/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/esp-now-one-to-many-esp8266-nodemcu/
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/

#include <ESP8266WiFi.h>
#include <espnow.h>

// REPLACE WITH RECEIVER MAC Address
uint8_t broadcastAddress1[] = {0xDC, 0x4F, 0x22, 0x6E, 0x35, 0x3A};

// Structure example to send data
// Must match the receiver structure
typedef struct test_struct {
   int red;
   int green;
   int blue;
};
struct test_struct myMessage;

const int analogInPin = 0;
int sensorValue = 0;        // value read from the pot
int outputValue = 0;


// Create a struct_message called test to store variables to be sent
// test_struct test;

unsigned long lastTime = 0;  
unsigned long timerDelay = 500;  // send readings timer

// Callback when data is sent
void OnDataSent(uint8_t *mac_addr, uint8_t sendStatus) {
  char macStr[18];
  Serial.print("Packet to:");
  snprintf(macStr, sizeof(macStr), "%02x:%02x:%02x:%02x:%02x:%02x",
         mac_addr[0], mac_addr[1], mac_addr[2], mac_addr[3], mac_addr[4], mac_addr[5]);
  Serial.print(macStr);
  Serial.print(" send status: ");
  if (sendStatus == 0){
    Serial.println("Delivery success");
  }
  else{
    Serial.println("Delivery fail");
  }
}
 
void setup() {
  // Init Serial Monitor
  Serial.begin(115200);
 
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);
  WiFi.disconnect();

  // Init ESP-NOW
  if (esp_now_init() != 0) {
    Serial.println("Error initializing ESP-NOW");
    return;
  }

  esp_now_set_self_role(ESP_NOW_ROLE_CONTROLLER);
  
  // Once ESPNow is successfully Init, we will register for Send CB to
  // get the status of Trasnmitted packet
  esp_now_register_send_cb(OnDataSent);
  
  // Register peer
  esp_now_add_peer(broadcastAddress1, ESP_NOW_ROLE_SLAVE, 1, NULL, 0);

}
 
void loop() {
  if ((millis() - lastTime) > timerDelay) {
    // Set values to send
    // test.x = random(1, 50);
    // test.y = random(1, 50);

  sensorValue = analogRead(analogInPin);
  outputValue = map(sensorValue, 0, 1024, 0, 255);
  Serial.println(outputValue);
  myMessage.red = random(0, 254);
  myMessage.green = random(0, 254);
  myMessage.blue = outputValue;//random(0, 254);

    // Send message via ESP-NOW
    esp_now_send(0, (uint8_t *) &myMessage, sizeof(myMessage));

    lastTime = millis();
  }
}