ardREST

m83_ardREST.pde

/*
  A REST-style interface for the Arduino Ethernet Board.
  Based on RESTduino: https://github.com/jjg/RESTduino

Adapted for the Arduino Ethernet Board
by Marcel Hauri | http://m83.ch | twitter.com/mhauri
*/


  #include <SPI.h>
  #include <Ethernet.h>

  byte mac[] = {0x90, 0xA2, 0xDA, 0x00, 0xEE, 0xAB};
  byte ip[] = {192,168,250,4};

  EthernetServer server(80);

  void setup()
  {
  Ethernet.begin(mac, ip);
  server.begin();
  }

  #define BUFSIZE 255

  void loop()
  {
  char clientline[BUFSIZE];
  int index = 0;

  EthernetClient client = server.available();
  if (client) {

  index = 0;

  while (client.connected()) {
  if (client.available()) {
  char c = client.read();

  if(c != '\n' && c != '\r'){
  clientline[index] = c;
  index++;

  if(index >= BUFSIZE)
  index = BUFSIZE -1;

  continue;
  }

  String urlString = String(clientline);

  String op = urlString.substring(0,urlString.indexOf(' '));

  urlString = urlString.substring(urlString.indexOf('/'), urlString.indexOf(' ', urlString.indexOf('/')));

  urlString.toCharArray(clientline, BUFSIZE);

  char *pin = strtok(clientline,"/");
  char *value = strtok(NULL,"/");

  char outValue[10] = "MU";
  String jsonOut = String();

  if(pin != NULL){
  if(value != NULL){

  int selectedPin = atoi (pin);
  pinMode(selectedPin, OUTPUT);

  if(strncmp(value, "HIGH", 4) == 0 || strncmp(value, "LOW", 3) == 0){

  if(strncmp(value, "HIGH", 4) == 0){

  digitalWrite(selectedPin, HIGH);
  }

  if(strncmp(value, "LOW", 3) == 0){
  digitalWrite(selectedPin, LOW);
  }

  } else {

  int selectedValue = atoi(value);
  analogWrite(selectedPin, selectedValue);

  }

  jsonOut += "{\"";
  jsonOut += pin;
  jsonOut += "\":\"";
  jsonOut += value;
  jsonOut += "\"}";
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("Access-Control-Allow-Origin: *");
  client.println();
  client.println(jsonOut);

  }
  else {

  if(pin[0] == 'a' || pin[0] == 'A'){
  int selectedPin = pin[1] - '0';
  sprintf(outValue,"%d",analogRead(selectedPin));

  }
  else if(pin[0] != NULL) {
  int selectedPin = pin[0] - '0';

  pinMode(selectedPin, INPUT);

  int inValue = digitalRead(selectedPin);

  if(inValue == 0){
  sprintf(outValue,"%s","LOW");
  }

  if(inValue == 1){
  sprintf(outValue,"%s","HIGH");
  }

  }

  jsonOut += "{\"";
  jsonOut += pin;
  jsonOut += "\":\"";
  jsonOut += outValue;
  jsonOut += "\"}";

  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("Access-Control-Allow-Origin: *");
  client.println();
  client.println(jsonOut);
  }
  }
  else {

  //  error
  client.println("HTTP/1.1 404 Not Found");
  client.println("Content-Type: text/html");
  client.println();

  }
  break;
  }
  }

  delay(1);

  client.stop();
  }
  }