梅科尔工作室-鸿蒙十四天实战培训笔记（day5）--无线联网开发

xiran61

发布于 2022-8-2 11:43

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WIFI AP热点

API介绍

wifi_hotspot.h接口简介

例程

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include “cmsis_os2.h”
#include “ohos_init.h”

#include “wifi_device.h”
#include “wifi_hotspot.h”
#include “wifi_error_code.h”
#include “lwip/netifapi.h”

#define AP_SSID “BearPi”
#define AP_PSK “0987654321”

#define ONE_SECOND 1
#define DEF_TIMEOUT 15

static void OnHotspotStaJoinHandler(StationInfo *info);
static void OnHotspotStateChangedHandler(int state);
static void OnHotspotStaLeaveHandler(StationInfo *info);

static struct netif *g_lwip_netif = NULL;
static int g_apEnableSuccess = 0;
WifiEvent g_wifiEventHandler = {0};
WifiErrorCode error;

static BOOL WifiAPTask(void)
{
//延时2S便于查看日志
osDelay(200);

//注册wifi事件的回调函数
g_wifiEventHandler.OnHotspotStaJoin = OnHotspotStaJoinHandler;
g_wifiEventHandler.OnHotspotStaLeave = OnHotspotStaLeaveHandler;
g_wifiEventHandler.OnHotspotStateChanged = OnHotspotStateChangedHandler;
error = RegisterWifiEvent(&g_wifiEventHandler);
if (error != WIFI_SUCCESS)
{
    printf("RegisterWifiEvent failed, error = %d.\r\n",error);
    return -1;
}
printf("RegisterWifiEvent succeed!\r\n");
//设置指定的热点配置
HotspotConfig config = {0};

strcpy(config.ssid, AP_SSID);
strcpy(config.preSharedKey, AP_PSK);
config.securityType = WIFI_SEC_TYPE_PSK;
config.band = HOTSPOT_BAND_TYPE_2G;
config.channelNum = 7;

error = SetHotspotConfig(&config);
if (error != WIFI_SUCCESS)
{
    printf("SetHotspotConfig failed, error = %d.\r\n", error);
    return -1;
}
printf("SetHotspotConfig succeed!\r\n");

//启动wifi热点模式
error = EnableHotspot(); 
if (error != WIFI_SUCCESS)
{
    printf("EnableHotspot failed, error = %d.\r\n", error);
    return -1;
}
printf("EnableHotspot succeed!\r\n");

//检查热点模式是否使能
if (IsHotspotActive() == WIFI_HOTSPOT_NOT_ACTIVE)
{
    printf("Wifi station is not actived.\r\n");
    return -1;
}
printf("Wifi station is actived!\r\n");

//启动dhcp
g_lwip_netif = netifapi_netif_find("ap0");
if (g_lwip_netif) 
{
    ip4_addr_t bp_gw;
    ip4_addr_t bp_ipaddr;
    ip4_addr_t bp_netmask;

    IP4_ADDR(&bp_gw, 192, 168, 1, 1);           /* input your gateway for example: 192.168.1.1 */
    IP4_ADDR(&bp_ipaddr, 192, 168, 1, 1);       /* input your IP for example: 192.168.1.1 */
    IP4_ADDR(&bp_netmask, 255, 255, 255, 0);    /* input your netmask for example: 255.255.255.0 */

    err_t ret = netifapi_netif_set_addr(g_lwip_netif, &bp_ipaddr, &bp_netmask, &bp_gw);
    if(ret != ERR_OK)
    {
        printf("netifapi_netif_set_addr failed, error = %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_netif_set_addr succeed!\r\n");

    ret = netifapi_dhcps_start(g_lwip_netif, 0, 0);
    if(ret != ERR_OK)
    { 
        printf("netifapi_dhcp_start failed, error = %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_dhcps_start succeed!\r\n");

}

/****************以下为UDP服务器代码***************/
//在sock_fd 进行监听
int sock_fd;
//服务端地址信息
struct sockaddr_in server_sock;

//创建socket
if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
	perror("socket is error.\r\n");
	return -1;
}

bzero(&server_sock, sizeof(server_sock));
server_sock.sin_family = AF_INET;
server_sock.sin_addr.s_addr = htonl(INADDR_ANY);
server_sock.sin_port = htons(8888);

