Hi3861_WiFi IoT工程：WiFi自动连接 原创 精华

hi_void app_main(hi_void)
{
#if defined(CONFIG_AT_COMMAND) || defined(CONFIG_FACTORY_TEST_MODE)     //AT指令模块的初始化。如果初始化成功，则开始注册各类AT指令。
    ret = hi_at_init();       // @//vendor/hisi/hi3861/hi3861/components/at/src/hi_at.c
    if (ret == HI_ERR_SUCCESS) {
        hi_at_sys_cmd_register();      // 同上 hi_at.c
    }
#endif
}
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hi_void hi_at_sys_cmd_register(hi_void)
{
    //vendor/hisi/hi3861/hi3861/components/at/src/at_general.c
    hi_at_general_cmd_register();
	
#ifndef CONFIG_FACTORY_TEST_MODE
    //vendor/hisi/hi3861/hi3861/components/at/src/at_wifi.c
    hi_at_sta_cmd_register();
    hi_at_softap_cmd_register();  //同上 at_wifi.c
#endif
    //vendor/hisi/hi3861/hi3861/components/at/src/at_hipriv.c
    hi_at_hipriv_cmd_register();

#ifndef CONFIG_FACTORY_TEST_MODE
#ifdef LOSCFG_APP_MESH
    hi_at_mesh_cmd_register();     //同上 at_wifi.c
#endif
    //vendor/hisi/hi3861/hi3861/components/at/src/at_lowpower.c
    hi_at_lowpower_cmd_register();
#endif

    hi_at_general_factory_test_cmd_register();      //同上 at_general.c
    hi_at_sta_factory_test_cmd_register();          //同上 at_wifi.c
    hi_at_hipriv_factory_test_cmd_register();       //同上 at_hipriv.c
    //vendor/hisi/hi3861/hi3861/components/at/src/at_io.c
    hi_at_io_cmd_register();
}
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#include "hi_wifi_api.h"
#include "lwip/netifapi.h"

void WifiLink(void)  
{
    static BOOL fgWifiConnected = FALSE;
			
    if(fgWifiConnected)   //防止重复连接WiFi
        return;

    printf("[WifiLink] Begin: fgWifiConnected[F]\n");
	
    //step 1: AT+STARTSTA   
    // #启动STA模式
    char ifname[WIFI_IFNAME_MAX_SIZE] = {0};  //“wlan0”
    int len = WIFI_IFNAME_MAX_SIZE;	

    if (HISI_OK != hi_wifi_sta_start(ifname, &len)) 
    {
        printf("[WifiLink] hi_wifi_sta_start fail\n");
        return;
    }

    //step 2: AT+CONN="SSID", ,2,"PASSWORD"
    //# 连接指定AP，其中SSID/PASSWORD为待连接的热点名称和密码
    hi_wifi_assoc_request request = {0};
    request.auth = HI_WIFI_SECURITY_WPA2PSK; //2

    char* ssid = "SSID";          //Your SSID, HI_WIFI_MAX_SSID_LEN 32 Byte
    char* pswd = "PASSWORD";      //Your PSWD, HI_WIFI_MAX_KEY_LEN  64 Byte

    memcpy(request.ssid, ssid, strlen(ssid));
    memcpy(request.key, pswd, strlen(pswd));
    
    if (HISI_OK != hi_wifi_sta_connect(&request)) 
    {
        printf("[wifilink] hi_wifi_sta_connect fail\n");
        return;
    }

    //step 3: AT+DHCP=wlan0,1  
    //# 通过DHCP向AP请求wlan0的IP地址
    struct netif* p_netif = netifapi_netif_find(ifname);
    if(NULL == p_netif) 
    {
        printf("[WifiLink] netifapi_netif_find fail\n");
        return;
    }	
	
#if 1  //DHCP 自动分配IP
    if(HISI_OK != netifapi_dhcp_start(p_netif)) 
    {
        printf("[WifiLink] netifapi_dhcp_start fail\n");
        return;
    }	
#else  //设置固定 IP
    ip4_addr_t gw;
    ip4_addr_t ipaddr;
    ip4_addr_t netmask;
    IP4_ADDR(&gw,      192, 168,  1, 1);
    IP4_ADDR(&ipaddr,  192, 168,  1, 200);   //固定到这个 IP 
    IP4_ADDR(&netmask, 255, 255, 255, 0);

    if (HISI_OK != netifapi_netif_set_addr(p_netif, &ipaddr, &netmask, &gw)) 
    {
        printf("[WifiLink] netifapi_netif_set_addr fail\n");
        return;
    }

    if (HISI_OK != hi_wifi_start_connect()) 
    {
        printf("[WifiLink] hi_wifi_start_connect fail\n");
        return;
    }
#endif
	
    fgWifiConnected = TRUE;
    printf("[WifiLink] End.   fgWifiConnected[T]\n");

    return;
}
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