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#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"

//Libraries for LoRa
#include <SPI.h>
#include <LoRa.h>

//Libraries for OLED Display
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

//define the pins used by the LoRa transceiver module
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 14
#define DIO0 26

//433E6 for Asia
//866E6 for Europe
//915E6 for North America
#define BAND 915E6

//OLED pins
#define OLED_SDA 4
#define OLED_SCL 15 
#define OLED_RST 16
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

//packet counter
int counter = 0;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RST);

#define I2CSDA 21
#define I2CSCL 13
#define SEALEVELPRESSURE_HPA (1013.25)
TwoWire I2CPin = TwoWire(0);
Adafruit_BME680 bme; // I2C
float temperature;
float humidity;
float pressure;
bool status1;

String LoRaMessage = "";

void setup() {
  Serial.begin(115200);

  //reset OLED display via software
  pinMode(OLED_RST, OUTPUT);
  digitalWrite(OLED_RST, LOW);
  delay(20);
  digitalWrite(OLED_RST, HIGH);

  //initialize OLED
  Wire.begin(OLED_SDA, OLED_SCL);
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3c, false, false)) { // Address 0x3C for 128x32
    Serial.println(F("SSD1306 allocation failed"));
    for(;;); // Don't proceed, loop forever
  }
  
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(1);
  display.setCursor(0,0);
  display.print("LORA SENDER ");
  display.display();
  
  //SPI LoRa pins
  SPI.begin(SCK, MISO, MOSI, SS);
  //setup LoRa transceiver module
  LoRa.setPins(SS, RST, DIO0);
  
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }  bool status;

  display.setCursor(0,10);
  display.print("LoRa Initializing OK!");
  display.display();
  delay(2000);

  I2CPin.begin(I2CSDA, I2CSCL, 100000); 
  bool status1 = bme.begin(0x77, &I2CPin);  
  if (!status1) {
    Serial.println("[b]Could not find a valid BME280_1 sensor, check wiring!"[/b]);
  } else {
    // Set up oversampling and filter initialization
    bme.setTemperatureOversampling(BME680_OS_8X);
    bme.setHumidityOversampling(BME680_OS_2X);
    bme.setPressureOversampling(BME680_OS_4X);
    bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
    bme.setGasHeater(320, 150); // 320*C for 150 ms
  }
}

void loop() { 
  if (!bme.performReading()) {
    LoRaMessage = String("BME680 Read Failed: ") + String(counter);
    //Send LoRa packet to receiver
    LoRa.beginPacket();
    LoRa.print(LoRaMessage);
    LoRa.endPacket();
  
    display.clearDisplay();
    display.setCursor(0,0);
    display.println("LORA SENDER");
    display.setCursor(0,20);
    display.setTextSize(1);
    display.print("LoRa packet sent.");
    display.setCursor(0,30);
    display.print("Counter:");
    display.setCursor(50,30);
    display.print(counter);      
    display.display();
  } else {
    temperature = bme.temperature;
    humidity    = bme.humidity;
    pressure    = bme.pressure/100.00;
    LoRaMessage = String(temperature) + "* " + String(humidity) + "% " +String(pressure) + "^ " + String(counter);
    //Send LoRa packet to receiver
    LoRa.beginPacket();
    LoRa.print(LoRaMessage);
    LoRa.endPacket();
  
    display.clearDisplay();
    display.setCursor(0,0);
    display.println("LORA SENDER");
    display.setCursor(0,20);
    display.setTextSize(1);
    display.print("LoRa packet sent.");
    display.setCursor(0,30);
    display.print("Counter:");
    display.setCursor(50,30);
    display.print(counter);      
    display.display();
  }
  counter++;
  delay(10000);
}