100字范文 > 54 ESP32Wifi模块之开启AP+STA共存及IP_NAPT模式

54 ESP32Wifi模块之开启AP+STA共存及IP_NAPT模式

时间：2018-12-01 10:54:02

54.1 引言

探索完4G模块的应用、蓝牙模块的应用，最近开始了WiFi模块的使用。WiFi模块我们选择了广泛应用的esp32WiFi模组，所以就重新踏入了WiFi探索之旅。

然后项目上要用到WiFi的AP+STA模式，并且要开启NAT模式，就是WiFi模块能连接路由器，然后手机能连接WiFi模块，然后手机通过WiFi模块连接到路由器，能通过WiFi模块上网。

54.2AP+STA+IP_NAPT代码

话不多说，先上app_main.c代码。这个代码也是网上搜集到的，自己理解后翻炒了一遍吧。。

#include <string.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 0x08080808 // 8.8.8.8//模块AP自己的SSID和PWD#define HT_ESP32_AP_SSID CONFIG_ESP_AP_SSID#define HT_ESP32_AP_PASS CONFIG_ESP_AP_PASSWORD//连接路由的SSID和PWD#define HT_ESP32_STA_SSID"hello"#define HT_ESP32_STA_PASS"world"#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();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 serverdhcps_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 serverdnsserver.u_addr.ip4.addr = htonl(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);}static void htHrint_task(void *pvParameters){while(1){ESP_LOGI(TAG, "hello world\r\n");vTaskDelay(1000 / portTICK_PERIOD_MS);/* 延时1000ms*/}}void app_main(){// Initialize NVSesp_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 WIFIwifi_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_NAPTu32_t napt_netif_ip = 0xC0A80401; // Set to ip address of softAP netif (Default is 192.168.4.1)ip_napt_enable(htonl(napt_netif_ip), 1);ESP_LOGI(TAG, "------------------------>NAT is enabled");#endifxTaskCreate(htHrint_task, "HTTask", 4096, NULL, 5, NULL);}