examples/PostServer/PostServer.ino

/****************************************************************************************************************************
  PostServer.h - Simple Arduino web server sample for SAMD21 running WiFiNINA shield
  For any WiFi shields, such as WiFiNINA W101, W102, W13x, or custom, such as ESP8266/ESP32-AT, Ethernet, etc

  WiFiWebServer is a library for the ESP32-based WiFi shields to run WebServer
  Based on and modified from ESP8266 https://github.com/esp8266/Arduino/releases
  Based on  and modified from Arduino WiFiNINA library https://www.arduino.cc/en/Reference/WiFiNINA
  Built by Khoi Hoang https://github.com/khoih-prog/WiFiWebServer
  Licensed under MIT license
 ***************************************************************************************************************************************/

#include "defines.h"

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

WiFiWebServer server(80);

#if defined(LED_BUILTIN)
  const int led =  LED_BUILTIN;
#else
  #if (ESP32)
    // Using pin 13 will crash ESP32_C3
    const int led =  2;
  #else
    const int led =  13;
  #endif
#endif

const String postForms =
  ("<html>\
<head>\
<title>WiFiNINA_WebServer POST handling</title>\
<style>\
body { background-color: #cccccc; font-family: Arial, Helvetica, Sans-Serif; Color: #000088; }\
</style>\
</head>\
<body>\
<h1>POST plain text to /postplain/</h1><br>\
<form method=\"post\" enctype=\"text/plain\" action=\"/postplain/\">\
<input type=\"text\" name=\'{\"hello\": \"world\", \"trash\": \"\' value=\'\"}\'><br>\
<input type=\"submit\" value=\"Submit\">\
</form>\
<h1>POST form data to /postform/</h1><br>\
<form method=\"post\" enctype=\"application/x-www-form-urlencoded\" action=\"/postform/\">\
<input type=\"text\" name=\"hello\" value=\"world\"><br>\
<input type=\"submit\" value=\"Submit\">\
</form>\
</body>\
</html>");

void handleRoot()
{
  digitalWrite(led, 1);
  server.send(200, F("text/html"), postForms);
  digitalWrite(led, 0);
}

void handlePlain()
{
  if (server.method() != HTTP_POST)
  {
    digitalWrite(led, 1);
    server.send(405, F("text/plain"), F("Method Not Allowed"));
    digitalWrite(led, 0);
  }
  else
  {
    digitalWrite(led, 1);
    server.send(200, F("text/plain"), "POST body was:\n" + server.arg("plain"));
    digitalWrite(led, 0);
  }
}

void handleForm()
{
  if (server.method() != HTTP_POST)
  {
    digitalWrite(led, 1);
    server.send(405, F("text/plain"), F("Method Not Allowed"));
    digitalWrite(led, 0);
  }
  else
  {
    digitalWrite(led, 1);

    String message = F("POST form was:\n");

    for (uint8_t i = 0; i < server.args(); i++)
    {
      message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
    }

    server.send(200, F("text/plain"), message);

    digitalWrite(led, 0);
  }
}

void handleNotFound()
{
  digitalWrite(led, 1);

  String message = F("File Not Found\n\n");

  message += F("URI: ");
  message += server.uri();
  message += F("\nMethod: ");
  message += (server.method() == HTTP_GET) ? F("GET") : F("POST");
  message += F("\nArguments: ");
  message += server.args();
  message += F("\n");

  for (uint8_t i = 0; i < server.args(); i++)
  {
    message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
  }

  server.send(404, F("text/plain"), message);

  digitalWrite(led, 0);
}

void setup()
{
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);

  Serial.begin(115200);

  while (!Serial && millis() < 5000);

  Serial.print(F("\nStarting PostServer on "));
  Serial.print(BOARD_NAME);
  Serial.print(F(" with "));
  Serial.println(SHIELD_TYPE);
  Serial.println(WIFI_WEBSERVER_VERSION);

#if WIFI_USING_ESP_AT

  // initialize serial for ESP module
  EspSerial.begin(115200);
  // initialize ESP module
  WiFi.init(&EspSerial);

  Serial.println(F("WiFi shield init done"));

#endif

#if !(ESP32 || ESP8266)

  // check for the presence of the shield
#if USE_WIFI_NINA

  if (WiFi.status() == WL_NO_MODULE)
#else
  if (WiFi.status() == WL_NO_SHIELD)
#endif
  {
    Serial.println(F("WiFi shield not present"));

    // don't continue
    while (true);
  }

#if USE_WIFI_NINA
  String fv = WiFi.firmwareVersion();

  if (fv < WIFI_FIRMWARE_LATEST_VERSION)
  {
    Serial.println(F("Please upgrade the firmware"));
  }

#endif

#endif

  Serial.print(F("Connecting to SSID: "));
  Serial.println(ssid);

  status = WiFi.begin(ssid, pass);

  delay(1000);

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED)
  {
    delay(500);

    // Connect to WPA/WPA2 network
    status = WiFi.status();
  }

  server.on(F("/"), handleRoot);

  server.on(F("/postplain/"), handlePlain);

  server.on(F("/postform/"), handleForm);

  server.onNotFound(handleNotFound);

  server.begin();

  Serial.print(F("HTTP server started @ "));
  Serial.println(WiFi.localIP());
}

void loop()
{
  server.handleClient();
}