esp8266 用sdk编程上传数据点给Onenet云平台（EDP协议）

使用 ESP8266 SDK 编写程序上传数据点给 OneNet 云平台（EDP协议）的步骤如下：

1. 注册 OneNet 账号并创建产品和设备。

2. 下载 ESP8266 SDK，并在开发环境中配置好 SDK。

3. 在你的代码中添加以下头文件：

#include "ets_sys.h"
#include "osapi.h"
#include "user_interface.h"
#include "mem.h"
#include "espconn.h"

4. 定义以下变量：

#define SERVER "api.heclouds.com"          // OneNet 服务器地址
#define PORT 80                            // OneNet 服务器端口
#define DEVICE_ID "your_device_id"         // 设备 ID
#define API_KEY "your_api_key"             // 设备 API Key
#define DATA_STREAM "your_data_stream"     // 数据流名称
#define DATA_VALUE "your_data_value"       // 数据流值

5. 编写连接 OneNet 服务器的函数：

void ICACHE_FLASH_ATTR connect_to_server() {
    struct espconn conn;
    ip_addr_t ip;
    espconn_create(&conn);
    conn.type = ESPCONN_TCP;
    conn.state = ESPCONN_NONE;
    conn.proto.tcp = (esp_tcp *)os_zalloc(sizeof(esp_tcp));
    conn.proto.tcp->local_port = espconn_port();
    conn.proto.tcp->remote_port = PORT;
    conn.proto.tcp->remote_ip[0] = 183;
    conn.proto.tcp->remote_ip[1] = 230;
    conn.proto.tcp->remote_ip[2] = 40;
    conn.proto.tcp->remote_ip[3] = 39;
    espconn_regist_connectcb(&conn, connect_callback);
    espconn_regist_reconcb(&conn, reconnect_callback);
    espconn_connect(&conn);
}

6. 编写连接成功回调函数：

void ICACHE_FLASH_ATTR connect_callback(void *arg) {
    struct espconn *conn = (struct espconn *)arg;
    os_printf("Connected to server!\n");
    char data[300];
    os_sprintf(data, "{\"datastreams\":[{\"id\":\"%s\",\"datapoints\":[{\"value\":\"%s\"}]}]}", DATA_STREAM, DATA_VALUE);
    char content_length[10];
    os_sprintf(content_length, "%d", os_strlen(data));
    char header[200];
    os_sprintf(header, "POST /devices/%s/datapoints HTTP/1.1\r\napi-key: %s\r\nHost: %s:%d\r\nContent-Length: %s\r\nContent-Type: application/json\r\n\r\n%s", DEVICE_ID, API_KEY, SERVER, PORT, content_length, data);
    espconn_sent(conn, header, os_strlen(header));
}

7. 编写重连回调函数：

void ICACHE_FLASH_ATTR reconnect_callback(void *arg, sint8 err) {
    os_printf("Reconnecting to server...\n");
    connect_to_server();
}

8. 在你的程序中调用 `connect_to_server()` 函数即可上传数据点到 OneNet 云平台。

完整代码示例：

#include "ets_sys.h"
#include "osapi.h"
#include "user_interface.h"
#include "mem.h"
#include "espconn.h"

#define SERVER "api.heclouds.com"          // OneNet 服务器地址
#define PORT 80                            // OneNet 服务器端口
#define DEVICE_ID "your_device_id"         // 设备 ID
#define API_KEY "your_api_key"             // 设备 API Key
#define DATA_STREAM "your_data_stream"     // 数据流名称
#define DATA_VALUE "your_data_value"       // 数据流值

void ICACHE_FLASH_ATTR connect_to_server();
void ICACHE_FLASH_ATTR connect_callback(void *arg);
void ICACHE_FLASH_ATTR reconnect_callback(void *arg, sint8 err);

void ICACHE_FLASH_ATTR user_init() {
    uart_div_modify(0, UART_CLK_FREQ / 115200);
    os_printf("Starting...\n");
    wifi_set_opmode(STATION_MODE);
    struct station_config config;
    os_memset(&config, 0, sizeof(config));
    os_sprintf(config.ssid, "%s", "your_wifi_ssid");
    os_sprintf(config.password, "%s", "your_wifi_password");
    wifi_station_set_config(&config);
    wifi_station_connect();
    connect_to_server();
}

void ICACHE_FLASH_ATTR connect_to_server() {
    struct espconn conn;
    ip_addr_t ip;
    espconn_create(&conn);
    conn.type = ESPCONN_TCP;
    conn.state = ESPCONN_NONE;
    conn.proto.tcp = (esp_tcp *)os_zalloc(sizeof(esp_tcp));
    conn.proto.tcp->local_port = espconn_port();
    conn.proto.tcp->remote_port = PORT;
    conn.proto.tcp->remote_ip[0] = 183;
    conn.proto.tcp->remote_ip[1] = 230;
    conn.proto.tcp->remote_ip[2] = 40;
    conn.proto.tcp->remote_ip[3] = 39;
    espconn_regist_connectcb(&conn, connect_callback);
    espconn_regist_reconcb(&conn, reconnect_callback);
    espconn_connect(&conn);
}

void ICACHE_FLASH_ATTR connect_callback(void *arg) {
    struct espconn *conn = (struct espconn *)arg;
    os_printf("Connected to server!\n");
    char data[300];
    os_sprintf(data, "{\"datastreams\":[{\"id\":\"%s\",\"datapoints\":[{\"value\":\"%s\"}]}]}", DATA_STREAM, DATA_VALUE);
    char content_length[10];
    os_sprintf(content_length, "%d", os_strlen(data));
    char header[200];
    os_sprintf(header, "POST /devices/%s/datapoints HTTP/1.1\r\napi-key: %s\r\nHost: %s:%d\r\nContent-Length: %s\r\nContent-Type: application/json\r\n\r\n%s", DEVICE_ID, API_KEY, SERVER, PORT, content_length, data);
    espconn_sent(conn, header, os_strlen(header));
}

void ICACHE_FLASH_ATTR reconnect_callback(void *arg, sint8 err) {
    os_printf("Reconnecting to server...\n");
    connect_to_server();
}