/* NB! - this is the Sonoff device with no radio remote control components
*
* This sketch demonstrates how to set up a simple HTTP-like server.
* The server will set GPIO pins depending on the request
*
* NB! modified for fixed WIFI address
*
sonoff header
1 - vcc 3v3
2 - rx
3 - tx
4 - gnd
5 - gpio 14
esp8266 connections
gpio 0 - button
gpio 12 - relay
gpio 13 - green led - active low
gpio 14 - connect via 1 kohm to the red led in the two colour led
(the bare led wire nearest the antenna end of the board)
*/

#include <ESP8266WiFi.h>

// from a terminal or bash script send one of -
// curl "http://192.168.0.104/(00)/" //gpio12relay off (pin low)
// curl "http://192.168.0.104/(01)/" //gpio12relay on (pin high)
// curl "http://192.168.0.104/(20)/" //gpio13greenled on (pin low)
// curl "http://192.168.0.104/(21)/" //gpio13greenled off (pin high)
// curl "http://192.168.0.104/(30)/" //gpio14redled on (pin low)
// curl "http://192.168.0.104/(31)/" //gpio14redled off (pin high)
// - or just place http://192.168.0.104/(00)/ in the address box of a browser
// - Lines below like "if (req.indexOf("(01)") != -1)" could detect more descriptive texts)

const char* ssid = "my WIFI SSID";
const char* password = "my password";
int gpio12relay_pin = 12;
int gpio13greenled_pin = 13;
int gpio14redled_pin = 14;
int val0 = 0;
int val2 = 0;
int val3 = 0;
int old_val0 = 0;
int old_val2 = 0;
int old_val3 = 0;

//'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' for Interrupt
volatile int state = LOW; // so we can toggle the relay
const byte BUTTON = 0; // push the button (on GPIO 0) to toggle the relay

// Interrupt Service Routine (ISR)
void switchPressed ()
{
state = !state;
digitalWrite (gpio12relay_pin, state);
}
//''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

// Create an instance of the server
// specify the port to listen on as an argument
WiFiServer server(80);
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++ setup start
void setup() {
Serial.begin(115200);
delay(10);

// prepare GPIO12
pinMode(gpio12relay_pin, OUTPUT);
digitalWrite(gpio12relay_pin, 0);

// prepare GPIO13
pinMode(gpio13greenled_pin, OUTPUT);
digitalWrite(gpio13greenled_pin, 0);

// prepare GPIO14
pinMode(gpio14redled_pin, OUTPUT);
digitalWrite(gpio14redled_pin, 0);

//'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' for Interrupt
digitalWrite (BUTTON, HIGH); // internal pull-up resistor
attachInterrupt (digitalPinToInterrupt (BUTTON), switchPressed, FALLING); // attach interrupt handler
//''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

// 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");

// config static IP
IPAddress ip(192, 168, 0, xxx); // the desired IPAddress
IPAddress gateway(192, 168, 0, xxx); // set gateway to match your network
Serial.print(F("Setting static ip to : "));
Serial.println(ip);
IPAddress subnet(255, 255, 255, 0); // set subnet mask to match your network
WiFi.config(ip, gateway, subnet);

// Print the IP address
//Serial.println(WiFi.localIP());
}
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++ setup end

//======================================================== loop start
void loop() {
// Check if a client has connected
WiFiClient client = server.available();
if (!client) {
return;
}

// Wait until the client sends some data
Serial.println("new client");
while(!client.available()){
delay(1);
}

// Read the first line of the request
String req = client.readStringUntil('\r');
Serial.println(req);
client.flush();

// Match the request
// first digit is led/relay code number second digit is state requested

if (req.indexOf("(00)") != -1) //not equal to -1 means it was present
{val0 = 0; val2 = old_val2; val3 = old_val3;} // gpio12relay turns off, gpio13greenled does not change, gpio14redled_pin does not change
if (req.indexOf("(01)") != -1)
{val0 = 1; val2 = old_val2; val3 = old_val3;} // gpio12relay turns on, gpio13greenled does not change, gpio14redled_pin does not change

if (req.indexOf("(20)") != -1)
{val0 = old_val0; val2 = 0; val3 = old_val3;} // gpio12relay does not change, gpio13greenled turns off, gpio14redled_pin does not change
if (req.indexOf("(21)") != -1)
{val0 = old_val0; val2 = 1; val3 = old_val3;} // gpio12relay does not change, gpio13greenled turns on, gpio14redled_pin does not change

if (req.indexOf("(30)") != -1)
{val0 = old_val0; val2 = old_val2; val3 = 0;} // gpio12relay does not change, gpio13greenled does not change, gpio14redled_pin turns off
if (req.indexOf("(31)") != -1)
{val0 = old_val0; val2 = old_val2; val3 = 1;} // gpio12relay does not change, gpio13greenled does not change, gpio14redled_pin turns on

Serial.print("old_val0 = "); Serial.println(old_val0);
Serial.print("old_val2 = "); Serial.println(old_val2);
Serial.print("val0 = "); Serial.println(val0);
Serial.print("val2 = "); Serial.println(val2);

old_val0 = val0; // relay
old_val2 = val2; // green led
old_val3 = val3; // red led

//else {
//Serial.println("invalid request");
//client.stop();
//return;
//}

if (val0 == 1)
{ state = HIGH; }
else
{ state = LOW; } // a button press will toggle this value

// Set GPIO according to the request
digitalWrite(gpio12relay_pin, state);
digitalWrite(gpio13greenled_pin, val2);
digitalWrite(gpio14redled_pin, val3);

client.flush();

// Prepare the response
String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nThe power relay is now ";
s += (val0)?"on":"off";
s += "<BR>";

// Send the response to the client
// just a test - build a decent web page with buttons etc here
client.print(s);

if (val2 == 0) { client.print("the green LED is on <BR>");}
else { client.print("the green LED is off <BR>");}

if (val3 == 0) { client.print("the red LED is on <BR>");}
else { client.print("the red LED is off <BR></html>");}

delay(1);
Serial.println("Client disonnected");

// The client will actually be disconnected
// when the function returns and 'client' object is destroyed
}
//=================================================== loop end