Sender7. ESP-NOW

//Sender 2. Cut down delay from 3 to 1 sec. Tue Jul 19 15:47:45 NZST 2022
//Sender3 counting and sending packet count.
//Sender7 put in blink to see while outside.
//Try #include <arduino-timer.h>. Lower pause to 500ms.No, promlems
//Try unsigned long previousMillis = 0;        // will store last time LED was updated


//const long interval = 1000;
/****************************************************************************************************************************************************
 *  TITLE: ESP-NOW Getting Started Examples
 *
 *  By Frenoy Osburn
 *  YouTube Video: https://youtu.be/_cNAsTB5JpM
 ****************************************************************************************************************************************************/

 /********************************************************************************************************************
  * Please make sure that you install the board support package for the ESP8266 boards.
  * You will need to add the following URL to your Arduino preferences.
  * Boards Manager URL: http://arduino.esp8266.com/stable/package_esp8266com_index.json
 ********************************************************************************************************************/

 /********************************************************************************************************************
 *  Board Settings:
 *  Board: "WeMos D1 R1 or Mini"
 *  Upload Speed: "921600"
 *  CPU Frequency: "80MHz"
 *  Flash Size: "4MB (FS:@MB OTA:~1019KB)"
 *  Debug Port: "Disabled"
 *  Debug Level: "None"
 *  VTables: "Flash"
 *  IwIP Variant: "v2 Lower Memory"
 *  Exception: "Legacy (new can return nullptr)"
 *  Erase Flash: "Only Sketch"
 *  SSL Support: "All SSL ciphers (most compatible)"
 *  COM Port: Depends *On Your System*
 *********************************************************************************************************************/
 #include<ESP8266WiFi.h>
#include<espnow.h>
//#include <arduino-timer.h> //might need this

#define MY_NAME         "CONTROLLER_NODE"
#define MY_ROLE         ESP_NOW_ROLE_CONTROLLER         // set the role of this device: CONTROLLER, SLAVE, COMBO
#define RECEIVER_ROLE   ESP_NOW_ROLE_SLAVE              // set the role of the receiver
#define WIFI_CHANNEL    1

//uint8_t receiverAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};   // please update this with the MAC address of the receiver
uint8_t receiverAddress[] = {0x98, 0xF4, 0xAB, 0xBF, 0xEC, 0xCC};   // Mac adress of Wemos Mini 2

struct __attribute__((packed)) dataPacket {
  int sensor1;
  int sensor2;
  float sensor3;
};
int count=0;    //count the number of packets being sent
 unsigned long previousMillis = 0;        // will store last time LED was updated
 unsigned long time_ms;
 float er=0, se=0 , elapsed=0;
 float suc = 0;
 int t =0;


void transmissionComplete(uint8_t *receiver_mac, uint8_t transmissionStatus) {
  if(transmissionStatus == 0) {
//    Serial.println("Data sent successfully");
    Serial.println(se++);   //number of successful attemps to send
    Serial.println();

    //Blink the LED
    t++; if(t==2) t=0;
    Serial.println(t);
    if (t==1) digitalWrite(LED_BUILTIN, HIGH);
    if (t==0) digitalWrite(LED_BUILTIN, LOW);

  } else {
    Serial.print(er++);
    Serial.print(" Err code: ");

    Serial.println(transmissionStatus);
  }
  suc= float(se/(se+er));
  Serial.println("se,er,suc ");
  Serial.println(se);
  Serial.println(er);
  //Serial.print(suc);
  Serial.println(suc);
}

void setup() {
  Serial.begin(115200);     // initialize serial port

  Serial.println();
  Serial.println();
  Serial.println();
  Serial.print("Initializing...");
  Serial.println(MY_NAME);
  Serial.print("My MAC address is: ");
  Serial.println(WiFi.macAddress());

  WiFi.mode(WIFI_STA);
  WiFi.disconnect();        // we do not want to connect to a WiFi network

  if(esp_now_init() != 0) {
    Serial.println("ESP-NOW initialization failed");
    return;
  }

  esp_now_set_self_role(MY_ROLE);
  esp_now_register_send_cb(transmissionComplete);   // this function will get called once all data is sent
  esp_now_add_peer(receiverAddress, RECEIVER_ROLE, WIFI_CHANNEL, NULL, 0);

  Serial.println("Initialized.");
   pinMode(LED_BUILTIN, OUTPUT); //added
}

void loop() {
  dataPacket packet;

  packet.sensor1 = count++; //124;
  packet.sensor2 = 456;
  packet.sensor3 = 2.141;

previousMillis = millis();
  esp_now_send(receiverAddress, (uint8_t *) &packet, sizeof(packet));
/*  time_ms = millis();
  Serial.println(previousMillis);
  Serial.println(time_ms);
  elapsed= time_ms-previousMillis;
  Serial.print("elapsed=");
  Serial.println(elapsed); */
  delay(200);
}