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

Beginner friendly Everything

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328 open issues indexed

3.1.2: Possible regression with WiFi-connection after ESP.deepSleep( , RF_DISABLED) Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

esp8266/Arduino#9324 · 1 comment · Opened Aug 27, 2026
ESP-NOW encrypt with ESP32 peer (Arduino 3.x): silent no-recv on SoftAP ESP8266 Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

esp8266/Arduino#9322 · Opened Aug 1, 2026
[compiler Warnings]: Compile with `-Wconversion` and `-Wsign-conversion` brings up many Warnings Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9318 · 5 comments · Opened May 31, 2026
esp8266 smartconfig V2.5.4 Unable to connect to the distribution network with esptouch app Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

esp8266/Arduino#9317 · 1 comment · Opened Apr 16, 2026
[request] add weak attribute in all dummy callback functions Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

esp8266/Arduino#9315 · 2 comments · Opened Apr 6, 2026
Typo in Scan Class Documentation Open

Difficulty 1/5 Under an hour Newbie friendliness 70/100

esp8266/Arduino#9303 · Opened Jan 9, 2026
ESP07-S and ESP12-S modules don't wake from DeepSleep Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9301 · 1 comment · Opened Dec 20, 2025
"LWIP_NO_CTYPE_H" redefined Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

esp8266/Arduino#9294 · 1 comment · Opened Nov 18, 2025
Feature Request: Refactor SPI to allow alternative implementations (e.g., Software SPI) Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

esp8266/Arduino#9293 · Opened Nov 18, 2025
ESP8266HTTPClient does not communicate with ESP8266WebServer Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9292 · Opened Nov 3, 2025
In WString.cpp some of the methods access the insecure version of strcmp and strcnmp Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

esp8266/Arduino#9269 · 4 comments · Opened Aug 19, 2025
Webserver serving very slowly when accessed via softAP but fine via normal route Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

esp8266/Arduino#9260 · 1 comment · Opened Jul 10, 2025
Please add support for the OCTOPUS from Fab-Lab.eu to the boards.txt which is based on the ESP-12F Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

esp8266/Arduino#9229 · Opened Feb 9, 2025
Lack of proper cleanup in ArduinoOTA class (missing end() in ~ArduinoOTA) Open

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

esp8266/Arduino#9228 · 2 comments · Opened Feb 4, 2025
Compilation error - python3.exe: The parameter is incorrect Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9217 · 2 comments · Opened Jan 10, 2025
Empty destructor in WifiServer::~WiFiServer() Open

Difficulty 3/5 1-2 days Newbie friendliness 45/100

esp8266/Arduino#9212 · 1 reaction · Opened Dec 9, 2024
Node CMU 8266 Not running setup or loop after Deep Sleep Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9204 · Opened Nov 3, 2024
Example sketch TickerParameter.ino implementation doesn't match its comments Open

Difficulty 2/5 1-3 hours Newbie friendliness 62/100

esp8266/Arduino#9203 · 1 comment · Opened Oct 31, 2024
ESP8266HTTPClient sets Content-Length even on empty GET-requests Open

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

esp8266/Arduino#9200 · 1 comment · Opened Oct 16, 2024
Feature Request: Don't print stack trace to Serial on crash Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9194 · 3 comments · Opened Aug 28, 2024
Missing eagle.flash.16m.ld Open

component: tools

Difficulty 2/5 1-3 hours Newbie friendliness 35/100

esp8266/Arduino#9187 · 1 comment · Opened Aug 1, 2024
SoftAP appears to default to TKIP. Open

Difficulty 4/5 3-5 days Newbie friendliness 32/100

esp8266/Arduino#9164 · 2 comments · Opened Jul 13, 2024
Releasing Updates Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9161 · 7 comments · 5 reactions · Opened Jul 9, 2024
ESP8266 NodeMCU SD Card Not Initializing Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9156 · 2 comments · Opened Jun 20, 2024
Device is unable to retrieve domain IP after DNS change on router without interrupting the WiFi network Open

Difficulty 4/5 3-5 days Newbie friendliness 28/100

esp8266/Arduino#9138 · 5 comments · Opened May 16, 2024
Meaning of "HTTPServer: error: short send after timeout" Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9124 · 1 comment · Opened Apr 18, 2024
HTTPClient doesn't respect CNAME TTL Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9123 · Opened Apr 12, 2024
Add option to force I2S routines into IRAM Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9115 · 3 comments · Opened Mar 30, 2024
Bug in String::copy, out of bounds crash Open

Difficulty 2/5 1-3 hours Newbie friendliness 48/100

esp8266/Arduino#9110 · 7 comments · Opened Mar 27, 2024
UPLOAD SKETCH ERROR WITH UNO+WiFi R3 ATmega328P+ESP8266 CH340 Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

esp8266/Arduino#9098 · 1 comment · Opened Mar 1, 2024
ESP8266 Crashing! Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

esp8266/Arduino#9097 · 7 comments · Opened Feb 28, 2024
Cannot loop traffic to internal real network interface - not using loopback Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9089 · 1 comment · Opened Feb 13, 2024
ESP8266 Crashing During Prints randomly Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

esp8266/Arduino#9069 · 2 comments · Opened Jan 11, 2024
IPv6 mDNS disabled? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9068 · 4 comments · Opened Jan 10, 2024
Wifi does not reconnect, memory leaks when reconnecting Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9061 · 5 comments · Opened Dec 28, 2023
Debug output says wifi connected, but WiFi.status() keeps returning 7 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9060 · 10 comments · Opened Dec 25, 2023
espconn.h - conflicting declaration of dns_found_callback Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9056 · 1 comment · Opened Dec 19, 2023
Pollution of global namespace due to using namespace EspSoftwareSerial; Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9055 · 10 comments · Opened Dec 17, 2023
Problems connecting to Insecure server while also connecting to a secure mqtt broker (with a certificate) Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9054 · Opened Dec 17, 2023
Data written to EEPROM gets randomly wiped out (rewritten as 0xff) after reset, wake from sleep, or power off/on Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9047 · 13 comments · Opened Dec 6, 2023
mDNS Unable to resolve IP normally in IOS17 Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9046 · 4 comments · Opened Dec 6, 2023
REGRESSION in 3.1.0: http download gets stuck after headers, as if not getting data Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

esp8266/Arduino#9035 · 6 comments · Opened Nov 19, 2023
16KB cache + 48KB IRAM (IRAM) doesn't seem to make extra RAM available Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

esp8266/Arduino#9033 · 15 comments · Opened Nov 17, 2023
Software crashes with an User exception Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

esp8266/Arduino#9029 · 15 comments · Opened Nov 12, 2023
Flash-size agnostic mode, problem with spi_flash_* functions Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

esp8266/Arduino#9027 · 3 comments · Opened Nov 12, 2023
Cannot Connect to Android Phones with version> 10 Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

esp8266/Arduino#9019 · 4 comments · Opened Nov 5, 2023
Disable Ampdu RX/TX Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

esp8266/Arduino#9018 · Opened Nov 5, 2023
How to fix "ets Jan 8 2013,rst cause:2, boot mode:(1,7)" log Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9016 · 1 comment · Opened Nov 3, 2023
mkbuildoptglobals.py UnicodeEncodeError Open

Difficulty 3/5 1-2 days Newbie friendliness 42/100

esp8266/Arduino#9013 · 4 comments · Opened Nov 1, 2023
WEP connection issue Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

esp8266/Arduino#9012 · 3 comments · Opened Nov 1, 2023

esp8266/Arduino

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