// Import Wi-Fi library
#include <WiFi.h>
 
//Libraries for LoRa
#include <SPI.h>
#include <LoRa.h>
 
//define the pins used by the LoRa transceiver module
#define ss 5
#define rst 14
#define dio0 2
 
#define BAND 433E6    //433E6 for Asia, 866E6 for Europe, 915E6 for North America
 
 
// Replace with your network credentials
String apiKey = "14K8UL2QEK8BTHN6"; // Enter your Write API key from ThingSpeak
const char *ssid = "Alexahome"; // replace with your wifi ssid and wpa2 key
const char *password = "12345678";
const char* server = "api.thingspeak.com";
 
WiFiClient client;
 
 
// Initialize variables to get and save LoRa data
int rssi;
String loRaMessage;
String temperature;
String humidity;
String readingID;
 
 
// Replaces placeholder with DHT values
String processor(const String& var){
  //Serial.println(var);
  if(var == "TEMPERATURE")
  {
    return temperature;
  }
  else if(var == "HUMIDITY")
  {
    return humidity;
  }
  else if (var == "RRSI")
  {
    return String(rssi);
  }
  return String();
}
 
void setup() {
  Serial.begin(115200);
  int counter;
 
  //setup LoRa transceiver module
  LoRa.setPins(ss, rst, dio0); //setup LoRa transceiver module
 
  while (!LoRa.begin(BAND) && counter < 10) {
    Serial.print(".");
    counter++;
    delay(2000);
  }
  if (counter == 10) {
    // Increment readingID on every new reading
    Serial.println("Starting LoRa failed!"); 
  }
  Serial.println("LoRa Initialization OK!");
  delay(2000);
 
  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(2000);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
 
 
// Read LoRa packet and get the sensor readings
void loop() 
{
  int packetSize = LoRa.parsePacket();
  if (packetSize)
  {
    Serial.print("Lora packet received: ");
    while (LoRa.available())    // Read packet
  {
    String LoRaData = LoRa.readString();
    Serial.print(LoRaData); 
    
    
    int pos1 = LoRaData.indexOf('/');   
    int pos2 = LoRaData.indexOf('&');   
    readingID = LoRaData.substring(0, pos1);                   // Get readingID
    temperature = LoRaData.substring(pos1 +1, pos2);           // Get temperature
    humidity = LoRaData.substring(pos2+1, LoRaData.length());  // Get humidity
  }
  
  rssi = LoRa.packetRssi();       // Get RSSI
  Serial.print(" with RSSI ");    
  Serial.println(rssi);
}
 
  
  if (client.connect(server, 80)) // "184.106.153.149" or api.thingspeak.com
   {
      String postStr = apiKey;
      postStr += "&field1=";
      postStr += String(readingID);
      postStr += "&field2=";
      postStr += String(temperature);
      postStr += "&field3=";
      postStr += String(humidity);
      postStr += "&field4=";
      postStr += String(rssi);
      postStr += "\r\n\r\n\r\n\r\n";
    
      client.print("POST /update HTTP/1.1\n");
      client.print("Host: api.thingspeak.com\n");
      client.print("Connection: close\n");
      client.print("X-THINGSPEAKAPIKEY: " + apiKey + "\n");
      client.print("Content-Type: application/x-www-form-urlencoded\n");
      client.print("Content-Length: ");
      client.print(postStr.length());
      client.print("\n\n");
      client.print(postStr);
 
    }    
    //delay(30000);
}