WiFiWebServer library for AVR, Teensy, SAM DUE, SAMD, STM32, etc. boards running WiFi modules/shields (WiFiNINA U-Blox W101, W102, etc.)

Many people, me including, are using Arduino, Teensy, etc. boards with ESP8266 AT-Command shields, which present many problems and limitations, such as small 2K AT-command buffer size, slow speed, unreliability, etc.

The introduction of new and much more powerful dual-cored ESP32-based WiFi/BT/BLE Modules/Shields (such as U-Blox WiFiNINA, W101, W102), has been well received and already implemented and used in Nano-33-IoT, Nano-33-BLE, etc.

However, the library support is still not as complete as that of ESP8266/ESP32.

That’s why we, so far, still haven’t got libraries similar to ESP8266WebServer, WiFiManager for Arduino, Teensy, etc. using this U-Blox WiFiNINA modules/shields.

This is the reason for me to finish this new WiFiWebServer Library. The WiFiNINAManager and BlynkWM_WiFiNINA for boards such as Nano-33-IoT, SAMD21, SAMD51, Teensy, STM32, etc. will be in the to-do list.

This is simple yet complete WebServer library for AVR, Teensy, SAM DUE, SAMD, STM32, etc. boards running WiFi modules/shields (WiFiNINA U-Blox W101, W102, etc.). The functions are similar and compatible to ESP8266/ESP32 WebServer libraries to make life much easier to port sketches from ESP8266/ESP32.

The library currently supports these boards

  1. SAM DUE
  2. SAMD21 (ZERO, MKR, Nano-33-IoT, M0, M0 Pro, AdaFruit CIRCUITPLAYGROUND_EXPRESS, etc.)
  3. SAMD51 (Adafruit M4 : Metro, Grand Central, ItsyBitsy, Feather Express, Trellis, Metro AirLift lite, MONSTER M4SK Express, Hallowing Express, etc. )
  4. Teensy (4.0, 3.6, 3.5, 3,2, 3.1, 3.0, LC)
  5. STM32F1, STM32F2, STM32F4, STM32F7

The library supports

  1. WiFi Client, STA and AP mode
  2. TCP Server and Client
  3. UDP Server and Client
  4. HTTP Server and Client
  5. HTTP GET and POST requests, provides argument parsing, handles one client at a time.

Library is based on and modified from:

  1. Ivan Grokhotkov’s ESP8266WebServer

The WiFiWebServer class found in WiFiWebServer.h header, is a simple web server that knows how to handle HTTP requests such as GET and POST and can only support one simultaneous client.

There are 14 examples:

  1. HelloServer
  2. HelloServer2
  3. AdvancedWebServer
  4. HttpBasicAuth
  5. PostServer
  6. SimpleAuthentication
  7. ConnectWPA
  8. ScanNetworks
  9. UdpNTPClient
  10. WiFiUdpNtpClient
  11. UdpSendReceive
  12. WebClient
  13. WebClientRepeating
  14. WebServer

This is the HelloServer


#define USE_WIFI_NINA         true

#if    ( defined(ARDUINO_SAM_DUE) || defined(ARDUINO_SAMD_ZERO) || defined(ARDUINO_SAMD_MKR1000) || defined(ARDUINO_SAMD_MKRWIFI1010) \
      || defined(ARDUINO_SAMD_NANO_33_IOT) || defined(ARDUINO_SAMD_MKRFox1200) || defined(ARDUINO_SAMD_MKRWAN1300) || defined(ARDUINO_SAMD_MKRWAN1310) \
      || defined(ARDUINO_SAMD_MKRGSM1400) || defined(ARDUINO_SAMD_MKRNB1500) || defined(ARDUINO_SAMD_MKRVIDOR4000) || defined(__SAMD21G18A__) \
      || defined(ARDUINO_SAMD_CIRCUITPLAYGROUND_EXPRESS) || defined(__SAM3X8E__) || defined(__CPU_ARC__) )
#if defined(WIFI_USE_SAMD)
#define WIFI_USE_SAMD      true

