examples/Async_PostServer/Async_PostServer.ino

/****************************************************************************************************************************
  Async_PostServer.ino - Dead simple AsyncWebServer for Teensy41 QNEthernet

  For Teensy41 with QNEthernet

  AsyncWebServer_Teensy41 is a library for the Teensy41 with QNEthernet

  Based on and modified from ESPAsyncWebServer (https://github.com/me-no-dev/ESPAsyncWebServer)
  Built by Khoi Hoang https://github.com/khoih-prog/AsyncWebServer_Teensy41
  Licensed under GPLv3 license
 *****************************************************************************************************************************/

#if !( defined(CORE_TEENSY) && defined(__IMXRT1062__) && defined(ARDUINO_TEENSY41) )
  #error Only Teensy 4.1 supported
#endif

// Debug Level from 0 to 4
#define _TEENSY41_ASYNC_TCP_LOGLEVEL_       1
#define _AWS_TEENSY41_LOGLEVEL_             1

#define SHIELD_TYPE     "Teensy4.1 QNEthernet"

#if (_AWS_TEENSY41_LOGLEVEL_ > 3)
  #warning Using QNEthernet lib for Teensy 4.1. Must also use Teensy Packages Patch or error
#endif

#define USING_DHCP            true
//#define USING_DHCP            false

#if !USING_DHCP
  // Set the static IP address to use if the DHCP fails to assign
  IPAddress myIP(192, 168, 2, 222);
  IPAddress myNetmask(255, 255, 255, 0);
  IPAddress myGW(192, 168, 2, 1);
  //IPAddress mydnsServer(192, 168, 2, 1);
  IPAddress mydnsServer(8, 8, 8, 8);
#endif

#include "QNEthernet.h"       // https://github.com/ssilverman/QNEthernet
using namespace qindesign::network;

#include <AsyncWebServer_Teensy41.h>

AsyncWebServer    server(80);

const int led = 13;

const String postForms =
  "<html>\
<head>\
<title>AsyncWebServer 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(AsyncWebServerRequest *request)
{
  digitalWrite(led, 1);
  request->send(200, "text/html", postForms);
  digitalWrite(led, 0);
}

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

void handleForm(AsyncWebServerRequest *request)
{
  if (request->method() != HTTP_POST)
  {
    digitalWrite(led, 1);
    request->send(405, "text/plain", "Method Not Allowed");
    digitalWrite(led, 0);
  }
  else
  {
    digitalWrite(led, 1);
    String message = "POST form was:\n";

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

    request->send(200, "text/plain", message);
    digitalWrite(led, 0);
  }
}

void handleNotFound(AsyncWebServerRequest *request)
{
  digitalWrite(led, 1);
  String message = "File Not Found\n\n";
  message += "URI: ";
  message += request->url();
  message += "\nMethod: ";
  message += (request->method() == HTTP_GET) ? "GET" : "POST";
  message += "\nArguments: ";
  message += request->args();
  message += "\n";

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

  request->send(404, "text/plain", message);
  digitalWrite(led, 0);
}

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

  Serial.begin(115200);

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

  delay(200);

  Serial.print("\nStart Async_PostServer on ");
  Serial.print(BOARD_NAME);
  Serial.print(" with ");
  Serial.println(SHIELD_TYPE);
  Serial.println(ASYNC_WEBSERVER_TEENSY41_VERSION);

  delay(500);

#if USING_DHCP
  // Start the Ethernet connection, using DHCP
  Serial.print("Initialize Ethernet using DHCP => ");
  Ethernet.begin();
#else
  // Start the Ethernet connection, using static IP
  Serial.print("Initialize Ethernet using static IP => ");
  Ethernet.begin(myIP, myNetmask, myGW);
  Ethernet.setDNSServerIP(mydnsServer);
#endif

  if (!Ethernet.waitForLocalIP(5000))
  {
    Serial.println(F("Failed to configure Ethernet"));

    if (!Ethernet.linkStatus())
    {
      Serial.println(F("Ethernet cable is not connected."));
    }

    // Stay here forever
    while (true)
    {
      delay(1);
    }
  }
  else
  {
    Serial.print(F("Connected! IP address:"));
    Serial.println(Ethernet.localIP());
  }

#if USING_DHCP
  delay(1000);
#else
  delay(2000);
#endif

  server.on("/", HTTP_GET, [](AsyncWebServerRequest * request)
  {
    handleRoot(request);
  });

  //server.on("/postplain/", handlePlain);
  server.on("/postplain/", HTTP_POST, [](AsyncWebServerRequest * request)
  {
    handlePlain(request);
  });

  //server.on("/postform/", handleForm);
  server.on("/postform/", HTTP_POST, [](AsyncWebServerRequest * request)
  {
    handleForm(request);
  });

  server.onNotFound(handleNotFound);

  server.begin();

  Serial.print(F("HTTP EthernetWebServer started @ IP : "));
  Serial.println(Ethernet.localIP());
}

void loop()
{
}