ESP8266_NONOS_SDK_V2.0.0_16_07_19

1. Updated libphy.a to 1055, fixed an issue of large current in Light-sleep.
2. Updated AT+ to 1.3.0:
   2.1 Added Light-sleep wakeup command, AT+WAKEUPGPIO;
   2.2 Fixed abnormal AT+CWDHCPS IP allocation;
   2.3 Added at_sdio demo under example directory.
3. Fixed probable system default when calling cur and def interfaces.
4. Fixed the issue of high current in Deep-sleep mode without disabling SPI first.
5. Fixed an issue where the SDK would crash when switching from AP to Station mode by calling wifi_set_phy_mode.
6. Updated secondary boot loader to v1.6:
   6.1 Supports AT + based on SDIO;
   6.2 Supports entering testing mode through GPIO.
7. Added support for MXIC Flash QIO mode.
8. Fixed exception caused during TCP handshake and retransmission.
9. Fixed issues in ESP-NOW.
10. Added ESP-PAIR (Simple-Pair) feature, for APIs please refer to ESP8266 SDK API Guide.
11. wpa2-enterprise time function derivation and time check disable can be set by users.
12. Support for PEAP/TTLS in wpa2-enterprise, for APIs please refer to ESP8266 SDK API Guide.
13. Added mqtt demos under examples directory.
14. Other issue fixes.
15. Resolved an issue that RF_Init_data sector may be broken in stress test. Provided a function user_rf_cal_sector_set which has to be added in application by software developer. More details about user_rf_cal_sector_set refer to documentation "2C-ESP8266__SDK__API Guide". (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)
16. Fix a potential risk that will cause rf not work after external reset. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)
17. Add SDIO AT support. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)
18. Fix a potential bug in espconn. (Resolved in ESP8266_NONOS_SDK_V1.5.4.1)

License

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+ESPERSSIF MIT License
+
+Copyright (c) 2015 <ESPRESSIF SYSTEMS (SHANGHAI) PTE LTD>
+
+Permission is hereby granted for use on ESPRESSIF SYSTEMS ESP8266 only, in which case, it is free of charge, to any person obtaining a copy of this software and associated documentation files (the ��Software��), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED ��AS IS��, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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+���� MIT ����֤
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+��Ȩ (c) 2015  <������Ϣ�Ƽ����Ϻ������޹�˾>
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