esp8266/Arduino

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ESP8266 core for Arduino

Stars: 16.7k
Forks: 13.1k
Open beginner issues: 0
Indexed issues: 328

Dominant language: C++
License: LGPL-2.1
Last GitHub push: Aug 27, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: help wanted
PR merge metrics: No merged PRs in 30d

Open All

328 open issues indexed

Example HelloServer can't connect, but ESP-Link can Open

esp8266/Arduino#7687 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
HTTPClient library only allows Basic authorization Open

waiting for feedback

esp8266/Arduino#7688 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Further transparent integration of compressed updates? Open

component: OTA type: enhancement

esp8266/Arduino#7693 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
WIFI + AVRISP + avrdude: can't upload hex file Open

esp8266/Arduino#7725 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SPISlave.onData never get triggered Open

esp8266/Arduino#7796 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use IPv6 Router Advertisement options for DNS configuration (RFC 8106) Open

component: network type: enhancement waiting for feedback

esp8266/Arduino#7798 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Error in BearSSL when attempting to connect to secure MQTT broker Open

waiting for feedback

esp8266/Arduino#7801 · 22 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ESP8266 lags every 10-15min for a moment - evt: 7 error Open

esp8266/Arduino#7808 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
after auto-reconnection attempts, memory leaks and crashes occur. Exception 29 Open

esp8266/Arduino#7857 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
ESP8266httpUpdate crashing occasionally when using WiFiClientSecure Open

esp8266/Arduino#7858 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
MDNS does not start during setup, if use With ArduinoOTA Open

esp8266/Arduino#7861 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Broken link Online Help in Arduino IDE Open

component: packaging type: bug

esp8266/Arduino#7893 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
twowire i2c library don't work with multiple instance Open

component: core component: libraries type: enhancement

esp8266/Arduino#7894 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Turn-off Broadcast/Multicast Open

esp8266/Arduino#7907 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SPIClient client response messages are shredded and useless, but here is how i fixed it. Open

esp8266/Arduino#7926 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
no more 802.11n connection since 2.6.0 Open

esp8266/Arduino#7965 · 103 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
ESP32 has esp_arduino_version.h now, port this to ESP8266 Open

esp8266/Arduino#7967 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use of busy-wait inside IRAM_ATTR function: core_esp8266_waveform_pwm.cpp Open

esp8266/Arduino#7974 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
WiFi fpm sleep type checks in mode() Open

esp8266/Arduino#7975 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
WifiClient cannot open connection over mobile broadband router? Open

waiting for feedback

esp8266/Arduino#8005 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
suggestion to change parameters of scanNetworks() to match the ones of ESP32 Open

esp8266/Arduino#8053 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem with FastLed since 3.0.0 Open

esp8266/Arduino#8054 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Proxy support for ESP8266HTTPClient Open

waiting for feedback

esp8266/Arduino#8085 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Proxy support request Open

type: enhancement

esp8266/Arduino#8086 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Migrate to ArduinoCore-API Open

esp8266/Arduino#8112 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
abs() macro in Arduino.h inverts signedness of (positive) 0.0F Open

esp8266/Arduino#8115 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Interrupts httpcode returns -1 Open

esp8266/Arduino#8119 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
The lwIP_enc28j60 driver does not handle Rx buffer overflow. Open

type: enhancement

esp8266/Arduino#8123 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Decreased free heap in v3.0.0 Open

esp8266/Arduino#8124 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Watchdog triggered with Adafruit_ST7735 library Open

esp8266/Arduino#8171 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
WiFiClientSecureCtx: hardcoded timeout Open

esp8266/Arduino#8203 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Arduino_Wifi_AVRISP does not work in windows Open

esp8266/Arduino#8209 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SPISlave.h Missing packets and all packets after first 32 byte packet are received incorrectly Open

esp8266/Arduino#8217 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[Question]: return enum WRONG_Password (ESP8266WIFISTA.cpp) Open

esp8266/Arduino#8228 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
WiFI Fails to connect in specific circumstance after deepsleep Open

esp8266/Arduino#8230 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[BUG]: No Return of status `WRONG_PASSWORD` during WiFi Connect Open

esp8266/Arduino#8233 · 17 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
softAPConfig creates IP conflict to devices connected to soft AP Open

esp8266/Arduino#8257 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Can we add an option to disable the F_CPU macro in arduino IDE? Open

component: core

esp8266/Arduino#8272 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Connection to Tesla Powerwall not possible anymore after Powerwall update Open

waiting for feedback

esp8266/Arduino#8279 · 9 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
ESP8266 can't get DHCP IP addres from Asus router Open

esp8266/Arduino#8299 · 37 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
HTTPClient: Split "HTTPC_ERROR_READ_TIMEOUT" up into more detailed error codes Open

component: web type: troubleshooting

esp8266/Arduino#8302 · 20 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Inconsitent meaning of WiFiUDP::flush() across cores. Open

esp8266/Arduino#8312 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
NodeMCU as UDP client to control ws2812 Open

waiting for feedback

esp8266/Arduino#8313 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Strange `std::begin(x)` and `std::end(x)` with c-strings Open

esp8266/Arduino#8314 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[feature request] Webserver: additions Open

type: enhancement

esp8266/Arduino#8349 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Version 3.0.2 fails to link with any sketch. V3.0.1 works fine. Open

esp8266/Arduino#8352 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem on using SPI Extended Mode on NodeMCU connecting an SD Card Module Open

esp8266/Arduino#8359 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
need help with yet another "'Base64_decode' was not declared in this scope" presisting Error. Open

esp8266/Arduino#8399 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Version 3.0.0 up break my92xx library Open

esp8266/Arduino#8400 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Backport getLocalTime from ESP32 Open

esp8266/Arduino#8405 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

esp8266/Arduino

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