//调用bind函数绑定socket和地址
if (bind(sock_fd, (struct sockaddr *)&server_sock, sizeof(struct sockaddr)) == -1)
{
	perror("bind is error.\r\n");
	return -1;
}

int ret;
char recvBuf[512] = {0};
//客户端地址信息
struct sockaddr_in client_addr;
int size_client_addr= sizeof(struct sockaddr_in);
while (1)
{
    
    printf("Waiting to receive data...\r\n");
    memset(recvBuf, 0, sizeof(recvBuf));
    ret = recvfrom(sock_fd, recvBuf, sizeof(recvBuf), 0, (struct sockaddr*)&client_addr,(socklen_t*)&size_client_addr);
    if(ret < 0)
    {
        printf("UDP server receive failed!\r\n");
        return -1;
    }
    printf("receive %d bytes of data from ipaddr = %s, port = %d.\r\n", ret, inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
    printf("data is %s\r\n",recvBuf);
    ret = sendto(sock_fd, recvBuf, strlen(recvBuf), 0, (struct sockaddr *)&client_addr, sizeof(client_addr));
    if (ret < 0)
    {
        printf("UDP server send failed!\r\n");
        return -1;
    }
}
/*********************END********************/
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}

static void HotspotStaJoinTask(void)
{
static char macAddress[32] = {0};
StationInfo stainfo[WIFI_MAX_STA_NUM] = {0};
StationInfo *sta_list_node = NULL;
unsigned int size = WIFI_MAX_STA_NUM;

error = GetStationList(stainfo, &size);
if (error != WIFI_SUCCESS) {
    printf("HotspotStaJoin:get list fail, error is %d.\r\n", error);
    return;
}
sta_list_node = stainfo;
for (uint32_t i = 0; i < size; i++, sta_list_node++) {
unsigned char* mac = sta_list_node->macAddress;
snprintf(macAddress, sizeof(macAddress), "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
printf("HotspotSta[%d]: macAddress=%s.\r\n",i, macAddress);
}
g_apEnableSuccess++;
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}
static void OnHotspotStaJoinHandler(StationInfo *info)
{
if (info == NULL) {
printf(“HotspotStaJoin:info is null.\r\n”);
}
else {
printf(“New Sta Join\n”);
osThreadAttr_t attr;
attr.name = “HotspotStaJoinTask”;
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 2048;
attr.priority = 24;
if (osThreadNew((osThreadFunc_t)HotspotStaJoinTask, NULL, &attr) == NULL) {
printf(“HotspotStaJoin:create task fail!\r\n”);
}
}
return;
}

static void OnHotspotStaLeaveHandler(StationInfo info)
{
if (info == NULL) {
printf(“HotspotStaLeave:info is null.\r\n”);
}
else {
static char macAddress[32] = {0};
unsigned char mac = info->macAddress;
snprintf(macAddress, sizeof(macAddress), “%02X:%02X:%02X:%02X:%02X:%02X”, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
printf(“HotspotStaLeave: macAddress=%s, reason=%d.\r\n”, macAddress, info->disconnectedReason);
g_apEnableSuccess–;
}
return;
}

static void OnHotspotStateChangedHandler(int state)
{
printf(“HotspotStateChanged:state is %d.\r\n”, state);
if (state == WIFI_HOTSPOT_ACTIVE) {
printf(“wifi hotspot active.\r\n”);
} else {
printf(“wifi hotspot noactive.\r\n”);
}
}

static void Wifi_AP_Demo(void)
{
osThreadAttr_t attr;

attr.name = "WifiAPTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 10240;
attr.priority = 25;

if (osThreadNew((osThreadFunc_t)WifiAPTask, NULL, &attr) == NULL)
{
    printf("Falied to create WifiAPTask!\r\n");
}
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}

APP_FEATURE_INIT(Wifi_AP_Demo);

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include “cmsis_os2.h”
#include “ohos_init.h”

#include “wifi_device.h”
#include “wifi_hotspot.h”
#include “wifi_error_code.h”
#include “lwip/netifapi.h”

#define AP_SSID “BearPi”
#define AP_PSK “0987654321”

#define ONE_SECOND 1
#define DEF_TIMEOUT 15

static void OnHotspotStaJoinHandler(StationInfo *info);
static void OnHotspotStateChangedHandler(int state);
static void OnHotspotStaLeaveHandler(StationInfo *info);

static struct netif *g_lwip_netif = NULL;
static int g_apEnableSuccess = 0;
WifiEvent g_wifiEventHandler = {0};
WifiErrorCode error;

static BOOL WifiAPTask(void)
{
//延时2S便于查看日志
osDelay(200);

