谷歌网站地图,极致优化WordPress网站速度,网站制作排序,网站挂马怎么办ESP32学习---ESP-NOW 基于Arduino IDE环境获取mac地址单播通讯一对多通讯多对一通讯多对多通讯模块1代码模块2模块3 广播通讯 基于ESP-IDF框架 乐鑫编程指南中关于ESP-NOW的介绍#xff1a;https://docs.espressif.com/projects/esp-idf/zh_CN/v5.2.1/esp32/api-reference/net… ESP32学习---ESP-NOW 基于Arduino IDE环境获取mac地址单播通讯一对多通讯多对一通讯多对多通讯模块1代码模块2模块3 广播通讯 基于ESP-IDF框架 乐鑫编程指南中关于ESP-NOW的介绍https://docs.espressif.com/projects/esp-idf/zh_CN/v5.2.1/esp32/api-reference/network/esp_now.html
乐鑫提供的esp-now仓库https://github.com/espressif/esp-now
基于Arduino IDE环境
基于arduino环境的ESP-NOW教程https://randomnerdtutorials.com/esp-now-esp32-arduino-ide/ 可以从左侧的目录栏找到对应的ESP-NOW教程的位置如下所示
ESP-NOW自动配对功能实现的参考链接https://randomnerdtutorials.com/esp-now-auto-pairing-esp32-esp8266/
获取mac地址
对于ESP-NOW协议来说mac地址是个不可或缺的数据模块之间的配对需要用到这里是获取mac地址的方法
#include WiFi.hvoid setup() {// put your setup code here, to run once:Serial.begin(115200);WiFi.mode(WIFI_MODE_STA);Serial.println(WiFi.macAddress());
}void loop() {// put your main code here, to run repeatedly:}打开串口监视器复位模块显示信息中会包含如下信息即为mac地址
16:38:06.244 - A0:B7:65:60:E7:B8单播通讯
一对多通讯
多对一通讯
多对多通讯
这里使用3个模块之间互相传输数据首先我们先要获取到3个模块的MAC地址每个模块向外发送数据并同时接收来自于其它两个模块的数据
模块1代码
esp_now_1.ino : //发送端的程序
#include WiFi.h
#include esp_now.h// 1作为发送2和3作为接收
//接收端的MAC地址 16:38:06.244 - A0:B7:65:60:E7:B8
uint8_t broadcastAddress1[] {0xA0,0xB7,0x65,0x4F,0x27,0x30};
uint8_t broadcastAddress2[] {0xA0,0xB7,0x65,0x60,0xE7,0xB8};
uint8_t broadcastAddress3[] {0xA0,0xB7,0x65,0x48,0x78,0x9C};//A0:B7:65:48:78:9C
// uint8_t broadcastAddress2[] {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};
// uint8_t broadcastAddress3[] {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF};//发送数据类型
typedef struct {char a[32];int b;float c;bool d;
} Message_t;Message_t msg, rcv_msg;void OnDataSent(const uint8_t *mac_addr, esp_now_send_status_t status) {Serial.print(\r\nLast Packet Send Status:\t);Serial.println(status ESP_NOW_SEND_SUCCESS ? Delivery Success : Delivery Fail);
}void OnDataRecv(const uint8_t *mac_addr, const uint8_t *incomingData, int len) {memcpy(rcv_msg, incomingData, sizeof(rcv_msg));Serial.print(Bytes received: );Serial.println(len);Serial.print(Char: );Serial.print(rcv_msg.a);Serial.print(Int: );Serial.println(rcv_msg.b);Serial.print(float: );Serial.println(rcv_msg.c);Serial.print(Bool: );Serial.println(rcv_msg.d);Serial.println();
}esp_now_peer_info_t peerInfo2;
esp_now_peer_info_t peerInfo3;void setup() {// put your setup code here, to run once:Serial.begin(115200);WiFi.mode(WIFI_MODE_STA);Serial.println(WiFi.macAddress());if(esp_now_init() ! ESP_OK){Serial.println(Error init ESP-NOW);return;}esp_now_register_send_cb(OnDataSent); //注册发送回调函数esp_now_register_recv_cb(OnDataRecv); //注册接收回调函数//注册通信频道// esp_now_peer_info_t peerInfo;memcpy(peerInfo2.peer_addr, broadcastAddress2, 6);char macStr[18];snprintf(macStr,sizeof(macStr),%02x:%02x:%02x:%02x:%02x:%02x, peerInfo2.peer_addr[0],peerInfo2.peer_addr[1],peerInfo2.peer_addr[2],peerInfo2.peer_addr[3],peerInfo2.peer_addr[4], peerInfo2.peer_addr[5]);Serial.print(mac addr: );Serial.println(macStr);peerInfo2.channel 1; //通道peerInfo2.encrypt false; //是否加密if(esp_now_add_peer(peerInfo2) ! ESP_OK) {Serial.println(Failed to add peer 2);return;}// 3memcpy(peerInfo3.peer_addr, broadcastAddress3, 6);peerInfo3.channel 1; //peerInfo3.encrypt false; if(esp_now_add_peer(peerInfo3) ! ESP_OK) {Serial.println(Failed to add peer 3);return;}}void loop() {// put your main code here, to run repeatedly:strcpy(msg.a, this is a char);msg.b random(1, 20);msg.c 10.0f;msg.d false;esp_err_t result esp_now_send(0, (uint8_t *)msg, sizeof(msg));if(result ESP_OK) {Serial.println(Sent with success);} else {Serial.println(Error sending the data);}delay(200);
