最新版cc2640r2f SDK 1_40_00_45中的示例
simple_peripheral_cc2640r2lp_oad_offchip_stack\TOOLS 中的build_config.opt中，定义了
/* BLE v4.1 Features */
/* This is needed to use GATT_SERVICE_CHANGED */
-DV41_FEATURES=L2CAP_COC_CFG
但是没有定义V42_FEATURES
/* BLE v4.2 Features */
/* Note: For advanced users who choose to explicitly build their BLE */
/* Stack without ROM the following upper limit on RAM usage must be */
/* observed when using the Secure Connections Feature: */
/* R1: 0x20004F2C */
/* R2: 0x20004F80 */
/* When using linker command files provided by this SDK, the linker */
/* symbol ENCRYPTION_ROM=1 or ENCRYPTION_ROM=2 may be defined to set */
/* this upper limit for R1 and R2 devices, respectively. */
;
但是在之前的sdk_1_35_00_33\examples\rtos\CC2640R2_LAUNCHXL\blestack\simple_peripheral_oad_offchip\tirtos\iar文件下定义了：
-DV42_FEATURES=SECURE_CONNS_CFG
却关闭了：
/* BLE v4.1 Features */
/* -DV41_FEATURES=L2CAP_COC_CFG */
这个更改具体是什么含义？
另外，我使用的工程依据sdk_1_40_00_45配置build_config.opt，测试过程中发现蓝牙4.2以上版本，通信时主机很容易断开，但是iPhone 7 也是BT4.2版本，就很稳定，什么情况这是？
如果依据1_35_00_33，或者V41/V42_features全部打开,iphone 7 连接困难，比如首次连接很容易失败，或者连接后经常断开，蓝牙4.1以下版本又正常，这又是什么情况？
以上三个问题，望解答！