处理，暂设为3s避免粘包
             }
         }
         if (issendall) {

applications/main.c

@@ -86,7 +86,7 @@ void show_version(void)
     char str[30];
     uint8_t t[10];
     size_t len=time2Byte(t);
-    rt_kprintf("SW Version: %s, build-%s\n","2.9d",bytes2str(t, 3, 10, "", str));
+    rt_kprintf("SW Version: %s, build-%s\n","2.91d",bytes2str(t, 3, 10, "", str));
 }
 
 MSH_CMD_EXPORT(show_version,显示版本号);