HI3861L 使用coap的示例
时间: 2023-12-31 17:07:12 浏览: 38
HI3861L是华为公司推出的一款低功耗Wi-Fi芯片,支持CoAP协议。下面是一个使用CoAP协议的示例:
1. 配置CoAP客户端
```c
#include "coap.h"
#include "lwip/sockets.h"
// 定义CoAP客户端结构体
static coap_client_t client;
// 定义接收缓冲区和发送缓冲区
static uint8_t recv_buf[1024];
static uint8_t send_buf[1024];
// CoAP客户端初始化函数
void coap_client_init(void)
{
memset(&client, 0, sizeof(coap_client_t));
client.fd = -1;
client.port = COAP_DEFAULT_PORT;
client.buf = recv_buf;
client.buf_len = sizeof(recv_buf);
client.version = COAP_VERSION;
client.block_size = COAP_BLOCK_1024;
client.timeout = COAP_DEFAULT_TIMEOUT_MS;
client.is_used = false;
}
// CoAP客户端发送请求函数
int coap_client_send(coap_method_t method, const char *url, const uint8_t *payload, uint16_t payload_len)
{
struct sockaddr_in6 addr = {0};
coap_pdu_t pdu = {0};
int ret;
// 解析URL
ret = coap_parse_url(url, &client.uri);
if (ret != 0) {
return ret;
}
// 打开套接字
client.fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
if (client.fd < 0) {
return -1;
}
// 配置目标地址
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_port = htons(client.port);
memcpy(&addr.sin6_addr, &client.uri.host, sizeof(addr.sin6_addr));
// 构造CoAP PDU
coap_pdu_init(&pdu);
pdu.type = COAP_MESSAGE_CON;
pdu.code = method;
pdu.mid = coap_get_mid();
pdu.token_len = 0;
pdu.uri_path = client.uri.path;
pdu.uri_path_len = client.uri.path_len;
pdu.payload = payload;
pdu.payload_len = payload_len;
pdu.block_size = client.block_size;
// 序列化CoAP PDU
coap_serialize(&client, &pdu, send_buf, sizeof(send_buf));
// 发送CoAP请求
ret = sendto(client.fd, send_buf, pdu.buf_len, 0, (struct sockaddr *)&addr, sizeof(addr));
if (ret < 0) {
close(client.fd);
return -1;
}
// 等待CoAP响应
ret = coap_wait_response(&client, &pdu);
if (ret != 0) {
close(client.fd);
return ret;
}
// 解析CoAP响应
coap_parse(&pdu, recv_buf, pdu.buf_len);
// 关闭套接字
close(client.fd);
return 0;
}
```
2. 使用CoAP客户端发送请求
```c
coap_client_init();
// 发送GET请求
coap_client_send(COAP_GET, "coap://example.com/resource", NULL, 0);
// 发送POST请求
const char *payload = "hello";
coap_client_send(COAP_POST, "coap://example.com/resource", (uint8_t *)payload, strlen(payload));
```
以上示例代码仅供参考,具体实现需要根据实际情况进行调整。
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