156 lines
5 KiB
C
156 lines
5 KiB
C
/* Scan Example
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This example code is in the Public Domain (or CC0 licensed, at your option.)
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Unless required by applicable law or agreed to in writing, this
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software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
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CONDITIONS OF ANY KIND, either express or implied.
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*/
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/*
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This example shows how to use the All Channel Scan or Fast Scan to connect
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to a Wi-Fi network.
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In the Fast Scan mode, the scan will stop as soon as the first network matching
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the SSID is found. In this mode, an application can set threshold for the
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authentication mode and the Signal strength. Networks that do not meet the
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threshold requirements will be ignored.
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In the All Channel Scan mode, the scan will end only after all the channels
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are scanned, and connection will start with the best network. The networks
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can be sorted based on Authentication Mode or Signal Strength. The priority
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for the Authentication mode is: WPA2 > WPA > WEP > Open
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*/
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#include <string.h>
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#include "freertos/FreeRTOS.h"
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#include "freertos/event_groups.h"
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#include "esp_wifi.h"
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#include "esp_log.h"
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#include "esp_event.h"
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#include "nvs_flash.h"
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#define DEFAULT_SCAN_LIST_SIZE CONFIG_EXAMPLE_SCAN_LIST_SIZE
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static const char *TAG = "scan";
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static void print_auth_mode(int authmode)
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{
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switch (authmode) {
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case WIFI_AUTH_OPEN:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_OPEN");
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break;
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case WIFI_AUTH_WEP:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WEP");
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break;
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case WIFI_AUTH_WPA_PSK:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA_PSK");
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break;
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case WIFI_AUTH_WPA2_PSK:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA2_PSK");
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break;
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case WIFI_AUTH_WPA_WPA2_PSK:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA_WPA2_PSK");
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break;
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case WIFI_AUTH_WPA2_ENTERPRISE:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_WPA2_ENTERPRISE");
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break;
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default:
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ESP_LOGI(TAG, "Authmode \tWIFI_AUTH_UNKNOWN");
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break;
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}
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}
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static void print_cipher_type(int pairwise_cipher, int group_cipher)
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{
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switch (pairwise_cipher) {
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case WIFI_CIPHER_TYPE_NONE:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_NONE");
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break;
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case WIFI_CIPHER_TYPE_WEP40:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_WEP40");
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break;
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case WIFI_CIPHER_TYPE_WEP104:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_WEP104");
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break;
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case WIFI_CIPHER_TYPE_TKIP:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_TKIP");
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break;
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case WIFI_CIPHER_TYPE_CCMP:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_CCMP");
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break;
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case WIFI_CIPHER_TYPE_TKIP_CCMP:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_TKIP_CCMP");
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break;
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default:
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ESP_LOGI(TAG, "Pairwise Cipher \tWIFI_CIPHER_TYPE_UNKNOWN");
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break;
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}
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switch (group_cipher) {
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case WIFI_CIPHER_TYPE_NONE:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_NONE");
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break;
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case WIFI_CIPHER_TYPE_WEP40:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_WEP40");
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break;
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case WIFI_CIPHER_TYPE_WEP104:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_WEP104");
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break;
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case WIFI_CIPHER_TYPE_TKIP:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_TKIP");
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break;
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case WIFI_CIPHER_TYPE_CCMP:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_CCMP");
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break;
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case WIFI_CIPHER_TYPE_TKIP_CCMP:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_TKIP_CCMP");
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break;
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default:
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ESP_LOGI(TAG, "Group Cipher \tWIFI_CIPHER_TYPE_UNKNOWN");
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break;
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}
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}
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/* Initialize Wi-Fi as sta and set scan method */
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static void wifi_scan(void)
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{
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tcpip_adapter_init();
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ESP_ERROR_CHECK(esp_event_loop_create_default());
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wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
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ESP_ERROR_CHECK(esp_wifi_init(&cfg));
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uint16_t number = DEFAULT_SCAN_LIST_SIZE;
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wifi_ap_record_t ap_info[DEFAULT_SCAN_LIST_SIZE];
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memset(ap_info, 0, sizeof(ap_info));
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_start());
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ESP_ERROR_CHECK(esp_wifi_scan_start(NULL, true));
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ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&number, ap_info));
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for (int i = 0; i < DEFAULT_SCAN_LIST_SIZE; i++) {
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ESP_LOGI(TAG, "SSID \t\t%s", ap_info[i].ssid);
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ESP_LOGI(TAG, "RSSI \t\t%d", ap_info[i].rssi);
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print_auth_mode(ap_info[i].authmode);
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if (ap_info[i].authmode != WIFI_AUTH_WEP) {
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print_cipher_type(ap_info[i].pairwise_cipher, ap_info[i].group_cipher);
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}
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ESP_LOGI(TAG, "Channel \t\t%d\n", ap_info[i].primary);
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}
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}
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void app_main(void)
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{
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// Initialize NVS
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esp_err_t ret = nvs_flash_init();
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if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
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ESP_ERROR_CHECK(nvs_flash_erase());
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ret = nvs_flash_init();
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}
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ESP_ERROR_CHECK( ret );
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wifi_scan();
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}
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