// lora Sender for TTGO ESP32 915 Mhz modified by HwThinker
#include <SPI.h>
#include <LoRa.h>
#define LED_BUILTIN 2

#define SCK     5    // GPIO5  -- lora SCK
#define MISO    19   // GPIO19 -- lora MISO
#define MOSI    27   // GPIO27 -- lora MOSI
#define SS      18   // GPIO18 -- lora CS
#define RST     12   // GPIO14 -- RESET (If Lora does not work, replace it with GPIO14)
#define DI0     26   // GPIO26 -- IRQ(Interrupt Request)

#define BAND    915E6

int counter = 0;
int state = 0;

void setup() {
  // START aktivas Oled
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  while (!Serial); //If just the the basic function, must connect to a computer

  SPI.begin(SCK, MISO, MOSI, SS);
  LoRa.setPins(SS, RST, DI0);
  //  Serial.println("LoRa Sender");

  if (!LoRa.begin(BAND)) {
    Serial.println("Starting LoRa failed!");
    while (1);
  }

  
  Serial.println("LoRa Initial OK! Blinky 1.5 second");
  for (int i=0;i<15;i++) {
    digitalWrite(LED_BUILTIN, digitalRead(LED_BUILTIN) ? LOW : HIGH);
    delay(100);
  }
  
  
}

void loop() {

  Serial.print("Sending packet: ");
  Serial.println(counter);

  // send packet
  LoRa.beginPacket();
  LoRa.print("hello ");
  LoRa.print(counter);
  LoRa.endPacket();

  counter++;
  digitalWrite(LED_BUILTIN, (state) ? HIGH : LOW);
  delay(1000);
  state = !state;
  //or   digitalWrite(LED_BUILTIN, !digitalRead(LED_BUILTIN));
}