/*************************************************************************************************
                                      PROGRAMMINFO
**************************************************************************************************
Funktion: LoRa Heltec BME280 Sender A177

**************************************************************************************************
Version: 11.07.2022
**************************************************************************************************
Board: Heltec WiFI LoRa 32
**************************************************************************************************
Libraries:
https://github.com/espressif/arduino-esp32/tree/master/libraries
C:\Users\User\Documents\Arduino
D:\gittemp\Arduino II\A156_Wetterdaten_V3
**************************************************************************************************
C++ Arduino IDE V1.8.19
**************************************************************************************************
Einstellungen:
https://dl.espressif.com/dl/package_esp32_index.json
http://dan.drown.org/stm32duino/package_STM32duino_index.json
http://arduino.esp8266.com/stable/package_esp8266com_index.json
**************************************************************************************************/

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

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

//Libraries BME280
#include <Adafruit_Sensor.h>
#include <Adafruit_BME280.h>

//define die Pins, die vom LoRa-Transceiver-Modul verwendet werden
#define SCK 5
#define MISO 19
#define MOSI 27
#define SS 18
#define RST 14
#define DIO0 26

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

//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

//BME280 Pins
#define SDA 21
#define SCL 22

TwoWire I2Cone = TwoWire(1);
Adafruit_BME280 bme;

//Packet Zaehler
int readingID = 0;

int counter = 0;
String LoRaMessage = "";

float temperature = 0;
float humidity = 0;
float pressure = 0;

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

//Initialsiere OLED display
void startOLED(){
  //Reset OLED Display
  pinMode(OLED_RST, OUTPUT);
  digitalWrite(OLED_RST, LOW);
  delay(20);
  digitalWrite(OLED_RST, HIGH);

  //Initialisiere 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");
}

//Initialisiere LoRa Modul
void startLoRA(){
  //SPI LoRa Pins
  SPI.begin(SCK, MISO, MOSI, SS);
  //Setup LoRa Sender Modul
  LoRa.setPins(SS, RST, DIO0);

  while (!LoRa.begin(BAND) && counter < 10) {
    Serial.print(".");
    counter++;
    delay(500);
  }
  if (counter == 10) {
    // Erhöhe die Lese-ID bei jedem neuen Messwert
    readingID++;
    Serial.println("Das Starten von LoRa ist fehlgeschlagen!"); 
  }
  Serial.println("LoRa-Initialisierung OK!");
  display.setCursor(0,10);
  display.clearDisplay();
  display.print("LoRa-Initialisierung OK!");
  display.display();
  delay(2000);
}

void startBME(){
  I2Cone.begin(SDA, SCL, 100000); 
  bool status1 = bme.begin(0x76, &I2Cone);  
  if (!status1) {
    Serial.println("Konnte keinen gültigen BME280_1 Sensor finden, Verkabelung überprüfen!");
    while (1);
  }
}

void getReadings(){
  temperature = bme.readTemperature();
  humidity = bme.readHumidity();
  pressure = bme.readPressure() / 100.0F;
}

void sendReadings() {
  LoRaMessage = String(readingID) + "/" + String(temperature) + "&" + String(humidity) + "#" + String(pressure);
  //Send LoRa packet to receiver
  LoRa.beginPacket();
  LoRa.print(LoRaMessage);
  LoRa.endPacket();
  
  display.clearDisplay();
  display.setCursor(0,0);
  display.setTextSize(1);
  display.print("LoRa-Paket gesendet!");
  display.setCursor(0,20);
  display.print("Temperatur:");
  display.setCursor(72,20);
  display.print(temperature);
  display.setCursor(0,30);
  display.print("Luftfeuchte:");
  display.setCursor(72,30);
  display.print(humidity);
  display.setCursor(0,40);
  display.print("Luftdruck:");
  display.setCursor(72,40);
  display.print(pressure);
  display.setCursor(0,50);
  display.print("Lese-ID:");
  display.setCursor(72,50);
  display.print(readingID);
  display.display();
  Serial.print("Paket senden: ");
  Serial.println(readingID);
  readingID++;
}

void setup() {
  //initialize Serial Monitor
  Serial.begin(115200);
  startOLED();
  startBME();
  startLoRA();
}
void loop() {
  getReadings();
  sendReadings();
  delay(10000);
}