OpenHarmony轻量系统研发WiFi之STA模式连接热点

       摘要：本文简单介绍Hi3861WiFi操作，怎么连接到热点，查看IP，ping服务器等
 
        适合群体：适用于润和Hi3861开发板
  
 AT指令操作WiFi
我们可以使用AT指令进行Hi3861 WiFi操作，连接热点、ping服务器等。
  
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。
 
其中BUILD.gn文件内容如下：
 
复制
static_library("demo_wifi_sta") {
    sources = [
        "demo_wifi_sta.c"
    ]
 
    include_dirs = [
        "//utils/native/lite/include",
        "//kernel/liteos_m/components/cmsis/2.0",
        "//base/iot_hardware/peripheral/interfaces/kits",
        "//device/soc/hisilicon/hi3861v100/hi3861_adapter/hals/communication/wifi_lite/wifiservice",
        "//device/soc/hisilicon/hi3861v100/hi3861_adapter/kal",
        "//device/soc/hisilicon/hi3861v100/sdk_liteos/third_party/lwip_sack/include",
    ]
}
 
hi_wifi_start_sta函数：设置WiFi参数、扫描热点
 
复制
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;
 
    //这里不需要重复进行WiFi init，因为系统启动后就自己会做WiFi init
#if 0
    printf("_______>>>>>>>>>> %s %d \r\n", __FILE__, __LINE__);
    ret = hi_wifi_init(wifi_vap_res_num, wifi_user_res_num);
    if (ret != HISI_OK) {
        return -1;
    }
#endif
    ret = hi_wifi_sta_start(ifname, &len);
    if (ret != HISI_OK) {
        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 failed\n");
    }
 
    /* acquire netif for IP operation */
    g_lwip_netif = netifapi_netif_find(ifname);
    if (g_lwip_netif == NULL) {
        printf("%s: get netif failed\n", __FUNCTION__);
        return -1;
    }
 
    /* 开始扫描附件的WiFi热点 */
    ret = hi_wifi_sta_scan();
    if (ret != HISI_OK) {
        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) {
        return -1;
    }
 
    //把扫描到的热点结果存储起来
    ret = hi_wifi_sta_scan_results(pst_results, &num);
    if (ret != HISI_OK) {
        free(pst_results);
        return -1;
    }
 
    //打印扫描到的所有热点
    for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {
        printf("SSID: %s\n", pst_results[loop].ssid);
    }
    free(pst_results);
 
    /* 开始接入热点 */
    ret = hi_wifi_start_connect();
    if (ret != 0) {
        return -1;
    }
    return 0;
}
 
连接热点：
 
复制
int hi_wifi_start_connect(void)
{
    int ret;
    errno_t rc;
    hi_wifi_assoc_request assoc_req = {0};
 
    /* copy SSID to assoc_req */
    rc = memcpy_s(assoc_req.ssid, HI_WIFI_MAX_SSID_LEN + 1, "RedmiK40", 8); /* 9:ssid length */
    if (rc != EOK) {
        return -1;
    }
 
    //热点加密方式
    assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
 
    /* 热点密码 */
    memcpy(assoc_req.key, "07686582488", 11);
 
    ret = hi_wifi_sta_connect(&assoc_req);
    if (ret != HISI_OK) {
        return -1;
    }
 
    return 0;
}
 
热点连接结果回调函数。