[AT Release] ESP8266_AT_V1.1 based on ESP8266_NONOS_SDK_V1.5.4

[ESP_Faye]

ESP8266_AT_v1.1 Release based on ESP8266_NONOS_SDK_V1.5.4

1. Use Espressif official Flash Download Tool to download AT firmware bin files into Flash according to the "readme" which is in the attachment.
   

   Notice:
   1. Firmware upgrade through Wi-Fi (AT+CIUPDATE) is not supported in non-boot mode.
   2. 4Mbit Flash is not supported in both non-boot mode and with-boot mode.
   

2. Firmware upgrade over-the-air process is changed a bit. We will upgrade the latest AT firmware to Espressif Cloud server only after it has been tested and the overall performance is guaranteed. Users may not be able to use AT+CIUPDATE in ESP8266_NONOS_SDK_V1.5.0 and other more advanced versions.

Important Links
Here are the links for this AT release (version ESP82566_AT_v1.1 based on ESP8266_NONOS_SDK_V1.5.4):

1. ESP8266_NONOS_SDK_V1.5.4
2. AT Commands Documentation
3. Bug Bounty Program

Release Notes
Optimization:

1. Optimized the behavior of writing Flash.
2. Optimized DHCP server function.
3. Updated command AT+SAVETRANSLINK to save domain name.

Have fun!

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ESP8266_AT_v1.1 发布，基于 ESP8266_NONOS_SDK_V1.5.4

1. 请使用 Espressif 官方 Flash Download Tool，参考附件压缩包中的 readme 烧录 AT 固件到 Flash 中。
   

   注意：
   

   1. non-boot 模式不支持升级功能 (AT+CIUPDATE)。
   2. AT 固件的 non-boot 模式和 with-boot 模式均不支持 4Mbit Flash。

2. 我司优化了 AT 固件的升级流程 (AT+CIUPDATE)，AT 固件发布后，等待一段时间，待客户反馈稳定后，才上传到 Espressif Cloud 以供下载更新。因此，如果使用 ESP8266_NONOS_SDK_V1.5.0 及之后版本的 AT 固件暂时无法从 Espressif Cloud 升级。

相关下载

以下是最新 SDK 的相关下载链接 (版本 ESP8266_AT_v1.1 基于 ESP8266_NONOS_SDK_V1.5.4):

1. ESP8266_NONOS_SDK_V1.5.4。
2. AT 文档下载链接。
3. 您可以继续参与 Bug Bounty 计划。

发布说明
优化:

1. 优化 AT 固件写 Flash 的行为。
2. 优化 DHCP server 功能。
3. 新增 AT+SAVETRANSLINK 对保存域名的支持。

感谢您对 ESP8266 的关注！