ESP nowでやりとり 送信側

 送信側

#include <Arduino.h>

#include <esp_now.h>

#include <WiFi.h>

 int8_t slaveAddress[] = { 0x11, 0x22, 0x33, 0x44, 0x55, 0x66 }; // 受信機のMACアドレスに書き換えます

const int LED_PIN = 5;

bool ledState = false;

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.println(" ");

        if (data[i] == 55) {

            flashLed();

        }

    }

}

void setup() {

  // put your setup code here, to run once:

  Serial.begin(115200);

  WiFi.mode(WIFI_STA);

  WiFi.disconnect();

  pinMode(LED_PIN, OUTPUT);

  flashLed();

  if (esp_now_init() == ESP_OK) {

      Serial.println("ESPNow Init Success");

  }

  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] = { 111, 222 }; // 送信データ

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

  Serial.print("Send Status: ");

  switch (result)

  {

  case ESP_OK:

      Serial.println("Success");

      break;

  case ESP_ERR_ESPNOW_NOT_INIT:

      Serial.println("ESPNOW not Init.");

      break;

  case ESP_ERR_ESPNOW_ARG:

      Serial.println("Invalid Argument");

      break;

  case ESP_ERR_ESPNOW_INTERNAL:

      Serial.println("Internal Error");

      break;

  case ESP_ERR_ESPNOW_NO_MEM:

      Serial.println("ESP_ERR_ESPNOW_NO_MEM");

      break;

  case ESP_ERR_ESPNOW_NOT_FOUND:

      Serial.println("Peer not found.");

      break;

  default:

      Serial.println("Not sure what happened");

      break;

  }

   

  delay(5000);

}