//注册wifi事件的回调函数
g_wifiEventHandler.OnHotspotStaJoin = OnHotspotStaJoinHandler;
g_wifiEventHandler.OnHotspotStaLeave = OnHotspotStaLeaveHandler;
g_wifiEventHandler.OnHotspotStateChanged = OnHotspotStateChangedHandler;
error = RegisterWifiEvent(&g_wifiEventHandler);
if (error != WIFI_SUCCESS)
{
    printf("RegisterWifiEvent failed, error = %d.\r\n",error);
    return -1;
}
printf("RegisterWifiEvent succeed!\r\n");
//设置指定的热点配置
HotspotConfig config = {0};

strcpy(config.ssid, AP_SSID);
strcpy(config.preSharedKey, AP_PSK);
config.securityType = WIFI_SEC_TYPE_PSK;
config.band = HOTSPOT_BAND_TYPE_2G;
config.channelNum = 7;

error = SetHotspotConfig(&config);
if (error != WIFI_SUCCESS)
{
    printf("SetHotspotConfig failed, error = %d.\r\n", error);
    return -1;
}
printf("SetHotspotConfig succeed!\r\n");

//启动wifi热点模式
error = EnableHotspot(); 
if (error != WIFI_SUCCESS)
{
    printf("EnableHotspot failed, error = %d.\r\n", error);
    return -1;
}
printf("EnableHotspot succeed!\r\n");

//检查热点模式是否使能
if (IsHotspotActive() == WIFI_HOTSPOT_NOT_ACTIVE)
{
    printf("Wifi station is not actived.\r\n");
    return -1;
}
printf("Wifi station is actived!\r\n");

//启动dhcp
g_lwip_netif = netifapi_netif_find("ap0");
if (g_lwip_netif) 
{
    ip4_addr_t bp_gw;
    ip4_addr_t bp_ipaddr;
    ip4_addr_t bp_netmask;

    IP4_ADDR(&bp_gw, 192, 168, 1, 1);           /* input your gateway for example: 192.168.1.1 */
    IP4_ADDR(&bp_ipaddr, 192, 168, 1, 1);       /* input your IP for example: 192.168.1.1 */
    IP4_ADDR(&bp_netmask, 255, 255, 255, 0);    /* input your netmask for example: 255.255.255.0 */

    err_t ret = netifapi_netif_set_addr(g_lwip_netif, &bp_ipaddr, &bp_netmask, &bp_gw);
    if(ret != ERR_OK)
    {
        printf("netifapi_netif_set_addr failed, error = %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_netif_set_addr succeed!\r\n");

    ret = netifapi_dhcps_start(g_lwip_netif, 0, 0);
    if(ret != ERR_OK)
    { 
        printf("netifapi_dhcp_start failed, error = %d.\r\n", ret);
        return -1;
    }
    printf("netifapi_dhcps_start succeed!\r\n");

}

/****************以下为UDP服务器代码***************/
//在sock_fd 进行监听
int sock_fd;
//服务端地址信息
struct sockaddr_in server_sock;

//创建socket
if ((sock_fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
{
	perror("socket is error.\r\n");
	return -1;
}

bzero(&server_sock, sizeof(server_sock));
server_sock.sin_family = AF_INET;
server_sock.sin_addr.s_addr = htonl(INADDR_ANY);
server_sock.sin_port = htons(8888);

//调用bind函数绑定socket和地址
if (bind(sock_fd, (struct sockaddr *)&server_sock, sizeof(struct sockaddr)) == -1)
{
	perror("bind is error.\r\n");
	return -1;
}

int ret;
char recvBuf[512] = {0};
//客户端地址信息
struct sockaddr_in client_addr;
int size_client_addr= sizeof(struct sockaddr_in);
while (1)
{
    
    printf("Waiting to receive data...\r\n");
    memset(recvBuf, 0, sizeof(recvBuf));
    ret = recvfrom(sock_fd, recvBuf, sizeof(recvBuf), 0, (struct sockaddr*)&client_addr,(socklen_t*)&size_client_addr);
    if(ret < 0)
    {
        printf("UDP server receive failed!\r\n");
        return -1;
    }
    printf("receive %d bytes of data from ipaddr = %s, port = %d.\r\n", ret, inet_ntoa(client_addr.sin_addr), ntohs(client_addr.sin_port));
    printf("data is %s\r\n",recvBuf);
    ret = sendto(sock_fd, recvBuf, strlen(recvBuf), 0, (struct sockaddr *)&client_addr, sizeof(client_addr));
    if (ret < 0)
    {
        printf("UDP server send failed!\r\n");
        return -1;
    }
}
/*********************END********************/
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}

