affde01b4c
Rephrased the example's description to make it easier to understand and made other grammatical fixes. Signed-off-by: Piyush Shah <piyush@espressif.com>
128 lines
4 KiB
C
128 lines
4 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 "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_loop.h"
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#include "nvs_flash.h"
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/*Set the SSID and Password via "make menuconfig"*/
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#define DEFAULT_SSID CONFIG_WIFI_SSID
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#define DEFAULT_PWD CONFIG_WIFI_PASSWORD
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#if CONFIG_WIFI_ALL_CHANNEL_SCAN
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#define DEFAULT_SCAN_METHOD WIFI_ALL_CHANNEL_SCAN
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#elif CONFIG_WIFI_FAST_SCAN
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#define DEFAULT_SCAN_METHOD WIFI_FAST_SCAN
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#else
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#define DEFAULT_SCAN_METHOD WIFI_FAST_SCAN
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#endif /*CONFIG_SCAN_METHOD*/
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#if CONFIG_WIFI_CONNECT_AP_BY_SIGNAL
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SIGNAL
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#elif CONFIG_WIFI_CONNECT_AP_BY_SECURITY
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SECURITY
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#else
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#define DEFAULT_SORT_METHOD WIFI_CONNECT_AP_BY_SIGNAL
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#endif /*CONFIG_SORT_METHOD*/
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#if CONFIG_FAST_SCAN_THRESHOLD
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#define DEFAULT_RSSI CONFIG_FAST_SCAN_MINIMUM_SIGNAL
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#if CONFIG_EXAMPLE_OPEN
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#elif CONFIG_EXAMPLE_WEP
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#define DEFAULT_AUTHMODE WIFI_AUTH_WEP
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#elif CONFIG_EXAMPLE_WPA
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#define DEFAULT_AUTHMODE WIFI_AUTH_WPA_PSK
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#elif CONFIG_EXAMPLE_WPA2
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#define DEFAULT_AUTHMODE WIFI_AUTH_WPA2_PSK
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#else
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#endif
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#else
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#define DEFAULT_RSSI -127
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#define DEFAULT_AUTHMODE WIFI_AUTH_OPEN
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#endif /*CONFIG_FAST_SCAN_THRESHOLD*/
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static const char *TAG = "scan";
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static esp_err_t event_handler(void *ctx, system_event_t *event)
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{
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switch (event->event_id) {
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case SYSTEM_EVENT_STA_START:
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ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
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ESP_ERROR_CHECK(esp_wifi_connect());
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break;
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case SYSTEM_EVENT_STA_GOT_IP:
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ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
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ESP_LOGI(TAG, "Got IP: %s\n",
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ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
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break;
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case SYSTEM_EVENT_STA_DISCONNECTED:
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ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
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ESP_ERROR_CHECK(esp_wifi_connect());
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break;
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default:
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break;
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}
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return ESP_OK;
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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_init(event_handler, NULL));
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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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wifi_config_t wifi_config = {
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.sta = {
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.ssid = DEFAULT_SSID,
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.password = DEFAULT_PWD,
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.scan_method = DEFAULT_SCAN_METHOD,
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.sort_method = DEFAULT_SORT_METHOD,
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.threshold.rssi = DEFAULT_RSSI,
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.threshold.authmode = DEFAULT_AUTHMODE,
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},
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};
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ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
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ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
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ESP_ERROR_CHECK(esp_wifi_start());
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}
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void app_main()
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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) {
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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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