Add ESP8266 example

examples/esp32/main/wifi.c

@@ -1,13 +1,13 @@
 // Code taken from the ESP32 IDF WiFi station Example
 
 #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_event.h"
 #include "esp_log.h"
+#include "esp_system.h"
+#include "esp_wifi.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/event_groups.h"
+#include "freertos/task.h"
 #include "nvs_flash.h"
 
 #include "lwip/err.h"
@@ -17,11 +17,12 @@
 
 static EventGroupHandle_t s_wifi_event_group;
 
-/* The event group allows multiple bits for each event, but we only care about two events:
+/* The event group allows multiple bits for each event, but we only care about
+ * two events:
  * - we are connected to the AP with an IP
  * - we failed to connect after the maximum amount of retries */
 #define WIFI_CONNECTED_BIT BIT0
-#define WIFI_FAIL_BIT      BIT1
+#define WIFI_FAIL_BIT BIT1
 
 static int s_retry_num = 0;
 
@@ -47,7 +48,7 @@ static void event_handler(void *arg, esp_event_base_t event_base,
   }
 }
 
-void wifi_init(const char *ssid, const char *pass, void (*fn)(void)) {
+void wifi_init(const char *ssid, const char *pass) {
   esp_err_t ret = nvs_flash_init();
   if (ret == ESP_ERR_NVS_NO_FREE_PAGES ||
       ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {