mch2022-talktopics/main/wifi_connection.c
2022-05-24 14:35:05 +02:00

146 lines
5.6 KiB
C

#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 "lwip/err.h"
#include "lwip/sys.h"
#include "wifi_connection.h"
static const char *TAG = "wifi_connection";
#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT BIT1
static EventGroupHandle_t s_wifi_event_group;
static uint8_t gRetryCounter = 0;
static uint8_t gRetryMax = 3;
static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
esp_wifi_connect();
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
if (gRetryCounter < 3) {
esp_wifi_connect();
gRetryCounter++;
ESP_LOGI(TAG, "retry to connect to the AP");
} else {
ESP_LOGI(TAG,"connect to the AP fail");
xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
}
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
ESP_LOGI(TAG, "got ip:" IPSTR, IP2STR(&event->ip_info.ip));
gRetryCounter = 0;
xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
}
}
void wifi_init() {
s_wifi_event_group = xEventGroupCreate();
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
esp_event_handler_instance_t instance_any_id;
esp_event_handler_instance_t instance_got_ip;
ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
ESP_ERROR_CHECK(esp_wifi_stop());
}
bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAuthmode, uint8_t aRetryMax) {
gRetryCounter = 0;
gRetryMax = aRetryMax;
wifi_config_t wifi_config = {0};
strcpy((char*) wifi_config.sta.ssid, aSsid);
strcpy((char*) wifi_config.sta.password, aPassword);
wifi_config.sta.threshold.authmode = aAuthmode;
// Set WiFi config.
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
// Disable 11b as NOC asked.
esp_wifi_config_11b_rate(WIFI_IF_STA, true);
// Start WiFi.
ESP_ERROR_CHECK(esp_wifi_start());
ESP_LOGI(TAG, "Connecting to WiFi...");
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "Connected to WiFi");
return true;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGE(TAG, "Failed to connect");
ESP_ERROR_CHECK(esp_wifi_stop());
} else {
ESP_LOGE(TAG, "Unknown event received while waiting on connection");
ESP_ERROR_CHECK(esp_wifi_stop());
}
return false;
}
bool wifi_connect_ent(const char* aSsid, const char *aIdent, const char *aAnonIdent, const char* aPassword, uint8_t aRetryMax) {
gRetryCounter = 0;
gRetryMax = aRetryMax;
wifi_config_t wifi_config = {0};
if (strlen(aSsid) > 32) {
ESP_LOGE(TAG, "SSID is too long (%zu > 32)!", strlen(aSsid));
return false;
}
strncpy((char*) wifi_config.sta.ssid, aSsid, 32);
// Set WiFi config.
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
// Set WPA2 ENT config.
esp_wifi_sta_wpa2_ent_set_identity((const uint8_t *) aAnonIdent, strlen(aAnonIdent));
esp_wifi_sta_wpa2_ent_set_username((const uint8_t *) aIdent, strlen(aIdent));
esp_wifi_sta_wpa2_ent_set_password((const uint8_t *) aPassword, strlen(aPassword));
esp_wifi_sta_wpa2_ent_set_ttls_phase2_method(ESP_EAP_TTLS_PHASE2_MSCHAPV2);
// Enable enterprise auth.
esp_wifi_sta_wpa2_ent_enable();
// Disable 11b as NOC asked.
esp_wifi_config_11b_rate(WIFI_IF_STA, true);
// Start the connection.
esp_wifi_start();
ESP_LOGI(TAG, "Connecting to WiFi...");
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(s_wifi_event_group, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "Connected to WiFi");
return true;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGE(TAG, "Failed to connect");
ESP_ERROR_CHECK(esp_wifi_stop());
} else {
ESP_LOGE(TAG, "Unknown event received while waiting on connection");
ESP_ERROR_CHECK(esp_wifi_stop());
}
return false;
}
void wifi_scan() {
}