// Water Softener Salt Level Monitor

#include "Adafruit_VL53L0X.h"
Adafruit_VL53L0X lox = Adafruit_VL53L0X();
#include <ESP8266WiFi.h>

// Network information.
#define WIFI_NAME "Your ssid"
#define PASSWORD "Your password"

IPAddress ip(192,168,1,150);          // Choose your ip address
IPAddress gateway(192,168,1,254);     // Your gateway
IPAddress subnet(255,255,255,0);
IPAddress dns(192,168,1,254);         // Same as your gateway

// Hardware information.
#define TIMEOUT  5000                              // Timeout for server response.

// ThingSpeak information.

#define THING_SPEAK_ADDRESS "api.thingspeak.com"
String writeAPIKey="Your API key";             // Change this to the write API key for your channel.
                         
WiFiClient client;

// Put your setup code here, to run once:
void setup()
{  
    Serial.begin( 74880 ); // You may need to adjust the speed depending on your hardware.
    lox.begin();

    connectWifi();
}
void loop() {
      
          HTTPPost();
    
    delay( 1000 );
    Serial.println( "Goodnight for an hour ");
   ESP.deepSleep( 4200000000ULL );        // unsigned 32 bit integer in microseconds

delay(100);
    
    // If you disable sleep mode, add delay so you don't post to ThingSpeak too often.
    //   delay( 20000 );
}


// Connect to the local Wi-Fi network
int connectWifi()
{
WiFi.mode(WIFI_STA);      
WiFi.persistent(false);        // Turn off confusing helful features
WiFi.setAutoConnect(false);
WiFi.setAutoReconnect(false);

WiFi.config(ip, gateway, subnet, dns);
WiFi.begin( WIFI_NAME , PASSWORD ); 
 delay(1000);                  // Optimise for minimum value to connect   
}
    
// This function builds the data string for posting to ThingSpeak
  
int HTTPPost(){
VL53L0X_RangingMeasurementData_t measure; 
   lox.rangingTest(&measure, false);
  
    if (client.connect( THING_SPEAK_ADDRESS , 80 )){

       // Build the postData string.  
       String postData= "api_key=" + writeAPIKey ;

   postData += "&field1=";
    postData += String(measure.RangeMilliMeter);
    postData += "&field2=";
    postData += String(WiFi.RSSI());

        // POST data via HTTP.
        Serial.println( "Connecting to ThingSpeak for update..." );
        Serial.println();
        
        client.println( "POST /update HTTP/1.1" );
        client.println( "Host: api.thingspeak.com" );
        client.println( "Connection: close" );
        client.println( "Content-Type: application/x-www-form-urlencoded" );
        client.println( "Content-Length: " + String( postData.length() ) );
        client.println();
        client.println( postData );
        
        Serial.println( postData );
        
        String answer=getResponse();
        Serial.println( answer );

        Serial.println(WiFi.RSSI());
Serial.println(measure.RangeMilliMeter);
         
    }
    else
    {
      Serial.println ( "Connection Failed" );
    }    
}
// Collect the response and build it into a string.
String getResponse(){
  String response;

  long startTime = millis();

  delay( 200 );
  while ( client.available() < 1 && (( millis() - startTime ) < TIMEOUT ) ){
        delay( 5 );
  }
  if( client.available() > 0 ){ // Get response from server.
     char charIn;
     do {
         charIn = client.read(); // Read a char from the buffer.
         response += charIn;     // Append the char to the string response.
        } while ( client.available() > 0 );
    }
  client.stop();
          return response;
}