/* ESPNOWBroadcastESP32v1
   04/02/2024

   delivery from other board fails because the MAC address has changed
   sending is OK because it's sending to all addresses.

*/


#include "esp_now.h"
#include "WiFi.h"

//no longer needed as wifi address not changed
//#include "esp_wifi.h" //extra library to change mac address

// REPLACE WITH YOUR RECEIVER MAC Address
uint8_t broadcastAddress[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };  //All stations broadcast address



// Structure example to send data
// Must match the receiver structure
typedef struct struct_message {
  byte myByte[50];
} struct_message;

// Create a struct_message called myData
struct_message sendData;  //data to be sent
struct_message recData;   //data received

esp_now_peer_info_t peerInfo;





// callback function that will be executed when data is received
void OnDataRecv(const uint8_t *mac, const uint8_t *incomingData, int len) {
  memcpy(&recData, incomingData, sizeof(recData));

  //WARNING: The code below is badly written and to demonstrate the onDataRevv function only
  //Any data should be copied out of this function as quickly as possible and processed in the main loop
  //This will allow for the next set of data to arrive
  //Use similar to an interrupt routine
  Serial.print("Bytes received: ");
  Serial.println(len);
  for (int w = 0; w < 50; w++) {
    Serial.print("byte: ");
    Serial.print(w);
    Serial.print(" = ");
    Serial.print(recData.myByte[w]);
  }
  Serial.println(" ");
}

void setup() {
  // Init Serial Monitor
  Serial.begin(115200);
  Serial.println("ESPNOWBroadcastESP32v1");
  // Set device as a Wi-Fi Station
  WiFi.mode(WIFI_STA);



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



  //on data receive function
  esp_now_register_recv_cb(OnDataRecv);

  // Register peer
  memcpy(peerInfo.peer_addr, broadcastAddress, 6);
  //peerInfo.channel = 0;
  peerInfo.channel = 1;
  peerInfo.encrypt = false;

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

byte q;  //used to store an incrementing byte to demo transmission
unsigned long currentMillis;
unsigned long transmitMillis;
int transmitTimer = 2000;

void loop() {
  int w;  //just used as a counter
  currentMillis = millis();
  if (currentMillis - transmitMillis >= transmitTimer) {
    transmitMillis = currentMillis;
    q++;
    // Set values to send
    for (w = 0; w < 50; w++) {
      //different send data patterns to distinguish between boards
      //sendData.myByte[w] =  q++;//q will overun at 255 and go back to Zero
      sendData.myByte[w] = w + q;  //q will overun at 255 and go back to Zero
      Serial.print(sendData.myByte[w]);
      Serial.print(",");
    }
    Serial.println(" ");


    // Send message via ESP-NOW
    esp_err_t result = esp_now_send(broadcastAddress, (uint8_t *)&sendData, sizeof(sendData));
    //Serial.println(result);
  }
}