/*
  WriteSingleField
  
  Description: Writes a value to a channel on ThingSpeak every 20 seconds.
  
  Hardware: ESP32 based boards
   
  Note:
  - Requires installation of EPS32 core. See https://github.com/espressif/arduino-esp32/blob/master/docs/arduino-ide/boards_manager.md for details. 
  - Select the target hardware from the Tools->Board menu
  - This example is written for a network using WPA encryption. For WEP or WPA, change the WiFi.begin() call accordingly.
  
  ThingSpeak ( https://www.thingspeak.com ) is an analytic IoT platform service that allows you to aggregate, visualize, and 
  analyze live data streams in the cloud. Visit https://www.thingspeak.com to sign up for a free account and create a channel.  
  
  Documentation for the ThingSpeak Communication Library for Arduino is in the README.md folder where the library was installed.
  See https://www.mathworks.com/help/thingspeak/index.html for the full ThingSpeak documentation.
  
  For licensing information, see the accompanying license file.
  
  Copyright 2018, The MathWorks, Inc.
*/

#include "ThingSpeak.h"
#include "secrets.h"
#include 

char ssid[] = SECRET_SSID;   // your network SSID (name) 
char pass[] = SECRET_PASS;   // your network password
int keyIndex = 0;            // your network key Index number (needed only for WEP)
WiFiClient  client;

unsigned long myChannelNumber = SECRET_CH_ID;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;

int number = 0;

void setup() {
  Serial.begin(115200);  //Initialize serial

  WiFi.mode(WIFI_STA);   
  ThingSpeak.begin(client);  // Initialize ThingSpeak
}

void loop() {

  // Connect or reconnect to WiFi
  if(WiFi.status() != WL_CONNECTED){
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while(WiFi.status() != WL_CONNECTED){
      WiFi.begin(ssid, pass); // Connect to WPA/WPA2 network. Change this line if using open or WEP network
      Serial.print(".");
      delay(20000);     
    } 
    Serial.println("\nConnected.");
  }

  number = analogRead(36);
  int x = ThingSpeak.writeField(myChannelNumber, 1, number, myWriteAPIKey);
  if(x == 200){
    Serial.println("Channel update successful.");
  }
  else{
    Serial.println("Problem updating channel. HTTP error code " + String(x));
  }
  
   
  delay(20000); // Wait 20 seconds to update the channel again
}

// Use this file to store all of the private credentials 
// and connection details

#define SECRET_SSID "Tel gaspard"		// replace MySSID with your WiFi network name
#define SECRET_PASS "12345678"	// replace MyPassword with your WiFi password

#define SECRET_CH_ID 1281249			// replace 0000000 with your channel number
#define SECRET_WRITE_APIKEY "095DAVCP2L62E1KG"   // replace XYZ with your channel write API Key

% Store the channel ID for the sensor channel.
channelID = 1281249;

% Provide the ThingSpeak alerts API key.  All alerts API keys start with TAK.
alertApiKey = 'TAKJ0ZPEPG8UU1D5N3PWR';

% Set the address for the HTTTP call
alertUrl="https://api.thingspeak.com/alerts/send";

% webwrite uses weboptions to add required headers.  Alerts needs a ThingSpeak-Alerts-API-Key header.
options = weboptions("HeaderFields", ["ThingSpeak-Alerts-API-Key", alertApiKey ]);

% Set the email subject.
alertSubject = sprintf("warning dude!");

% Read the recent data.
lightData = thingSpeakRead(channelID,'ReadKey','9XCFL555DGOYUBX3','NumDays',30,'Fields',1);

% Check to make sure the data was read correctly from the channel.
if isempty(lightData)
    alertBody = ' No data read . ';      
else
    
    % Get the most recent point in the array of moisture data.
    lastValue = lightData(end); 
    disp(lastValue)

    % Set the outgoing message
    if (lastValue<=2000)
        alertBody = ' it s geeting dark! ';
    else
        alertBody = ' its ok. ';
    end
end
 
 % Catch errors so the MATLAB code does not disable a TimeControl if it fails
try
    webwrite(alertUrl , "body", alertBody, "subject", alertSubject, options);
catch someException
    fprintf("Failed to send alert: %s\n", someException.message);
end