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esp32实现wifi无线中继

esp32实现wifi无线中继

作者: VellBibi | 来源:发表于2022-06-15 16:43 被阅读0次

    menuconfig打开CONFIG_LWIP_IPV4_NAPT

    中继的代码如下：

    #include <string.h>
#include <esp_ping.h>
#include <ping/ping_sock.h>
#include <lwip/netdb.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_wpa2.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "driver/gpio.h"
#include "lwip/opt.h"

#if IP_NAPT

#include "lwip/lwip_napt.h"

#endif

#include "lwip/err.h"
#include "lwip/sys.h"

#define MY_DNS_IP_ADDR                "8.8.8.8"
#define MY_AP_IP_ADDR                "10.0.1.1"

//模块AP自己的SSID和PWD
#define HT_ESP32_AP_SSID            "esp-ap"
#define HT_ESP32_AP_PASS            "88888888"
//连接路由的SSID和PWD
#define HT_ESP32_STA_SSID            "source-ap"
#define HT_ESP32_STA_PASS            "88888888"

#define HT_ESP32_MAXIMUM_RETRY        (10)

/* FreeRTOS event group to signal when we are connected*/
static EventGroupHandle_t s_wifi_event_group;

/* The event group allows multiple bits for each event, but we only care about one event
 * - are we connected to the AP with an IP? */
const int WIFI_CONNECTED_BIT = BIT0;

static const char *TAG = "wifi apsta";

static int s_retry_num = 0;

static esp_err_t event_handler(void *ctx, system_event_t *event) {
    switch (event->event_id) {
        case SYSTEM_EVENT_STA_START:
            esp_wifi_connect();
            break;
        case SYSTEM_EVENT_STA_GOT_IP:
            ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->event_info.got_ip.ip_info.ip));
            s_retry_num = 0;
            xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
            break;
        case SYSTEM_EVENT_STA_DISCONNECTED: {


            if (s_retry_num < HT_ESP32_MAXIMUM_RETRY) {
                esp_wifi_connect();
                xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
                s_retry_num++;
                ESP_LOGI(TAG, "retry to connect to the AP");
            }
            ESP_LOGI(TAG, "connect to the AP failed:%d", event->event_info.disconnected.reason);
            break;
        }
        case SYSTEM_EVENT_AP_STACONNECTED:
            ESP_LOGI(TAG, "station connected");
            break;
        case SYSTEM_EVENT_AP_STADISCONNECTED:
            ESP_LOGI(TAG, "station disconnected");
            break;
        default:
            break;
    }
    return ESP_OK;
}

void wifi_init_sta() {
    ip_addr_t dnsserver;
    //tcpip_adapter_dns_info_t dnsinfo;

    s_wifi_event_group = xEventGroupCreate();

    tcpip_adapter_init();
    // 配置AP的ip地址
    tcpip_adapter_ip_info_t ip_info = {
            .ip.addr = ipaddr_addr(MY_AP_IP_ADDR),
            .netmask.addr = ipaddr_addr("255.255.255.0"),
            .gw.addr      = ipaddr_addr(MY_AP_IP_ADDR),
    };
    ESP_ERROR_CHECK(tcpip_adapter_dhcps_stop(TCPIP_ADAPTER_IF_AP));
    ESP_ERROR_CHECK(tcpip_adapter_set_ip_info(TCPIP_ADAPTER_IF_AP, &ip_info));
    ESP_ERROR_CHECK(tcpip_adapter_dhcps_start(TCPIP_ADAPTER_IF_AP));

    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));

    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_APSTA));


    /* ESP STATION CONFIG */
    wifi_config_t sta_config = {
            .sta = {
                    .ssid        = HT_ESP32_STA_SSID,
                    .password    = HT_ESP32_STA_PASS,
                    /* 设置密码意味着工作站将连接到所有安全模式，包括WEP/WPA.
                     * However these modes are deprecated and not advisable to be used. Incase your Access point
                     * doesn't support WPA2, these mode can be enabled by commenting below line */
                    .threshold.authmode = WIFI_AUTH_WPA2_PSK,
                    .bssid_set = false,

                    .pmf_cfg = {
                            .capable = true,
                            .required = false
                    },
            },
    };

