Async_SimpleWebServer.ino

/****************************************************************************************************************************
  Async_SimpleWebServer.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
 *****************************************************************************************************************************/

//
// A simple server implementation showing how to:
//  * serve static messages
//  * read GET and POST parameters
//  * handle missing pages / 404s
//

#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 char* PARAM_MESSAGE = "message";

void notFound(AsyncWebServerRequest *request)
{
  request->send(404, "text/plain", "Not found");
}

void setup()
{
  Serial.begin(115200);

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

  Serial.print("\nStart Async_SimpleWebServer 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)
  {
    request->send(200, "text/plain", "Hello, world from Teensy 4.1 and QNEthernet");
  });

  // Send a GET request to <IP>/get?message=<message>
  server.on("/get", HTTP_GET, [] (AsyncWebServerRequest * request)
  {
    String message;

    if (request->hasParam(PARAM_MESSAGE))
    {
      message = request->getParam(PARAM_MESSAGE)->value();
    }
    else
    {
      message = "No message sent";
    }

    request->send(200, "text/plain", "Hello, GET: " + message);
  });

  // Send a POST request to <IP>/post with a form field message set to <message>
  server.on("/post", HTTP_POST, [](AsyncWebServerRequest * request)
  {
    String message;

    if (request->hasParam(PARAM_MESSAGE, true))
    {
      message = request->getParam(PARAM_MESSAGE, true)->value();
    }
    else
    {
      message = "No message sent";
    }

    request->send(200, "text/plain", "Hello, POST: " + message);
  });

  server.onNotFound(notFound);

  server.begin();

  Serial.print("Server started @ ");
  Serial.println(Ethernet.localIP());
}

void loop()
{
}