--- title: "ESP_AT_WM_Lite" url: "https://maker.wiznet.io/viktor/projects/esp-at-wm-lite/" markdown_url: "https://maker.wiznet.io/viktor/projects/esp-at-wm-lite/md" type: "UCC: User Created Content" author: "Khoi Hoang" author_url: "https://github.com/khoih-prog/ESP_AT_WM_Lite" editor: "WIZnet" editor_url: "https://maker.wiznet.io/" original_author: "Khoi Hoang" original_url: "https://github.com/khoih-prog/ESP_AT_WM_Lite" published: "2023-01-19" language: "en" likes: 14 views: 550 comments: 2 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # ESP_AT_WM_Lite > Light-Weight WiFi/Credentials Manager for STM32, RP2040-based RASPBERRY_PI_PICO, etc. boards running WizFi360ESP8266/ESP32-AT-command shield Original author: Khoi Hoang (source: https://github.com/khoih-prog/ESP_AT_WM_Lite) ## Article ### Why do we need this [ESP_AT_WM_Lite library](https://github.com/khoih-prog/ESP_AT_WM_Lite) #### Features This library is a Light Weight Credentials / WiFi Manager for ESP8266/ESP32-AT shields, specially designed to support **AVR Mega, SAM DUE, SAMD21, SAMD51, nRF52, STM32F/L/H/G/WB/MP1, etc. boards running ESP8266/ESP32-AT-command shields.** with smaller memory (64+K bytes) The **RP2040-based boards, such as Nano_RP1040_Connect, RASPBERRY_PI_PICO**, are currently supported using [**Earle Philhower's arduino-pico** core](https://github.com/earlephilhower/arduino-pico) or [**Arduino-mbed RP2040** core](https://github.com/arduino/ArduinoCore-mbed) with Blynk/WiFiManager features thanks to **LittleFS** support. Other AVR-family boards (UNO, Nano, etc.) are **not supported** as they don't have enough memory to run Config Portal WebServer. This [ESP_AT_WM_Lite library](https://github.com/khoih-prog/ESP_AT_WM_Lite) is a Credentials / WiFi Connection Manager, permitting the addition of custom parameters to be configured in Config Portal. The parameters then will be saved automatically, **without the complicated callback functions** to handle data saving / retrieving. If you have used one of the full-fledge WiFiManagers such as : 1. [`Tzapu WiFiManager`](https://github.com/tzapu/WiFiManager) 2. [`Ken Taylor WiFiManager`](https://github.com/kentaylor/WiFiManager) 3. [`Khoi Hoang ESP_WiFiManager`](https://github.com/khoih-prog/ESP_WiFiManager) and have to write **complicated callback functions** to save custom parameters in SPIFFS/LittleFS/EEPROM, you'd appreciate the simplicity of this Light-Weight Credentials / WiFiManager. You can also specify static AP and STA IP. Use much less memory compared to full-fledge WiFiManager. Config Portal will be auto-adjusted to match the number of dynamic custom parameters. Credentials are saved in EEPROM, [`FlashStorage_SAMD`](https://github.com/khoih-prog/FlashStorage_SAMD), [`FlashStorage_STM32`](https://github.com/khoih-prog/FlashStorage_STM32), [`DueFlashStorage`](https://github.com/sebnil/DueFlashStorage) or nRF52 LittleFS. The web configuration portal, served from the `ESP32/ESP8266-AT WiFi` is operating as an access point (AP) with configurable static IP address or use default IP Address of 192.168.4.1 New recent features: - **MultiWiFi** feature for configuring/auto(re)connecting **ESP32/ESP8266-AT WiFi** to the available MultiWiFi APs at runtime. - **DoubleDetectDetector** feature to force Config Portal when double reset is detected within predetermined time, default 10s. - **Powerful-yet-simple-to-use feature to enable adding dynamic custom parameters** from sketch and input using the same Config Portal. Config Portal will be auto-adjusted to match the number of dynamic parameters. - Optional default **Credentials as well as Dynamic parameters to be optionally autoloaded into Config Portal** to use or change instead of manually input. - Dynamic custom parameters to be saved **automatically in non-volatile memory, such as EEPROM, FlashStorage_SAMD, FlashStorage_STM32, DueFlashStorage or nRF52 LittleFS.**. - Configurable **Config Portal Title** to be either BoardName or default undistinguishable names. - Examples are designed to separate Credentials / Defines / Dynamic Params / Code, so that you can change Credentials / Dynamic Params quickly for each device. - To permit autoreset after configurable timeout if DRD/MRD or non-persistent forced-CP - Use new nRF52 LittleFS, SAMD FlashStorage_SAMD and STM32F/L/H/G/WB/MP1 FlashStorage_STM32 features - **Scan WiFi networks** for selection in Configuration Portal #### Currently Supported Boards This [**ESP_AT_WM_Lite** library](https://github.com/khoih-prog/ESP_AT_WM_Lite) currently supports these following boards: **nRF52 boards**, such as **AdaFruit Feather nRF52832, nRF52840 Express, BlueFruit Sense, Itsy-Bitsy nRF52840 Express, Metro nRF52840 Express, NINA_B302_ublox, NINA_B112_ublox, etc.SAM DUESAMD21** - Arduino SAMD21: ZERO, MKRs, NANO_33_IOT, etc. - Adafruit SAMD21 (M0): ItsyBitsy M0, Feather M0, Feather M0 Express, Metro M0 Express, Circuit Playground Express, Trinket M0, PIRkey, Hallowing M0, Crickit M0, etc. - Seeeduino: LoRaWAN, Zero, Femto M0, XIAO M0, Wio GPS Board, etc. 1. **SAMD51** - Adafruit SAMD51 (M4): Metro M4, Grand Central M4, ItsyBitsy M4, Feather M4 Express, Trellis M4, Metro M4 AirLift Lite, MONSTER M4SK Express, Hallowing M4, etc. - Seeeduino: Wio Terminal, Grove UI Wireless **Teensy (4.1, 4.0, 3.6, 3.5, 3,2, 3.1, 3.0, LC)STM32F/L/H/G/WB/MP1 boards (with 64+K Flash)** - Nucleo-144 - Nucleo-64 - Discovery - Generic STM32F0, STM32F1, STM32F2, STM32F3, STM32F4, STM32F7 (with 64+K Flash): x8 and up - STM32L0, STM32L1, STM32L4, **STM32L5** - STM32G0, STM32G4 - STM32H7 - STM32WB - STM32MP1 - LoRa boards - 3-D printer boards - Generic Flight Controllers - Midatronics boards RP2040-based boards, such as **Nano RP2040 Connect**, using [**Arduino mbed OS for Nano boards**](https://github.com/arduino/ArduinoCore-mbed). RP2040-based boards, such as **RASPBERRY_PI_PICO, ADAFRUIT_FEATHER_RP2040 and GENERIC_RP2040**, using [**Arduino-mbed RP2040** core](https://github.com/arduino/ArduinoCore-mbed) or [**Earle Philhower's arduino-pico** core](https://github.com/earlephilhower/arduino-pico). **WIZNET_WIZFI360_EVB_PICO** using [**Earle Philhower's arduino-pico** core](https://github.com/earlephilhower/arduino-pico) --- Source: https://maker.wiznet.io/viktor/projects/esp-at-wm-lite/