OpenHarmony輕量系統(tǒng)開發(fā)WiFi之STA模式連接熱點(diǎn)
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摘要：本文簡(jiǎn)單介紹Hi3861WiFi操作，怎么連接到熱點(diǎn)，查看IP，ping服務(wù)器等
適合群體：適用于潤(rùn)和Hi3861開發(fā)板
文中所有代碼倉庫：https://gitee.com/qidiyun/hihope-3861-smart-home-kit
9.1AT指令操作WiFi
我們可以使用AT指令進(jìn)行Hi3861 WiFi操作，連接熱點(diǎn)、ping服務(wù)器等。
但是很多時(shí)候，我們需要實(shí)現(xiàn)開機(jī)后自動(dòng)連接到某個(gè)熱點(diǎn)，光靠AT指令不行。
Hi3861 為我們提供了WiFi操作的相關(guān)API，方便我們編寫代碼，實(shí)現(xiàn)熱點(diǎn)連接。
9.2 代碼實(shí)現(xiàn)
先直接上代碼和操作演示。
跟我們最早的hello world代碼一樣，在app下新增業(yè)務(wù)demo_wifi_sta，其中demo_wifi_sta.c為業(yè)務(wù)代碼，BUILD.gn為編譯腳本，具體規(guī)劃目錄結(jié)構(gòu)如下：
其中BUILD.gn文件內(nèi)容如下：
static_library("demo_wifi_sta") {
sources = [
"demo_wifi_sta.c"
]
include_dirs = [
"http://utils/native/lite/include",
"http://kernel/liteos_m/components/cmsis/2.0",
"http://base/iot_hardware/peripheral/interfaces/kits",
"http://device/soc/hisilicon/hi3861v100/hi3861_adapter/hals/communication/wifi_lite/wifiservice",
"http://device/soc/hisilicon/hi3861v100/hi3861_adapter/kal",
"http://device/soc/hisilicon/hi3861v100/sdk_liteos/third_party/lwip_sack/include",
]
}hi_wifi_start_sta函數(shù)：設(shè)置WiFi參數(shù)、掃描熱點(diǎn)
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;
//這里不需要重復(fù)進(jìn)行WiFi init，因?yàn)橄到y(tǒng)啟動(dòng)后就自己會(huì)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;
}
/* 開始掃描附件的WiFi熱點(diǎn) */
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;
}
//把掃描到的熱點(diǎn)結(jié)果存儲(chǔ)起來
ret = hi_wifi_sta_scan_results(pst_results, &num);
if (ret != HISI_OK) {
free(pst_results);
return -1;
}
//打印掃描到的所有熱點(diǎn)
for (unsigned int loop = 0; (loop < num) && (loop < WIFI_SCAN_AP_LIMIT); loop++) {
printf("SSID: %s\n", pst_results[loop].ssid);
}
free(pst_results);
/* 開始接入熱點(diǎn) */
ret = hi_wifi_start_connect();
if (ret != 0) {
return -1;
}
return 0;
}
連接熱點(diǎn)：
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;
}
//熱點(diǎn)加密方式
assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
/* 熱點(diǎn)密碼 */
memcpy(assoc_req.key, "07686582488", 11);
ret = hi_wifi_sta_connect(&assoc_req);
if (ret != HISI_OK) {
return -1;
}
return 0;
}
熱點(diǎn)連接結(jié)果回調(diào)函數(shù)
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 available\n");
break;
case HI_WIFI_EVT_CONNECTED:
printf("WiFi: Connected\n");
netifapi_dhcp_start(g_lwip_netif);
break;
case HI_WIFI_EVT_DISCONNECTED:
printf("WiFi: Disconnected\n");
netifapi_dhcp_stop(g_lwip_netif);
hi_sta_reset_addr(g_lwip_netif);
break;
case HI_WIFI_EVT_WPS_TIMEOUT:
printf("WiFi: wps is timeout\n");
break;
default:
break;
}
}
hi_sta_reset_addr：重新復(fù)位sta的地址、網(wǎng)關(guān)等參數(shù)。
/* 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;
if (pst_lwip_netif == NULL) {
printf("hisi_reset_addr::Null param of netdev\r\n");
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);
}
9.3 WiFi相關(guān)API
Hi3861 提供了非常多的wifi相關(guān)API，主要文件是 hi_wifi_api.h
我們這里只列舉最重要的幾個(gè)API
(1)開啟STA
int hi_wifi_sta_start(char *ifname, int *len);
(2)停止STA
int hi_wifi_sta_stop(void);
(3)掃描附件的熱點(diǎn)
int hi_wifi_sta_scan(void);
(4)連接熱點(diǎn)
int hi_wifi_sta_connect(hi_wifi_assoc_request *req);
其中hi_wifi_assoc_request *req 結(jié)構(gòu)的定義如下：
typedef struct {
char ssid[HI_WIFI_MAX_SSID_LEN + 1]; /**< SSID. CNcomment: SSID 只支持ASCII字符.CNend */
hi_wifi_auth_mode auth; /**< Authentication mode. CNcomment: 認(rèn)證類型.CNend */
char key[HI_WIFI_MAX_KEY_LEN + 1]; /**< Secret key. CNcomment: 秘鑰.CNend */
unsigned char bssid[HI_WIFI_MAC_LEN]; /**< BSSID. CNcomment: BSSID.CNend */
hi_wifi_pairwise pairwise; /**< Encryption type. CNcomment: 加密方式,不需指定時(shí)置0.CNend */
} hi_wifi_assoc_request;這里需要注意的是，通常加密方式是：HI_WIFI_SECURITY_WPA2PSK
例如我家的熱點(diǎn)的連接方式的代碼實(shí)現(xiàn)如下：
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;
}
//熱點(diǎn)加密方式
assoc_req.auth = HI_WIFI_SECURITY_WPA2PSK;
/* 熱點(diǎn)密碼 */
memcpy(assoc_req.key, "07686582488", 11);
ret = hi_wifi_sta_connect(&assoc_req);
if (ret != HISI_OK) {
return -1;
}
return 0;
}
??想了解更多內(nèi)容，請(qǐng)?jiān)L問：??
??51CTO和華為官方合作共建的鴻蒙技術(shù)社區(qū)??
??https://harmonyos.51cto.com??