}
模块2
esp_now_2.ino
// 接收端程序
#include WiFi.h
#include esp_now.h//2作为发送1和3作为接收
uint8_t broadcastAddress1[] {0xA0,0xB7,0x65,0x4F,0x27,0x30};
uint8_t broadcastAddress2[] {0xA0,0xB7,0x65,0x60,0xE7,0xB8};
uint8_t broadcastAddress3[] {0xA0,0xB7,0x65,0x48,0x78,0x9C};//A0:B7:65:48:78:9Ctypedef struct {char a[32];int b;float c;bool d;
}Message_t;Message_t send_msg, rcv_msg;void OnDataSend(const uint8_t *mac_addr, esp_now_send_status_t status) {Serial.print(\r\nLast Packet Send Status:\t);Serial.println(status ESP_NOW_SEND_SUCCESS ? Delivery Success : Delivery Fail);
}// 回调函数当接收到消息时会调用该函数
void OnDataRecv(const uint8_t *mac, const uint8_t *incomingData, int len){memcpy(rcv_msg, incomingData, sizeof(rcv_msg));Serial.print(Bytes received: );Serial.println(len);Serial.print(Char: );Serial.print(rcv_msg.a);Serial.print(Int: );Serial.println(rcv_msg.b);Serial.print(float: );Serial.println(rcv_msg.c);Serial.print(Bool: );Serial.println(rcv_msg.d);Serial.println();
}esp_now_peer_info_t peerInfo1;esp_now_peer_info_t peerInfo3;void setup() {// put your setup code here, to run once:Serial.begin(115200);WiFi.mode(WIFI_STA);Serial.println(WiFi.macAddress());if(esp_now_init() ! ESP_OK) {Serial.println(Error init ESP-NOW);return;}esp_now_register_recv_cb(OnDataRecv); //注册接收信息回调函数esp_now_register_send_cb(OnDataSend);//设置通信频道//esp_now_peer_info_t peerInfo;memcpy(peerInfo1.peer_addr, broadcastAddress1, 6);peerInfo1.channel 1; //通道peerInfo1.encrypt false;if(esp_now_add_peer(peerInfo1) ! ESP_OK) {Serial.println(Failed to add peer);return;}memcpy(peerInfo3.peer_addr, broadcastAddress3, 6);peerInfo3.channel 1; //通道peerInfo3.encrypt false;if(esp_now_add_peer(peerInfo3) ! ESP_OK) {Serial.println(Failed to add peer);return;}
}void loop() {// put your main code here, to run repeatedly:strcpy(send_msg.a, this is a slaver);send_msg.b random(1,50);send_msg.c 20.0f;send_msg.d true;esp_err_t result esp_now_send(0, (uint8_t *)send_msg, sizeof(send_msg));if(result ESP_OK){Serial.println(Send with success);} else {Serial.println(Error sending the data);}delay(200);
}
模块3
esp_now_3.ino
// 接收端程序
#include WiFi.h
#include esp_now.h//3作为发送1和2作为接收
uint8_t broadcastAddress1[] {0xA0,0xB7,0x65,0x4F,0x27,0x30};
uint8_t broadcastAddress2[] {0xA0,0xB7,0x65,0x60,0xE7,0xB8};
uint8_t broadcastAddress3[] {0xA0,0xB7,0x65,0x48,0x78,0x9C};//A0:B7:65:48:78:9Ctypedef struct {char a[32];int b;float c;bool d;
}Message_t;Message_t send_msg, rcv_msg;void OnDataSend(const uint8_t *mac_addr, esp_now_send_status_t status) {Serial.print(\r\nLast Packet Send Status:\t);Serial.println(status ESP_NOW_SEND_SUCCESS ? Delivery Success : Delivery Fail);
}// 回调函数当接收到消息时会调用该函数
void OnDataRecv(const uint8_t *mac, const uint8_t *incomingData, int len){memcpy(rcv_msg, incomingData, sizeof(rcv_msg));Serial.print(Bytes received: );Serial.println(len);Serial.print(Char: );Serial.print(rcv_msg.a);Serial.print(Int: );Serial.println(rcv_msg.b);Serial.print(float: );Serial.println(rcv_msg.c);Serial.print(Bool: );Serial.println(rcv_msg.d);Serial.println();
}esp_now_peer_info_t peerInfo1;esp_now_peer_info_t peerInfo2;void setup() {// put your setup code here, to run once:Serial.begin(115200);WiFi.mode(WIFI_STA);Serial.println(WiFi.macAddress());if(esp_now_init() ! ESP_OK) {Serial.println(Error init ESP-NOW);return;}esp_now_register_recv_cb(OnDataRecv); //注册接收信息回调函数esp_now_register_send_cb(OnDataSend);//设置通信频道//esp_now_peer_info_t peerInfo;memcpy(peerInfo1.peer_addr, broadcastAddress1, 6);peerInfo1.channel 1; //通道peerInfo1.encrypt false;if(esp_now_add_peer(peerInfo1) ! ESP_OK) {Serial.println(Failed to add peer);return;}memcpy(peerInfo2.peer_addr, broadcastAddress2, 6);peerInfo2.channel 1; //通道peerInfo2.encrypt false;if(esp_now_add_peer(peerInfo2) ! ESP_OK) {Serial.println(Failed to add peer);return;}
