//wokwi.com/projects/459897776795004929

#if defined(CONFIG_IDF_TARGET_ESP32C6)
// ==========================================================
// ====== ΚΩΔΙΚΑΣ ΓΙΑ ΤΟΝ ΚΕΝΤΡΙΚΟ ΠΙΝΑΚΑ (ESP32-C6) ======
// ==========================================================

#include <WiFi.h>
#include <esp_now.h>

uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
esp_now_peer_info_t peerInfo;

typedef struct struct_message {
    char text[ 21 ];
} struct_message;
struct_message outgoingMsg;

void OnDataRecv(const esp_now_recv_info *info, const uint8_t *incomingData, int len) {
  if (len == sizeof(char)) {
    char receivedKey = (char)(*incomingData);
    Serial.print("ΛΗΨΗ ΣΤΟΝ C6! Πατήθηκε το: ");
    Serial.println(receivedKey);

    String reply = "Got Key: ";
    reply += receivedKey;
    reply.toCharArray(outgoingMsg.text, 21);
    esp_now_send(broadcastAddress, (uint8_t *) &outgoingMsg, sizeof(outgoingMsg));
  }
}

void setup() {
  Serial.begin(115200);
  Serial.println("C6 Main Unit Ready");
  WiFi.mode(WIFI_STA);
  esp_now_init();
  esp_now_register_recv_cb(OnDataRecv);
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;  
  peerInfo.encrypt = false;
  esp_now_add_peer(&peerInfo);
}

void loop() { 
  delay(10); 
}

#elif defined(CONFIG_IDF_TARGET_ESP32C3)
// ==========================================================
// ========= ΚΩΔΙΚΑΣ ΓΙΑ ΤΟ ΤΕΡΜΑΤΙΚΟ (ESP32-C3) ==========
// ==========================================================

#include <WiFi.h>
#include <esp_now.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);

const byte ROWS = 4; const byte COLS = 4; 
char keys[ROWS][COLS] = {
  {'1','2','3','A'}, {'4','5','6','B'}, {'7','8','9','C'}, {'*','0','#','D'}
};
byte rowPins[ROWS] = {0, 1, 2, 3}; 
byte colPins[COLS] = {4, 5, 6, 7}; 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
esp_now_peer_info_t peerInfo;

typedef struct struct_message {
    char text[ 21 ];
} struct_message;
struct_message incomingMsg;

void OnDataRecv(const esp_now_recv_info *info, const uint8_t *incomingData, int len) {
  memcpy(&incomingMsg, incomingData, sizeof(incomingMsg));
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Msg from C6:");
  lcd.setCursor(0, 1);
  lcd.print(incomingMsg.text);
}

void setup() {
  Serial.begin(115200);
  Wire.begin(8, 9);
  lcd.init(); lcd.backlight();
  lcd.print("C3 Terminal Ready");

  WiFi.mode(WIFI_STA);
  esp_now_init();
  esp_now_register_recv_cb(OnDataRecv);
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;  
  peerInfo.encrypt = false;
  esp_now_add_peer(&peerInfo);
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    esp_now_send(broadcastAddress, (uint8_t *) &key, sizeof(key));
  }
}

#endif