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Title Body Platformsort descending Version Release Date Download
ESP8266 Add Low-power Cmd

Provides low-power command added to binaries.

Python V2.0 2016.04.27
ESP8266 IOT Platform

A demo that should be run with ESP8266 RTOS SDK. This is the Initial version.

RTOS V1.0 2015.09.18
ESP-BluFi for Android

Configure BluFi device

Android v1.5.3 2020.03.26
ESP-MESH for Android

Android App for ESP-MESH Smart Light

Android v1.2.3 2020.05.29
ESP-Drone for Android
Android v1.0.0 2020.07.14
ESP-TOUCH for Android

Make device connect to AP

Android v2.0.0 2021.02.08
ESP-BluFi for iOS

BluFi for iOS

IOS v1.2.0 2020.07.19
IOS v1.1.1 2019.12.20
ESP-Drone for iOS
IOS v1.0.1 2020.07.20


IOS v2.0.0 2020.04.20
ESP8266 RTOS SDK V1.5.0

Added features:

1. SPI flash erase protection mechanism (With this mechanism, boot.bin and current running user.bin cannot be erased.)
2. user_rf_cal_sector_set, an interface the user program MUST have
3. MemLeak debugging feature
4. SNTP support
5. Vendor IE support
6. Weak function wifi_set_backup_mac for setting user MAC
7. mbedTLS support

Improved features:

1. Updated SmartConfig to v2.5.4
2. Updated open freedom to support sending beacon packets
3. Updated libphy.a to v1055
4. Updated secondary bootloader to v1.6
5. Updated esp_init_data_default.bin
6. Optimized socket mechanism
7. Optimized sleep strategy

Fixed problems:

1. lwIP problem
2. PWM problem
3. SPI overlap problem
4. DNS problem with some routers
5. The maximum value of os_timer_arm
6. Exceptional RF failure after external reset;
7. Huawei X4’s failure to connect to Soft-AP
8. A problem in libpp.a that causes system assert
9. System crash when setting opmode from Station to Soft-AP in scan done callback
10. Status error by calling wifi_station_get_connect_status when the password is wrong
11. Disconnect event is prevented from entering twice when calling wifi_station_disconnect.
12. The SPI flash erase / write processes are modified. Before erasing or writing SPI flash, write-protected status will be cleared if need be.
13. Some cases where the RF_Init_data system parameter sector could be corrupted are fixed.
14. Fixed the problem of corrupted system parameter sector due to frequent power-on / power-off.
15. Other bugs.
RTOS SDK V1.5.0 2016.11.11
ESP8266 RTOS SDK V2.0.0

Click the download icon on the right to get release notes in detail and download the SDK of the latest version.

RTOS SDK V2.0.0 2018.04.02
ESP8266 RTOS SDK v1.4.0


1. Update boot.bin to v1.5;

2. Add wifi_station_set/get_hostname API;

3. Update SmartConfig to version 2.5.3;

4. Support GPIO wakeup;

5. Enable IGMP in LWIP;

6. Add espconn_init in espconn.h;

7. Update esp_init_data_default.bin;

8. IROM start address changed to 0x20000.

RTOS SDK V1.4.0 2016.02.26
ESP8266 RTOS SDK (IDF Style)

ESP8266 RTOS SDK in ESP-IDF style.

RTOS SDK V3.1.1 2020.03.24
ESP8266 RTOS SDK v1.3.3 Patch_20160704

This patch is based on the ESP8266_RTOS_SDK_V1.3.0(68c9e7b4) and contains all changes updated within ESP8266_RTOS_SDK_V1.3.1(095c975c) and ESP8266_RTOS_SDK_V1.3.2(86e315aa). When this patch is used, .a files in this patch shall replace corresponding files under the SDK/lib Folder.


1. Fix station leave issue in softap mode.(Resolved in ESP8266_RTOS_SDK_V1.3.1)
2. 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_RTOS_SDK_V1.3.2) 
3. Fix a potential risk that will cause rf not work after external reset.(Resolved in ESP8266_RTOS_SDK_V1.3.3)
4. Modify 112 byte of esp_init_data_default.bin, 0x03->0x00, turn off auto freq correction.(Resolved in ESP8266_RTOS_SDK_V1.3.3)
Attention: Please refer to “user_main.c” in the zip for “user_rf_cal_sector_set” sample code.

ESP8266_RTOS_SDK Note:

1. esp_init_data.bin has to be downloaded into flash at least once.
2. Download blank.bin to initialize the sector stored RF_CAL parameter (set by user_rf_cal_sector_set), and download esp_init_data.bin into flash, when the system needs to be initialized, or RF needs to be calibrated again.
RTOS SDK V1.3.3 2016.07.04

More information on GitHub

Development projects are freely distributed under Espressif's MIT license on GitHub.