M5NanoC6、内蔵ボタンの状態を無線で送る。(ESP-NOW)


x 過去ログを見よ
x ブロードキャストと言ってラジオみたいな通信
x けつこう、通信が失敗する、細かい事を気にするな!!


目的
ESP-NOWのホストのプログラムと内蔵ボタンのプログラムを
魔法合成する。よつて、合成魔法ができる。? なんの事

ホスト　NanoC6(ボタン)
スレーブ StampS3

結果

![o_coq538.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/ca0926ec-0a35-71ae-b9e6-f4aa7f076a44.jpeg)


(ホストとスレーブ)

![o_coq539.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/7eefa14a-43a1-4f71-776d-afe35e01be66.jpeg)

![o_coq540.jpg](https://qiita-image-store.s3.ap-northeast-1.amazonaws.com/0/840352/c232a910-6efa-7988-a271-03a41934d9f2.jpeg)


プログラム

(NanoC6 ホスト)


```c++



//ESP32_NOW_m_button1_M5NanoC6


//インクルド
#include <M5NanoC6.h> //SW
#include "ESP32_NOW.h"
#include "WiFi.h"
#include <esp_mac.h>  // For the MAC2STR and MACSTR macros


//定義
/* Definitions */

//WiFiチャンネルの指定
#define ESPNOW_WIFI_CHANNEL 1

//クラス
/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Broadcast_Peer : public ESP_NOW_Peer {
  public:
    // Constructor of the class using the broadcast address
    ESP_NOW_Broadcast_Peer(uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(ESP_NOW.BROADCAST_ADDR, channel, iface, lmk) {}

    // Destructor of the class
    ~ESP_NOW_Broadcast_Peer() {
      remove();
    }

    // Function to properly initialize the ESP-NOW and register the broadcast peer
    bool begin() {
      if (!ESP_NOW.begin() || !add()) {
        log_e("Failed to initialize ESP-NOW or register the broadcast peer");
        return false;
      }
      return true;
    }

    // Function to send a message to all devices within the network
    bool send_message(const uint8_t *data, size_t len) {
      if (!send(data, len)) {
        log_e("Failed to broadcast message");
        return false;
      }
      return true;
    }
};

/* Global Variables */

uint32_t msg_count = 0;

//ブロードキャスト オブジェクトの定義
// Create a broadcast peer object
ESP_NOW_Broadcast_Peer broadcast_peer(ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

/* Main */


//初期化
void setup() {

  NanoC6.begin(); //SW

  //WiFiの初期化
  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }//while

  //ブロードキャストの初期化
  // Register the broadcast peer
  if (!broadcast_peer.begin()) {
    delay(5000);
    ESP.restart();
  }//endif

  //スタートメッセージを送る debug
  delay(5000);
  //                                           123456789012345
  if (!broadcast_peer.send_message((uint8_t *)"Start SYSTEM!!\n", 15)) {
    //ERR
  }//endif

}//setup


//メインループ
void loop() {
  // Broadcast a message to all devices within the network
  static char data[32];

  //ボタンの状態の更新
  NanoC6.update();

  //ボタンを押した時
  if (NanoC6.BtnA.wasPressed()) {

    snprintf(data, sizeof(data), "Button A was pressed #%lu", msg_count++);

    if (!broadcast_peer.send_message((uint8_t *)data, sizeof(data))) {
      //ERR
    }//endif

  }//endif

  //ボタンを押し続けた時
  if (NanoC6.BtnA.wasHold()) {

    snprintf(data, sizeof(data), "Button A was hold #%lu", msg_count++);

    if (!broadcast_peer.send_message((uint8_t *)data, sizeof(data))) {
      //ERR
    }//endif

  }//endif

  //ボタンを離した時
  if (NanoC6.BtnA.wasReleased()) {

    snprintf(data, sizeof(data), "Button A was released #%lu", msg_count++);

    if (!broadcast_peer.send_message((uint8_t *)data, sizeof(data))) {
      //ERR
    }//endif

  }//endif

  delay(1);//ダミー

}//loop