    /* ESP AP CONFIG */
    wifi_config_t ap_config = {
            .ap = {
                    .ssid            = HT_ESP32_AP_SSID,
                    .channel        = 0,
                    .authmode        = WIFI_AUTH_WPA2_PSK,
                    .password        = HT_ESP32_AP_PASS,
                    .ssid_hidden    = 0,
                    .max_connection    = 4,
                    .beacon_interval = 100
            }
    };

    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &sta_config));
    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_AP, &ap_config));

    // Enable DNS (offer) for dhcp server
    dhcps_offer_t dhcps_dns_value = OFFER_DNS;
    dhcps_set_option_info(6, &dhcps_dns_value, sizeof(dhcps_dns_value));

    // Set custom dns server address for dhcp server
    dnsserver.u_addr.ip4.addr = ipaddr_addr(MY_DNS_IP_ADDR);
    dnsserver.type = IPADDR_TYPE_V4;
    dhcps_dns_setserver(&dnsserver);

    //tcpip_adapter_get_dns_info(TCPIP_ADAPTER_IF_AP, TCPIP_ADAPTER_DNS_MAIN, &dnsinfo);
    // ESP_LOGI(TAG, "DNS IP:" IPSTR, IP2STR(&dnsinfo.ip.u_addr.ip4));

    ESP_ERROR_CHECK(esp_wifi_start());

    ESP_LOGI(TAG, "wifi_init_apsta finished.");
    ESP_LOGI(TAG, "connect to ap SSID: %s ", sta_config.sta.ssid);
}

void app_main() {
    // Initialize NVS
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);

    // Setup WIFI
    wifi_init_sta();
//这里就是打开nat转换的代码，但是除了代码这里要有，还需要配置
#if IP_NAPT
    ip_napt_enable(ipaddr_addr(MY_AP_IP_ADDR), 1);
    ESP_LOGI(TAG, "------------------------>NAT is enabled");
#endif
}

    补一份cpp代码

    #include <string.h>
#include <esp_ping.h>
#include <ping/ping_sock.h>
#include <lwip/netdb.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_wifi.h"
#include "esp_wpa2.h"
#include "esp_event.h"
#include "esp_log.h"
#include "nvs_flash.h"
#include "driver/gpio.h"
#include "lwip/opt.h"

#if IP_NAPT

#include "lwip/lwip_napt.h"

#endif

#include "lwip/err.h"
#include "lwip/sys.h"

#define MY_DNS_IP_ADDR                "8.8.8.8"
#define MY_AP_IP_ADDR                "10.0.1.1"
#define MY_AP_CHANNEL                3

//模块AP自己的SSID和PWD
#define HT_ESP32_AP_SSID            "esp-ap"
#define HT_ESP32_AP_PASS            "88888888"
//连接路由的SSID和PWD
#define HT_ESP32_STA_SSID            "Wireless 2.4G"
#define HT_ESP32_STA_PASS            "66666666"

#define HT_ESP32_MAXIMUM_RETRY        (10)

/* FreeRTOS event group to signal when we are connected*/
static EventGroupHandle_t s_wifi_event_group;

/* The event group allows multiple bits for each event, but we only care about one event
 * - are we connected to the AP with an IP? */
const int WIFI_CONNECTED_BIT = BIT0;

static const char *TAG = "wifi apsta";

static int s_retry_num = 0;

static esp_err_t event_handler(void *ctx, system_event_t *event) {
    switch (event->event_id) {
        case SYSTEM_EVENT_STA_START:
            esp_wifi_connect();
            break;
        case SYSTEM_EVENT_STA_GOT_IP:
            ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->event_info.got_ip.ip_info.ip));
            s_retry_num = 0;
            xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
            break;
        case SYSTEM_EVENT_STA_DISCONNECTED: {


            if (s_retry_num < HT_ESP32_MAXIMUM_RETRY) {
                esp_wifi_connect();
                xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
                s_retry_num++;
                ESP_LOGI(TAG, "retry to connect to the AP");
            }
            ESP_LOGI(TAG, "connect to the AP failed:%d", event->event_info.disconnected.reason);
            break;
        }
        case SYSTEM_EVENT_AP_STACONNECTED:
            ESP_LOGI(TAG, "station connected");
            break;
        case SYSTEM_EVENT_AP_STADISCONNECTED:
            ESP_LOGI(TAG, "station disconnected");
            break;
        default:
            break;
    }
    return ESP_OK;
}

void wifi_init_sta() {
    //tcpip_adapter_dns_info_t dnsinfo;

    s_wifi_event_group = xEventGroupCreate();

