esp8266 用sdk发送连接响应给Onenet云平台（EDP协议）

使用ESP8266的SDK连接到Onenet云平台（EDP协议）并不复杂。下面是一个基本的示例代码，你可以根据自己的需求进行调整。

#include <esp8266.h>
#include "ets_sys.h"
#include "os_type.h"
#include "osapi.h"
#include "user_interface.h"
#include "mem.h"

#define EDP_VERSION 0x01

// Onenet云平台的设备ID和APIKEY
#define DEVICE_ID "your_device_id"
#define API_KEY "your_api_key"

// Onenet云平台的服务器地址和端口号
#define SERVER_IP "183.230.40.33"
#define SERVER_PORT 876

// ESP8266的STA模式连接的WiFi网络的SSID和密码
#define WIFI_SSID "your_wifi_ssid"
#define WIFI_PASSWORD "your_wifi_password"

// 定义发送缓冲区大小
#define SEND_BUFFER_SIZE 512

// 发送缓冲区
char send_buf[SEND_BUFFER_SIZE];

// 连接状态
bool connected = false;

// 连接Onenet云平台
void connect_onenet() {
    // 连接到WiFi网络
    wifi_set_opmode(STATION_MODE);
    struct station_config stationConf;
    memset(&stationConf, 0, sizeof(stationConf));
    os_memcpy(&stationConf.ssid, WIFI_SSID, strlen(WIFI_SSID));
    os_memcpy(&stationConf.password, WIFI_PASSWORD, strlen(WIFI_PASSWORD));
    wifi_station_set_config(&stationConf);
    wifi_station_connect();

    // 创建TCP连接
    int tcp_fd = socket(AF_INET, SOCK_STREAM, 0);
    struct sockaddr_in server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = inet_addr(SERVER_IP);
    server_addr.sin_port = htons(SERVER_PORT);
    connect(tcp_fd, (struct sockaddr*)&server_addr, sizeof(server_addr));

    // 发送连接请求
    int len = 0;
    send_buf[len++] = EDP_VERSION;
    send_buf[len++] = 0x00;
    send_buf[len++] = strlen(DEVICE_ID);
    os_memcpy(send_buf + len, DEVICE_ID, strlen(DEVICE_ID));
    len += strlen(DEVICE_ID);
    send_buf[len++] = strlen(API_KEY);
    os_memcpy(send_buf + len, API_KEY, strlen(API_KEY));
    len += strlen(API_KEY);
    send(tcp_fd, send_buf, len, 0);

    // 等待连接响应
    uint8_t recv_buf[1024];
    int recv_len = recv(tcp_fd, recv_buf, sizeof(recv_buf), 0);
    if (recv_len > 0) {
        int packet_len = 0;
        uint8_t version = recv_buf[packet_len++];
        uint8_t flag = recv_buf[packet_len