【HarmonyOS HiSpark Wi-Fi IoT套件】Wifi操作，热点连接

https://bbs.elecfans.com/jishu_1994822_1_1.html

原文链接：https://bbs.elecfans.com/jishu_1994822_1_1.html

Hi3861 WiFi操作，热点连接
之前我们使用Hi3861的时候，是使用AT指令连接到WiFi热点的。例如：

但是很多时候，我们需要实现开机后自动连接到某个热点，光靠AT指令不行。
Hi3861 为我们提供了WiFi操作的相关API，方便我们编写代码，实现热点连接。

1.代码实现
先直接上代码和操作演示。
跟我们最早的hello world代码一样，在app下新增业务wifi_demo，其中hello_world.c为业务代码，BUILD.gn为编译脚本，具体规划目录结构如下：
.
└── applications
└── sample
      └── wifi-iot
         └── app
            │── wifi_demo
            │  │── wifi_demo.c
            │  └── BUILD.gn
            └── BUILD.gn

Wifi_demo.c 代码如下：

#include
#include
#include "ohos_init.h"
#include "cmsis_os2.h"
#include
#include "hi_wifi_api.h"
//#include "wifi_sta.h"
#include "lwip/ip_addr.h"
#include "lwip/netifapi.h"
#define APP_INIT_VAP_NUM 2
#define APP_INIT_USR_NUM 2
static struct netif *g_lwip_netif = NULL;
/* clear netif's ip, gateway and netmask */
void hi_sta_reset_addr(struct netif *pst_lwip_netif)
{
ip4_addr_t st_gw;
ip4_addr_t st_ipaddr;
ip4_addr_t st_netmask;
printf("%s %d rn", __FILE__, __LINE__);
if (pst_lwip_netif == NULL) {
printf("hisi_reset_addr::Null param of netdevrn");
return;
}
IP4_ADDR(&st_gw, 0, 0, 0, 0);
IP4_ADDR(&st_ipaddr, 0, 0, 0, 0);
IP4_ADDR(&st_netmask, 0, 0, 0, 0);
netifapi_netif_set_addr(pst_lwip_netif, &st_ipaddr, &st_netmask, &st_gw);
}
void wifi_wpa_event_cb(const hi_wifi_event *hisi_event)
{
if (hisi_event == NULL)
return;
switch (hisi_event->event) {
case HI_WIFI_EVT_SCAN_DONE:
printf("WiFi: Scan results availablen");
break;
case HI_WIFI_EVT_CONNECTED:
printf("WiFi: Connectedn");
netifapi_dhcp_start(g_lwip_netif);
break;
case HI_WIFI_EVT_DISCONNECTED:
printf("WiFi: Disconnectedn");
netifapi_dhcp_stop(g_lwip_netif);
hi_sta_reset_addr(g_lwip_netif);
break;
case HI_WIFI_EVT_WPS_TIMEOUT:
printf("WiFi: wps is timeoutn");
break;
default:
break;
}
}
int hi_wifi_start_connect(void)
{
int ret;
errno_t rc;
hi_wifi_assoc_request assoc_req = {0};
/* copy SSID to assoc_req */
//热点名称
rc = memcpy_s(assoc_req.ssid, HI_WIFI_MAX_SSID_LEN + 1, "15919500", 8); /* 9:ssid length */
if (rc != EOK) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
/*
* OPEN mode
* for WPA2-PSK mode:
* set assoc_req.auth as HI_WIFI_SECURITY_WPA2PSK,
* then memcpy(assoc_req.key, "12345678", 8).
*/
//热点加密方式
assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
/* 热点密码 */
memcpy(assoc_req.key, "11206582488", 11);
ret = hi_wifi_sta_connect(&assoc_req);
if (ret != HISI_OK) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
printf("%s %d rn", __FILE__, __LINE__);
return 0;
}
int hi_wifi_start_sta(void)
{
int ret;
char ifname[WIFI_IFNAME_MAX_SIZE + 1] = {0};
int len = sizeof(ifname);
const unsigned char wifi_vap_res_num = APP_INIT_VAP_NUM;
const unsigned char wifi_user_res_num = APP_INIT_USR_NUM;
unsigned int num = WIFI_SCAN_AP_LIMIT;
printf("%s %d rn", __FILE__, __LINE__);
ret = hi_wifi_init(wifi_vap_res_num, wifi_user_res_num);
if (ret != HISI_OK) {
printf("%s %d rn", __FILE__, __LINE__);
//return -1;
}
printf("%s %d rn", __FILE__, __LINE__);
ret = hi_wifi_sta_start(ifname, &len);
if (ret != HISI_OK) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
/* register call back function to receive wifi event, etc scan results event,
* connected event, disconnected event.
*/
ret = hi_wifi_register_event_callback(wifi_wpa_event_cb);
if (ret != HISI_OK) {
printf("register wifi event callback faiLEDn");
}
/* acquire netif for IP operation */
g_lwip_netif = netifapi_netif_find(ifname);
if (g_lwip_netif == NULL) {
printf("%s: get netif failedn", __FUNCTION__);
return -1;
}
/* start scan, scan results event will be received soon */
ret = hi_wifi_sta_scan();
if (ret != HISI_OK) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
sleep(5); /* sleep 5s, waiting for scan result. */
hi_wifi_ap_info *pst_results = malloc(sizeof(hi_wifi_ap_info) * WIFI_SCAN_AP_LIMIT);
if (pst_results == NULL) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
ret = hi_wifi_sta_scan_results(pst_results, &num);
if (ret != HISI_OK) {
printf("%s %d rn", __FILE__, __LINE__);
free(pst_results);
return -1;
}
for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {
printf("SSID: %sn", pst_results[loop].ssid);
}
free(pst_results);
/* if received scan results, select one SSID to connect */
ret = hi_wifi_start_connect();
if (ret != 0) {
printf("%s %d rn", __FILE__, __LINE__);
return -1;
}
return 0;
}
void hi_wifi_stop_sta(void)
{
int ret;
ret = hi_wifi_sta_stop();
if (ret != HISI_OK) {
printf("failed to stop stan");
}
ret = hi_wifi_deinit();
if (ret != HISI_OK) {
printf("failed to deinit wifin");
}
g_lwip_netif = NULL;
}
void WiFiExampleEntry(void)
{
hi_wifi_start_sta();
}
SYS_RUN(WiFiExampleEntry);