#if ( defined(STM32F0) || defined(STM32F1) || defined(STM32F2) || defined(STM32F3)  ||defined(STM32F4) || defined(STM32F7) )
#if defined(WIFI_USE_STM32)
#undef WIFI_USE_STM32
#define WIFI_USE_STM32      true

#if defined(__IMXRT1062__)
#define BOARD_TYPE      "TEENSY 4.0"
#elif ( defined(__MKL26Z64__) || defined(ARDUINO_ARCH_AVR) )
#define BOARD_TYPE      "TEENSY LC or 2.0"
#define BOARD_TYPE      "TEENSY 3.X"

#elif defined(WIFI_USE_SAMD)
#if defined(ARDUINO_SAMD_ZERO)
#define BOARD_TYPE      "SAMD Zero"
#elif defined(ARDUINO_SAMD_MKR1000)
#define BOARD_TYPE      "SAMD MKR1000"
#elif defined(ARDUINO_SAMD_MKRWIFI1010)
#define BOARD_TYPE      "SAMD MKRWIFI1010"
#elif defined(ARDUINO_SAMD_NANO_33_IOT)
#define BOARD_TYPE      "SAMD NANO_33_IOT"
#elif defined(ARDUINO_SAMD_MKRFox1200)
#define BOARD_TYPE      "SAMD MKRFox1200"
#elif ( defined(ARDUINO_SAMD_MKRWAN1300) || defined(ARDUINO_SAMD_MKRWAN1310) )
#define BOARD_TYPE      "SAMD MKRWAN13X0"
#elif defined(ARDUINO_SAMD_MKRGSM1400)
#define BOARD_TYPE      "SAMD MKRGSM1400"
#elif defined(ARDUINO_SAMD_MKRNB1500)
#define BOARD_TYPE      "SAMD MKRNB1500"
#elif defined(ARDUINO_SAMD_MKRVIDOR4000)
#define BOARD_TYPE      "SAMD MKRVIDOR4000"
#elif ( defined(__SAM3X8E__) || (__SAM3X8E__) || (__CPU_ARC__) )
#define BOARD_TYPE      "SAMD Board"
#define BOARD_TYPE      "SAMD Unknown"

#elif defined(WIFI_USE_STM32)
#if defined(STM32F0)
#define BOARD_TYPE  "STM32F0"
#elif defined(STM32F1)
#define BOARD_TYPE  "STM32F1"
#elif defined(STM32F2)
#define BOARD_TYPE  "STM32F2"
#elif defined(STM32F3)
#define BOARD_TYPE  "STM32F3"
#elif defined(STM32F4)
#define BOARD_TYPE  "STM32F4"
#elif defined(STM32F7)
#define BOARD_TYPE  "STM32F7"
#warning STM32 unknown board selected
#define BOARD_TYPE  "STM32 Unknown"
#define BOARD_TYPE      "AVR Mega"

#include <WiFiWebServer.h>

char ssid[] = "****";        // your network SSID (name)
char pass[] = "****";        // your network password

int status = WL_IDLE_STATUS;     // the Wifi radio's status
int reqCount = 0;                // number of requests received

WiFiWebServer server(80);

const int led = 13;

void handleRoot()
  server.send(200, "text/plain", "Hello from WiFiNINA_WebServer!");

void handleNotFound()
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += server.uri();
  message += "\nMethod: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += server.args();
  message += "\n";
  for (uint8_t i = 0; i < server.args(); i++)
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  server.send(404, "text/plain", message);
  digitalWrite(led, 0);

void setup(void)
  // Open serial communications and wait for port to open:
  while (!Serial);

  Serial.println("\nStarting HelloServer on " + String(BOARD_TYPE));

  // check for the presence of the shield
  if (WiFi.status() == WL_NO_MODULE)
    Serial.println(F("WiFi shield not present"));
    // don't continue
    while (true);

  String fv = WiFi.firmwareVersion();
    Serial.println("Please upgrade the firmware");

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
    Serial.print(F("Connecting to WPA SSID: "));
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);


  server.on("/", handleRoot);

  server.on("/inline", []()
    server.send(200, "text/plain", "This works as well");



  Serial.print(F("HTTP server started @ "));

void loop(void)

and the WebBrowser screen when running AdvancedWebServer