static void HotspotStaJoinTask(void)
{
static char macAddress[32] = {0};
StationInfo stainfo[WIFI_MAX_STA_NUM] = {0};
StationInfo *sta_list_node = NULL;
unsigned int size = WIFI_MAX_STA_NUM;

error = GetStationList(stainfo, &size);
if (error != WIFI_SUCCESS) {
    printf("HotspotStaJoin:get list fail, error is %d.\r\n", error);
    return;
}
sta_list_node = stainfo;
for (uint32_t i = 0; i < size; i++, sta_list_node++) {
unsigned char* mac = sta_list_node->macAddress;
snprintf(macAddress, sizeof(macAddress), "%02X:%02X:%02X:%02X:%02X:%02X", mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
printf("HotspotSta[%d]: macAddress=%s.\r\n",i, macAddress);
}
g_apEnableSuccess++;
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static void Wifi_AP_Demo(void)
{
osThreadAttr_t attr;

attr.name = "WifiAPTask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 10240;
attr.priority = 25;

if (osThreadNew((osThreadFunc_t)WifiAPTask, NULL, &attr) == NULL)
{
    printf("Falied to create WifiAPTask!\r\n");
}
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}

APP_FEATURE_INIT(Wifi_AP_Demo);

WIFI STA联网

API

wifi_device.h中包括声明STA联网相关接口函数
梅科尔工作室-鸿蒙十四天实战培训笔记（day5）--无线联网开发-鸿蒙开发者社区

例程

#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include “lwip/netif.h”
#include “lwip/netifapi.h”
#include “lwip/ip4_addr.h”
#include “lwip/api_shell.h”

#include “cmsis_os2.h”
#include “hos_types.h”
#include “wifi_device.h”
#include “wifiiot_errno.h”
#include “ohos_init.h”

#define DEF_TIMEOUT 15
#define ONE_SECOND 1

static void WiFiInit(void);
static void WaitSacnResult(void);
static int WaitConnectResult(void);
static void OnWifiScanStateChangedHandler(int state, int size);
static void OnWifiConnectionChangedHandler(int state, WifiLinkedInfo *info);
static void OnHotspotStaJoinHandler(StationInfo *info);
static void OnHotspotStateChangedHandler(int state);
static void OnHotspotStaLeaveHandler(StationInfo *info);

static int g_staScanSuccess = 0;
static int g_ConnectSuccess = 0;
static int ssid_count = 0;
WifiEvent g_wifiEventHandler = {0};
WifiErrorCode error;

#define SELECT_WLAN_PORT “wlan0”

#define SELECT_WIFI_SSID “BearPi”
#define SELECT_WIFI_PASSWORD “0987654321”
#define SELECT_WIFI_SECURITYTYPE WIFI_SEC_TYPE_PSK

static BOOL WifiSTATask(void)
{
WifiScanInfo *info = NULL;
unsigned int size = WIFI_SCAN_HOTSPOT_LIMIT;
static struct netif *g_lwip_netif = NULL;
WifiDeviceConfig select_ap_config = {0};

osDelay(200);
printf("<--System Init-->\r\n");

//初始化WIFI
WiFiInit();

//使能WIFI
if (EnableWifi() != WIFI_SUCCESS)
{
    printf("EnableWifi failed, error = %d\n", error);
    return -1;
}

//判断WIFI是否激活
if (IsWifiActive() == 0)
{
    printf("Wifi station is not actived.\n");
    return -1;
}

//分配空间，保存WiFi信息
info = malloc(sizeof(WifiScanInfo) * WIFI_SCAN_HOTSPOT_LIMIT);
if (info == NULL)
{
    return -1;
}

//轮询查找WiFi列表
do{
    //重置标志位
    ssid_count = 0;
    g_staScanSuccess = 0;

    //开始扫描
    Scan();

    //等待扫描结果
    WaitSacnResult();

    //获取扫描列表
    error = GetScanInfoList(info, &size);

}while(g_staScanSuccess != 1);

//打印WiFi列表
printf("********************\r\n");
for(uint8_t i = 0; i < ssid_count; i++)
{
    printf("no:%03d, ssid:%-30s, rssi:%5d\r\n", i+1, info[i].ssid, info[i].rssi/100);
}
printf("********************\r\n");


//连接指定的WiFi热点
for(uint8_t i = 0; i < ssid_count; i++)
{
    if (strcmp(SELECT_WIFI_SSID, info[i].ssid) == 0)
    {
        int result;

        printf("Select:%3d wireless, Waiting...\r\n", i+1);

