#include "SSD1306.h" // alias for `#include "SSD1306Wire.h"`
#include <WiFi.h>
#include <SPI.h>
#include <LoRa.h>
// #include "SSD1306.h"
#include<Arduino.h>


//OLED pins to ESP32 GPIOs via this connecthin:
//OLED_SDA GPIO4
//OLED_SCL GPIO15
//OLED_RST GPIO16

SSD1306 display(0x3c, 4, 15);

 // WIFI_LoRa_32 ports
// GPIO5  SX1278 SCK
// GPIO19 SX1278 MISO
// GPIO27 SX1278 MOSI
// GPIO18 SX1278 CS
// GPIO14 SX1278 RESET
// GPIO26 SX1278 IRQ(Interrupt Request)

#define SS 18
#define RST 14
#define DI0 26
// #define BAND 429E6 //915E6

// #define BAND 434500000.00
#define BAND 434500000.00

#define spreadingFactor 9
// #define SignalBandwidth 62.5E3
#define SignalBandwidth 31.25E3
#define preambleLength 8
#define codingRateDenominator 8





int counter = 0;

void setup() {
  pinMode(25,OUTPUT); //Send success, LED will bright 1 second
  
  pinMode(16,OUTPUT);
  digitalWrite(16, LOW); // set GPIO16 low to reset OLED
  delay(50);
  digitalWrite(16, HIGH);
  
  Serial.begin(115200);
  while (!Serial); //If just the the basic function, must connect to a computer

// Initialising the UI will init the display too.
  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
  display.setTextAlignment(TEXT_ALIGN_LEFT);
  display.drawString(5,5,"LoRa Sender");
  display.display();
  
  SPI.begin(5,19,27,18);
  LoRa.setPins(SS,RST,DI0);
  Serial.println("LoRa Sender");
  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }
  
  Serial.print("LoRa Spreading Factor: ");
  Serial.println(spreadingFactor);
  LoRa.setSpreadingFactor(spreadingFactor);
  
  Serial.print("LoRa Signal Bandwidth: ");
  Serial.println(SignalBandwidth);
  LoRa.setSignalBandwidth(SignalBandwidth);

  LoRa.setCodingRate4(codingRateDenominator);

  LoRa.setPreambleLength(preambleLength);
  
  Serial.println("LoRa Initial OK!");
  display.drawString(5,20,"LoRa Initializing OK!");
  display.display();
  delay(2000);
}

void loop() {
  Serial.print("Sending packet: ");
  Serial.println(counter);
  
  display.clear();
  display.setFont(ArialMT_Plain_16);
  display.drawString(3, 5, "Sending packet ");
  display.drawString(50, 30, String(counter));
  display.display();
  
  // send packet
  LoRa.beginPacket();
  LoRa.print("Hello..");
  LoRa.print(counter);
  LoRa.endPacket();
  
  counter++;
  digitalWrite(25, HIGH); // turn the LED on (HIGH is the voltage level)
  delay(1000); // wait for a second
  digitalWrite(25, LOW); // turn the LED off by making the voltage LOW
  delay(1000); // wait for a second
  
// delay(3000);
}