# espressif/ESP8266_RTOS_SDK

Latest ESP8266 SDK based on FreeRTOS, esp-idf style.

Repository: https://github.com/espressif/ESP8266_RTOS_SDK
Canonical: https://ross.abutalabs.com/products/esp8266_rtos_sdk
Homepage: http://bbs.espressif.com
Language: C
License: Apache-2.0
License Family: permissive
Last push: 2026-07-08T09:36:07+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 91, release rhythm 8, longevity 100
- inputs: {"age_days": 4289, "days_push": 56, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3563, forks 1623 (observed 2026-08-28T04:08:09.880466+00:00)

## What it is
Espressif's official FreeRTOS-based software development kit for the ESP8266 chip, written in C and following the esp-idf style API. It provides Wi-Fi drivers, peripherals, build tooling, and libraries for developing firmware on ESP8266 microcontrollers.

## Use cases
- build firmware for esp8266 wifi chip
- program esp8266 with freertos
- develop iot devices with esp8266
- flash wifi microcontroller projects in c
- port esp-idf style code to esp8266
- control gpio and wifi on esp8266

## When to choose
- you are developing C firmware for the ESP8266 and want an RTOS-based, esp-idf-style API
- you need official Espressif Wi-Fi and peripheral drivers for ESP8266
- you want FreeRTOS multitasking on the ESP8266

## When to avoid
- you are targeting ESP32 or newer Espressif chips - use esp-idf instead
- you want a beginner-friendly Arduino-style environment
- you need actively developed features - the SDK is in maintenance pending migration to esp-idf

## Facets
- artifact type: library
- maturity: maintenance
- function: sdk, embedded, networking, cryptography, concurrency
- domain: iot, embedded-systems, hardware
- platform: embedded, iot, cross-platform, c
- tags: esp8266, freertos, esp-idf, wifi, espressif, firmware, microcontroller, lwip, mbedtls

## Member repositories
- espressif/ESP8266_RTOS_SDK (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:09.880466+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:22:38.420669+00:00, confidence not recorded.
  - readme: https://github.com/espressif/ESP8266_RTOS_SDK (fetched 2026-08-28T04:08:09.880466+00:00, sha 93bb8965d42b)
  - homepage: http://bbs.espressif.com (fetched 2026-08-29T09:27:58.988445+00:00, sha 951a32930c53)
  - site_page: https://bbs.espressif.com/faq.php (fetched 2026-08-29T09:27:58.991746+00:00, sha 6085582c36f3)
  - site_page: https://bbs.espressif.com/viewforum.php?f=21 (fetched 2026-08-29T09:27:58.994594+00:00, sha df2b2f6ef1d4)
  - site_page: https://bbs.espressif.com/viewforum.php?f=51 (fetched 2026-08-29T09:27:58.996517+00:00, sha 1f4c7ab1ee68)
  - site_page: https://bbs.espressif.com/viewforum.php?f=61 (fetched 2026-08-29T09:27:58.998196+00:00, sha 61a6e75de2a5)
  - site_page: http://www.espressif.com/en/support/explore/faq (fetched 2026-08-29T09:27:59.000285+00:00, sha 700dbcd2e366)
  - site_page: https://bbs.espressif.com/viewforum.php?f=49 (fetched 2026-08-29T09:27:59.002272+00:00, sha c9be48c51dba)
- Data as of 2026-08-30T08:39:29.467469+00:00.