}void loop() {// put your main code here, to run repeatedly:strcpy(send_msg.a, this is a slaver);send_msg.b random(1,50);send_msg.c 30.0f;send_msg.d true;esp_err_t result esp_now_send(0, (uint8_t *)send_msg, sizeof(send_msg));if(result ESP_OK){Serial.println(Send with success);} else {Serial.println(Error sending the data);}delay(200);
}
广播通讯
参考链接https://dronebotworkshop.com/esp-now/中的Broadcast Mode章节
在这个模式下测试至少需要两个ESP32模块相对于上面的多对多通讯的实现而言这种方式可以不用提前配对且可以多个模块共用一套代码。当然广播通讯模式可也能会有一些问题例如有些产品通过网络广播的形式形成了一个网络可能会受到其它网络通过广播模式发数据的影响具体的情况还需还要根据实际的应用来考虑。
这里通过广播模式每隔0.5S发送一次hello world可以通过MAC地址确定对应的信息是由哪个模块发送来的。
esp_now_broadcast.ino
#include WiFi.h
#include esp_now.hvoid formatMacAddress(const uint8_t *macAddr, char *buffer, int maxLength){snprintf(buffer, maxLength, %02X:%02X:%02X:%02X:%02X:%02X, macAddr[0], macAddr[1], macAddr[2], macAddr[3], macAddr[4], macAddr[5]);
}void receiveCallback(const uint8_t *macAddr, const uint8_t *data, int dataLen) {// 将接收到的数据复制到缓存中最大允许250个字节 1个null终止字节char buffer[ESP_NOW_MAX_DATA_LEN1];int msgLen min(ESP_NOW_MAX_DATA_LEN, dataLen);strncpy(buffer, (const char *)data, msgLen);buffer[msgLen] 0; //确保最后一个字节为nullchar macStr[18];formatMacAddress(macAddr, macStr, 18);Serial.printf(Received message from: %s - %s, macStr, buffer);
}void sendCallback(const uint8_t *macAddr, esp_now_send_status_t status) {char macStr[18];formatMacAddress(macAddr, macStr, 18);Serial.print(Last Packet Send to: );Serial.println(macStr);Serial.println(status ESP_NOW_SEND_SUCCESS ? Delivery Success : Delivery Fail);
}esp_now_peer_info_t peerInfo {};
uint8_t broadcastAddress[] {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};void broadcast(const String message) {// uint8_t broadcastAddress[] {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};// esp_now_peer_info_t peerInfo {};memcpy(peerInfo.peer_addr, broadcastAddress, 6);if(!esp_now_is_peer_exist(broadcastAddress)) {esp_now_add_peer(peerInfo);}esp_err_t result esp_now_send(peerInfo.peer_addr, (const uint8_t *)message.c_str(), message.length());if(result ESP_OK) {Serial.println(Broadcast message success);} else if(result ESP_ERR_ESPNOW_NOT_INIT) {Serial.println(ESP-NOW not Init);} else if(result ESP_ERR_ESPNOW_ARG) {Serial.println(Invalid Argument);} else if(result ESP_ERR_ESPNOW_INTERNAL) {Serial.println(Internal Error);} else if(result ESP_ERR_ESPNOW_NO_MEM) {Serial.println(ESP_ERR_ESPNOW_NO_MEM);} else if(result ESP_ERR_ESPNOW_NOT_FOUND) {Serial.println(Peer not found);} else {Serial.println(Unknown error);}
}void setup() {// put your setup code here, to run once:Serial.begin(115200);delay(1000);WiFi.mode(WIFI_STA);Serial.println(ESP-NOW Broadcast Demo);Serial.print(MAC Address: );Serial.println(WiFi.macAddress());WiFi.disconnect();if(esp_now_init() ESP_OK) {Serial.println(ESP-NOW init success);esp_now_register_recv_cb(receiveCallback);esp_now_register_send_cb(sendCallback);} else {Serial.println(ESP-NOW init failed);delay(3000);ESP.restart();}
}void loop() {// put your main code here, to run repeatedly:broadcast(hello world!);delay(500);
}
基于ESP-IDF框架
github上找到的基于网状网络的ESP-NOW协议组件https://github.com/aZholtikov/zh_network/tree/main
无需配对即可进行数据传输支持广播模式和单播模式… 详细的说明可到链接地址查看后续有时间可以研究下。
后续内容待添加。。。
