#include <esp_now.h>

#include <WiFi.h>

// Variables for test data

int moistRead;

unsigned long startMillis;
unsigned long currentMillis;
const unsigned long period = 1000;

const int sensor_pin = D1;

// MAC Address of responder - edit as required
uint8_t broadcastAddress[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

// Define a data structure
typedef struct struct_message {
  int b;
} struct_message;

// Create a structured object
struct_message myData;

// Peer info
esp_now_peer_info_t peerInfo;

// Callback function called when data is sent
void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {
  Serial.print("\r\nLast Packet Send Status:\t");
  Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Delivery Success" : "Delivery Fail");
}

void setup() {

  // Set up Serial Monitor
  Serial.begin(115200);

  // Set ESP32 as a Wi-Fi Station
  WiFi.mode(WIFI_STA);

  startMillis = millis();
  pinMode(sensor_pin, INPUT);

  // Initilize ESP-NOW
  if (esp_now_init() != ESP_OK) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  // Register the send callback
  esp_now_register_send_cb(OnDataSent);

  // Register peer
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  peerInfo.channel = 0;
  peerInfo.encrypt = false;

  // Add peer
  if (esp_now_add_peer(&peerInfo) != ESP_OK) {
    Serial.println("Failed to add peer");
    return;
  }
}

void loop() {

  if (currentMillis - startMillis >= period) {
    moistRead = analogRead(sensor_pin);
    Serial.println(moistRead);
  }

  // Create test data


  // Format structured data
  moistRead = map(moistRead,4095,1100,0,100);
  myData.b = (uint8_t) moistRead;
  Serial.println((uint8_t) moistRead);

  // Send message via ESP-NOW
  esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *)&myData, sizeof(myData));

  if (result == ESP_OK) {
    Serial.println("Sending confirmed");
  } else {
    Serial.println("Sending error");
  }
  delay(2000);
}