复制代码

Wifi_demo目录下的BUILD.gn文件内容如下：
static_library("wifi_demo") {
sources = [
      "wifi_demo.c"
]

include_dirs = [
      "//utils/native/lite/include",
      "//kernel/liteos_m/components/cmsis/2.0",
      "//base/iot_hardware/inteRFaces/kits/wifiiot_lite",
      "//vendor/hisi/hi3861/hi3861/third_party/lwip_sack/include",
      "//foundation/communication/interfaces/kits/wifi_lite/wifiservice",

]
}

app目录下的BUILD.gn文件内容修改如下：
import("//build/lite/config/component/lite_component.gni")

lite_component("app") {
features = [
      "wifi_demo:wifi_demo",
]
}

编译烧录，查看串口数据：

可以看到有打印扫描到的热点名称：

SSID: 15919500

SSID: Netcore_FD55A7

同时最后打印：WiFi: Connected 成功连接上热点。

2.wifi api接口说明

Hi3861 提供了非常多的wifi相关API，主要文件是 hi_wifi_api.h

我们这里只列举最重要的几个API

（1）开启STA

int hi_wifi_sta_start(char *ifname, int *len);

（2）停止STA

int hi_wifi_sta_stop(void);

扫描附件的热点

int hi_wifi_sta_scan(void);

（4）连接热点

int hi_wifi_sta_connect(hi_wifi_assoc_request *req);

其中hi_wifi_assoc_request *req 结构的定义如下：

这里需要注意的是，通常加密方式是：HI_WIFI_SECURITY_WPA2PSK

例如我家的热点的连接方式的代码实现如下：

/* copy SSID to assoc_req */

复制代码

搜索历史

【HarmonyOS HiSpark Wi-Fi IoT套件】Wifi操作，热点连接

相关推荐

精选推荐

最新话题

热门话题

创建小组步骤

站长推荐 /6