/*--------------------------------------------------
HTTP 1.1 Webserver for ESP8266 
for ESP8266 adapted Arduino IDE
http://www.esp8266.com/viewtopic.php?p=65572
--------------------------------------------------*/
#include 
const char* ssid     = "FREE";
const char* password = "WIFI";
int ledState = false;
unsigned long ulReqcount;
unsigned long ulReconncount;
byte relON[] = {0xA0, 0x01, 0x01, 0xA2};  //Hex command to send to serial for open relay
byte relOFF[] = {0xA0, 0x01, 0x00, 0xA1}; //Hex command to send to serial for close relay
// Create an instance of the server on Port 80
WiFiServer server(80);
void setup() 
{
  // setup globals
  ulReqcount=0; 
  ulReconncount=0;
  // start serial
  Serial.begin(9600);
  delay(1);
  // inital connect
  WiFi.mode(WIFI_STA);
  WiFiStart();
}
void WiFiStart()
{
  ulReconncount++;
  // Connect to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  // Start the server
  server.begin();
  Serial.println("Server started");
  // Print the IP address
  Serial.println(WiFi.localIP());
}
void loop() 
{
  // check if WLAN is connected
  if (WiFi.status() != WL_CONNECTED)
  {
    WiFiStart();
  }
  // Check if a client has connected
  WiFiClient client = server.available();
  if (!client) 
  {
    return;
  }
  
  // Wait until the client sends some data
  Serial.println("new client");
  unsigned long ultimeout = millis()+250;
  while(!client.available() && (millis()ultimeout) 
  { 
    Serial.println("client connection time-out!");
    return; 
  }
  // Read the first line of the request
  String sRequest = client.readStringUntil('\r');
  //Serial.println(sRequest);
  client.flush();
  
  // stop client, if request is empty
  if(sRequest=="")
  {
    Serial.println("empty request! - stopping client");
    client.stop();
    return;
  }
  // get path; end of path is either space or ?
  // Syntax is e.g. GET /?pin=MOTOR1STOP HTTP/1.1
  String sPath="",sParam="", sCmd="";
  String sGetstart="GET ";
  int iStart,iEndSpace,iEndQuest;
  iStart = sRequest.indexOf(sGetstart);
  if (iStart>=0)
  {
    iStart+=+sGetstart.length();
    iEndSpace = sRequest.indexOf(" ",iStart);
    iEndQuest = sRequest.indexOf("?",iStart);
    // are there parameters?
    if(iEndSpace>0)
    {
      if(iEndQuest>0)
      {
        // there are parameters
        sPath  = sRequest.substring(iStart,iEndQuest);
        sParam = sRequest.substring(iEndQuest,iEndSpace);
      }
      else
      {
        // NO parameters
        sPath  = sRequest.substring(iStart,iEndSpace);
      }
    }
  }
  ///////////////////////////////////////////////////////////////////////////////
  // output parameters to serial, you may connect e.g. an Arduino and react on it
  ///////////////////////////////////////////////////////////////////////////////
  if(sParam.length()>0)
  {
    int iEqu=sParam.indexOf("=");
    if(iEqu>=0)
    {
      sCmd = sParam.substring(iEqu+1,sParam.length());
      Serial.println(sCmd);
    }
  }
  ///////////////////////////
  // format the html response
  ///////////////////////////
  String sResponse,sHeader;
  
  ////////////////////////////
  // 404 for non-matching path
  ////////////////////////////
  if(sPath!="/")
  {
    sResponse="
Not Found
The requested URL was not found on this server.
";
    
    sHeader  = "HTTP/1.1 404 Not found\r\n";
    sHeader += "Content-Length: ";
    sHeader += sResponse.length();
    sHeader += "\r\n";
    sHeader += "Content-Type: text/html\r\n";
    sHeader += "Connection: close\r\n";
    sHeader += "\r\n";
  }
  ///////////////////////
  // format the html page
  ///////////////////////
  else
  {
    ulReqcount++;
    sResponse  = "";
    sResponse += "";
    sResponse += "";
    sResponse += "
Demo pour ESP8266 version ESP-01
";
    sResponse += "Allumez en cliquant sur le bouton.
";
    sResponse += "";
    sResponse += "
Funktion 1 Allumer Eteindre
";
    //////////////////////
    // react on parameters
    //////////////////////
    if (sCmd.length()>0)
    {
      // write received command to html page
      sResponse += "Kommando:" + sCmd + "
";
      // switch GPIO
      if(sCmd.indexOf("FUNCTION1ON")>=0)
      {
      Serial.write(relON, sizeof(relON));     // turns the relay ON
      ledState = false;
      }
      else if(sCmd.indexOf("FUNCTION1OFF")>=0)
      {
      Serial.write(relOFF, sizeof(relOFF));   // turns the relay OFF
      ledState = true;
      }
    }
    sResponse += "";
    sResponse += "
Aufrufzähler="; 
    sResponse += ulReqcount;
    sResponse += " - Verbindungszähler="; 
    sResponse += ulReconncount;
    sResponse += "
";
    sResponse += "";
    sHeader  = "HTTP/1.1 200 OK\r\n";
    sHeader += "Content-Length: ";
    sHeader += sResponse.length();
    sHeader += "\r\n";
    sHeader += "Content-Type: text/html\r\n";
    sHeader += "Connection: close\r\n";
    sHeader += "\r\n";
  }
  // Send the response to the client
  client.print(sHeader);
  client.print(sResponse);
  // and stop the client
  client.stop();
  Serial.println("Client disonnected");
}
/*
test a faire
#define RX_PIN 3   // GPIO3
#define TX_PIN 1   // GPIO1

void setup() {
// dont Serial.begin(74880)!!!!!!!!!!!!!!!!!!!
  pinMode(RX_PIN, INPUT);    
  pinMode(TX_PIN, INPUT);   
}
*/