        //拷贝要连接的热点信息
        strcpy(select_ap_config.ssid, info[i].ssid);
        strcpy(select_ap_config.preSharedKey, SELECT_WIFI_PASSWORD);
        select_ap_config.securityType = SELECT_WIFI_SECURITYTYPE;

        if (AddDeviceConfig(&select_ap_config, &result) == WIFI_SUCCESS)
        {
            if (ConnectTo(result) == WIFI_SUCCESS && WaitConnectResult() == 1)
            {
                printf("WiFi connect succeed!\r\n");
                g_lwip_netif = netifapi_netif_find(SELECT_WLAN_PORT);
                break;
            }
        }
    }

    if(i == ssid_count-1)
    {
        printf("ERROR: No wifi as expected\r\n");
        while(1) osDelay(100);
    }
}

//启动DHCP
if (g_lwip_netif)
{
    dhcp_start(g_lwip_netif);
    printf("begain to dhcp");
}


//等待DHCP
for(;;)
{
    if(dhcp_is_bound(g_lwip_netif) == ERR_OK)
    {
        printf("<-- DHCP state:OK -->\r\n");

        //打印获取到的IP信息
        netifapi_netif_common(g_lwip_netif, dhcp_clients_info_show, NULL);
        break;
    }

    printf("<-- DHCP state:Inprogress -->\r\n");
    osDelay(100);
}

//执行其他操作
for(;;)
{
    osDelay(100);
}
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}

static void WiFiInit(void)
{
printf(“<–Wifi Init–>\r\n”);
g_wifiEventHandler.OnWifiScanStateChanged = OnWifiScanStateChangedHandler;
g_wifiEventHandler.OnWifiConnectionChanged = OnWifiConnectionChangedHandler;
g_wifiEventHandler.OnHotspotStaJoin = OnHotspotStaJoinHandler;
g_wifiEventHandler.OnHotspotStaLeave = OnHotspotStaLeaveHandler;
g_wifiEventHandler.OnHotspotStateChanged = OnHotspotStateChangedHandler;
error = RegisterWifiEvent(&g_wifiEventHandler);
if (error != WIFI_SUCCESS)
{
printf(“register wifi event fail!\r\n”);
}
else
{
printf(“register wifi event succeed!\r\n”);
}
}

static void OnWifiScanStateChangedHandler(int state, int size)
{
(void)state;
if (size > 0)
{
ssid_count = size;
g_staScanSuccess = 1;
}
return;
}

static void OnWifiConnectionChangedHandler(int state, WifiLinkedInfo *info)
{
(void)info;

if (state > 0)
{
    g_ConnectSuccess = 1;
    printf("callback function for wifi connect\r\n");
}
else
{
    printf("connect error,please check password\r\n");
}
return;
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}

static void OnHotspotStaJoinHandler(StationInfo *info)
{
(void)info;
printf(“STA join AP\n”);
return;
}

static void OnHotspotStaLeaveHandler(StationInfo *info)
{
(void)info;
printf(“HotspotStaLeave:info is null.\n”);
return;
}

static void OnHotspotStateChangedHandler(int state)
{
printf(“HotspotStateChanged:state is %d.\n”, state);
return;
}

static void WaitSacnResult(void)
{
int scanTimeout = DEF_TIMEOUT;
while (scanTimeout > 0)
{
sleep(ONE_SECOND);
scanTimeout–;
if (g_staScanSuccess == 1)
{
printf(“WaitSacnResult:wait success[%d]s\n”, (DEF_TIMEOUT - scanTimeout));
break;
}
}
if (scanTimeout <= 0)
{
printf(“WaitSacnResult:timeout!\n”);
}
}

static int WaitConnectResult(void)
{
int ConnectTimeout = DEF_TIMEOUT;
while (ConnectTimeout > 0)
{
sleep(1);
ConnectTimeout–;
if (g_ConnectSuccess == 1)
{
printf(“WaitConnectResult:wait success[%d]s\n”, (DEF_TIMEOUT - ConnectTimeout));
break;
}
}
if (ConnectTimeout <= 0)
{
printf(“WaitConnectResult:timeout!\n”);
return 0;
}

return 1;
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}

static void WifiClientSTA(void)
{
osThreadAttr_t attr;

attr.name = "WifiSTATask";
attr.attr_bits = 0U;
attr.cb_mem = NULL;
attr.cb_size = 0U;
attr.stack_mem = NULL;
attr.stack_size = 10240;
attr.priority = 24;

if (osThreadNew((osThreadFunc_t)WifiSTATask, NULL, &attr) == NULL)
{
    printf("Falied to create WifiSTATask!\n");
}
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}

APP_FEATURE_INIT(WifiClientSTA);

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