#include <WiFi.h>
#include <esp_now.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// OLED display width and height
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64

// Create display object
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

// Structure to receive data
typedef struct struct_message {
     float value;
} struct_message;

struct_message myData;

// New ESP-IDF v5.x compatible callback
void onDataRecv(const esp_now_recv_info_t *info, const uint8_t *incomingData, int len) {
    memcpy(&myData, incomingData, sizeof(myData));
    Serial.print("Received Value: ");
    Serial.print(myData.value);
    Serial.println(" A");
   
}

void setup() {
    Serial.begin(115200);
 // Initialize OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // 0x3C is the I2C address
    Serial.println(F("SSD1306 allocation failed"));
    while (1); // Halt execution
  }

  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(SSD1306_WHITE);
    WiFi.mode(WIFI_STA); // Set ESP32 to Station mode

    // Initialize ESP-NOW
    if (esp_now_init() != ESP_OK) {
        Serial.println("ESP-NOW Init Failed!");
        return;
    }

    esp_now_register_recv_cb(onDataRecv); // Register new ESP-NOW receive callback
}

void loop() {
display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Pradeep");
    display.setCursor(0, 18);
  display.print("CurrentRMS");
      display.setCursor(10, 40);
  display.print(myData.value);
        display.setCursor(60, 40);
  display.print("A");
  display.display();
    // Do nothing, waiting for ESP-NOW messages
}