```

(スレーブ　StampS3)


```c++



/*
    ESP-NOW Broadcast Slave
    Lucas Saavedra Vaz - 2024

    This sketch demonstrates how to receive broadcast messages from a master device using the ESP-NOW protocol.

    The master device will broadcast a message every 5 seconds to all devices within the network.

    The slave devices will receive the broadcasted messages. If they are not from a known master, they will be registered as a new master
    using a callback function.
*/

#include "ESP32_NOW.h"
#include "WiFi.h"

#include <esp_mac.h>  // For the MAC2STR and MACSTR macros

#include <vector>

/* Definitions */

#define ESPNOW_WIFI_CHANNEL 1

/* Classes */

// Creating a new class that inherits from the ESP_NOW_Peer class is required.

class ESP_NOW_Peer_Class : public ESP_NOW_Peer {
public:
  // Constructor of the class
  ESP_NOW_Peer_Class(const uint8_t *mac_addr, uint8_t channel, wifi_interface_t iface, const uint8_t *lmk) : ESP_NOW_Peer(mac_addr, channel, iface, lmk) {}

  // Destructor of the class
  ~ESP_NOW_Peer_Class() {}

  // Function to register the master peer
  bool add_peer() {
    if (!add()) {
      log_e("Failed to register the broadcast peer");
      return false;
    }
    return true;
  }

  // Function to print the received messages from the master
  void onReceive(const uint8_t *data, size_t len, bool broadcast) {
    Serial.printf("Received a message from master " MACSTR " (%s)\n", MAC2STR(addr()), broadcast ? "broadcast" : "unicast");
    Serial.printf("  Message: %s\n", (char *)data);
  }
};

/* Global Variables */

// List of all the masters. It will be populated when a new master is registered
std::vector<ESP_NOW_Peer_Class> masters;

/* Callbacks */

// Callback called when an unknown peer sends a message
void register_new_master(const esp_now_recv_info_t *info, const uint8_t *data, int len, void *arg) {
  if (memcmp(info->des_addr, ESP_NOW.BROADCAST_ADDR, 6) == 0) {
    Serial.printf("Unknown peer " MACSTR " sent a broadcast message\n", MAC2STR(info->src_addr));
    Serial.println("Registering the peer as a master");

    ESP_NOW_Peer_Class new_master(info->src_addr, ESPNOW_WIFI_CHANNEL, WIFI_IF_STA, NULL);

    masters.push_back(new_master);
    if (!masters.back().add_peer()) {
      Serial.println("Failed to register the new master");
      return;
    }
  } else {
    // The slave will only receive broadcast messages
    log_v("Received a unicast message from " MACSTR, MAC2STR(info->src_addr));
    log_v("Igorning the message");
  }
}

/* Main */

void setup() {
  Serial.begin(115200);

  for(int i=0;i<30;i++){
    Serial.println("WiFi");
    delay(1000);
  }//for


//  while (!Serial) {
//    delay(10);
//  }

  // Initialize the Wi-Fi module
  WiFi.mode(WIFI_STA);
  WiFi.setChannel(ESPNOW_WIFI_CHANNEL);
  while (!WiFi.STA.started()) {
    delay(100);
  }

  Serial.println("ESP-NOW Example - Broadcast Slave");
  Serial.println("Wi-Fi parameters:");
  Serial.println("  Mode: STA");
  Serial.println("  MAC Address: " + WiFi.macAddress());
  Serial.printf("  Channel: %d\n", ESPNOW_WIFI_CHANNEL);

  // Initialize the ESP-NOW protocol
  if (!ESP_NOW.begin()) {
    Serial.println("Failed to initialize ESP-NOW");
    Serial.println("Reeboting in 5 seconds...");
    delay(5000);
    ESP.restart();
  }

  // Register the new peer callback
  ESP_NOW.onNewPeer(register_new_master, NULL);

  Serial.println("Setup complete. Waiting for a master to broadcast a message...");
}

void loop() {
  delay(1000);
}






```