ESP nowでやりとり 受信側

 受信側

#include <Arduino.h>

#include <esp_now.h>

#include <WiFi.h>

const int LED_PIN = 5;

bool ledState = false;

bool received = false;

 uint8_t slaveAddress[] = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 }; // 受信機のMACアドレスに書き換えます

void flashLed() {

    digitalWrite(LED_PIN, HIGH);

    delay(500);

    digitalWrite(LED_PIN, LOW);

}

void onSend(const uint8_t* mac_addr, esp_now_send_status_t status) {

    char macStr[18];

    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.println(macStr);

    Serial.println(status == ESP_NOW_SEND_SUCCESS ? "Success" : "Failed");

}

void onReceive(const uint8_t* mac_addr, const uint8_t* data, int data_len) {

    char macStr[18];

    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.println();

    Serial.printf("Last Packet Recv from: %s\n", macStr);

    Serial.printf("Last Packet Recv Data(%d): ", data_len);

    for (int i = 0; i < data_len; i++) {

        Serial.print(data[i]);

        Serial.print(" ");

        if (data[i] == 222) {

            flashLed();

            received = true;

        }

    }

}

void setup() {

    Serial.begin(115200);

    pinMode(LED_PIN, OUTPUT);

    flashLed();

    Serial.println(WiFi.macAddress()); // このアドレスを送信側へ登録します

    WiFi.mode(WIFI_STA);

    WiFi.disconnect();

    if (esp_now_init() == ESP_OK) {

        Serial.println("ESP-Now Init Success");

    }

    flashLed();

    esp_now_peer_info_t peerInfo = {}; //ココ重要

    memcpy(peerInfo.peer_addr, slaveAddress, 6);

    peerInfo.channel = 0;

    peerInfo.encrypt = false;

 

    if (esp_now_add_peer(&peerInfo) != ESP_OK) {

        Serial.println("Failed to add peer");

        return;

    }

    esp_now_register_send_cb(onSend);

    esp_now_register_recv_cb(onReceive);

}

void loop() {

  // put your main code here, to run repeatedly:

  uint8_t data[2] = { 33,55}; // 送信データ

  if(received){

    delay(100);

    received = false;

    esp_err_t result = esp_now_send(slaveAddress, data, sizeof(data));

    if (result == ESP_OK) {

        Serial.println("Sent with success");

    }

    else {

        Serial.println("Error sending the data");

    }

  }

}