    tcpip_adapter_init();
    // 配置AP的ip地址
    tcpip_adapter_ip_info_t ip_info;
    ip_info.ip.addr = ipaddr_addr(MY_AP_IP_ADDR);
    ip_info.netmask.addr = ipaddr_addr("255.255.255.0");
    ip_info.gw.addr = ipaddr_addr(MY_AP_IP_ADDR);
    ESP_ERROR_CHECK(tcpip_adapter_dhcps_stop(TCPIP_ADAPTER_IF_AP));
    ESP_ERROR_CHECK(tcpip_adapter_set_ip_info(TCPIP_ADAPTER_IF_AP, &ip_info));
    ESP_ERROR_CHECK(tcpip_adapter_dhcps_start(TCPIP_ADAPTER_IF_AP));

    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));

    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_APSTA));


    /* ESP STATION CONFIG */
    wifi_config_t sta_config;
    strcpy((char *) sta_config.sta.ssid, HT_ESP32_STA_SSID);
    strcpy((char *) sta_config.sta.password, HT_ESP32_STA_PASS);
//    memcpy(sta_config.sta.ssid, HT_ESP32_STA_SSID, strlen(HT_ESP32_STA_SSID));
//    memcpy(sta_config.sta.password, HT_ESP32_STA_PASS, strlen(HT_ESP32_STA_PASS));
    /* 设置密码意味着工作站将连接到所有安全模式，包括WEP/WPA.
     * However these modes are deprecated and not advisable to be used. Incase your Access point
     * doesn't support WPA2, these mode can be enabled by commenting below line */
    sta_config.sta.threshold.authmode = WIFI_AUTH_WPA2_PSK;
    sta_config.sta.bssid_set = false;
    sta_config.sta.pmf_cfg.capable = true;
    sta_config.sta.pmf_cfg.required = false;

    /* ESP AP CONFIG */
    wifi_config_t ap_config;
    strcpy((char *) ap_config.ap.ssid, HT_ESP32_AP_SSID);
    strcpy((char *) ap_config.ap.password, HT_ESP32_AP_PASS);
//    memcpy(ap_config.ap.ssid, HT_ESP32_AP_SSID, strlen(HT_ESP32_AP_SSID));
//    memcpy(ap_config.ap.password, HT_ESP32_AP_PASS, strlen(HT_ESP32_AP_PASS));

    ap_config.ap.ssid_len = strlen(HT_ESP32_AP_SSID);
    ap_config.ap.channel = MY_AP_CHANNEL;
    ap_config.ap.authmode = WIFI_AUTH_WPA2_PSK;
    ap_config.ap.ssid_hidden = 0;
    ap_config.ap.max_connection = 4;
    ap_config.ap.beacon_interval = 100;

    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &sta_config));
    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_AP, &ap_config));

    // Enable DNS (offer) for dhcp server
    dhcps_offer_t dhcps_dns_value = OFFER_DNS;
    dhcps_set_option_info(6, &dhcps_dns_value, sizeof(dhcps_dns_value));

    // Set custom dns server address for dhcp server
    ip_addr_t dnsserver;
    dnsserver.addr = ipaddr_addr(MY_DNS_IP_ADDR);
    dhcps_dns_setserver(&dnsserver);

    //tcpip_adapter_get_dns_info(TCPIP_ADAPTER_IF_AP, TCPIP_ADAPTER_DNS_MAIN, &dnsinfo);
    // ESP_LOGI(TAG, "DNS IP:" IPSTR, IP2STR(&dnsinfo.ip.u_addr.ip4));

    ESP_ERROR_CHECK(esp_wifi_start());

    ESP_LOGI(TAG, "wifi_init_apsta finished.");
    ESP_LOGI(TAG, "connect to ap SSID: %s ", sta_config.sta.ssid);
}

extern "C" void app_main() {
    // Initialize NVS
    esp_err_t ret = nvs_flash_init();
    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
        ESP_ERROR_CHECK(nvs_flash_erase());
        ret = nvs_flash_init();
    }
    ESP_ERROR_CHECK(ret);

    // Setup WIFI
    wifi_init_sta();
//这里就是打开nat转换的代码，但是除了代码这里要有，还需要配置
#if IP_NAPT
    ip_napt_enable(ipaddr_addr(MY_AP_IP_ADDR), 1);
    ESP_LOGI(TAG, "------------------------>NAT is enabled");
#endif
}

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