Added some wifi code, not tested yet, but must be merged with master first for updates from there

code/main/CMakeLists.txt

@@ -2,8 +2,12 @@
 # for more information about component CMakeLists.txt files.
 
 idf_component_register(
-    SRCS main.c         # list the source files of this component
+    SRCS                # list the source files of this component
+    "main.cpp" 
+    "gpio.cpp"
+    "wifi.cpp"
     INCLUDE_DIRS        # optional, add here public include directories
+    "inc"
     PRIV_INCLUDE_DIRS   # optional, add here private include directories
     REQUIRES            # optional, list the public requirements (component names)
     PRIV_REQUIRES       # optional, list the private requirements

code/main/inc/wifi.h

@@ -34,7 +34,13 @@
 
 // CompilerIncludes
 //  All include files that are provided by the compiler directly
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_log.h"
 
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/event_groups.h"
 
 
 // ProjectIncludes
@@ -56,7 +62,19 @@
 // Function declarations 
 // --------------------------------------------------------------------------------------------------------------------
 
+class Wifi
+{
+   public:
 
+      Wifi(void);
+
+      void start_client(void);
+
+      void event_handler(void* arg, esp_event_base_t event_base,  int32_t event_id, void* event_data);
+
+   private:
+      EventGroupHandle_t s_wifi_event_group;
+};
 
 
 /** @} */

code/main/src/wifi.cpp

@@ -48,7 +48,90 @@
 
 
 
+void Wifi::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 (s_retry_num < EXAMPLE_ESP_MAXIMUM_RETRY) {
+            esp_wifi_connect();
+            s_retry_num++;
+            ESP_LOGI(TAG, "retry to connect to the AP");
+        } else {
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+        }
+        ESP_LOGI(TAG,"connect to the AP fail");
+    } 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));
+        s_retry_num = 0;
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    }
+}
 
+void Wifi::start_client(void)
+{
+    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));
+
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = EXAMPLE_ESP_WIFI_SSID,
+            .password = EXAMPLE_ESP_WIFI_PASS,
+            /* Authmode threshold resets to WPA2 as default if password matches WPA2 standards (pasword len => 8).
+             * If you want to connect the device to deprecated WEP/WPA networks, Please set the threshold value
+             * to WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK and set the password with length and format matching to
+        * WIFI_AUTH_WEP/WIFI_AUTH_WPA_PSK standards.
+             */
+            .threshold.authmode = ESP_WIFI_SCAN_AUTH_MODE_THRESHOLD,
+            .sae_pwe_h2e = WPA3_SAE_PWE_BOTH,
+        },
+    };
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
+    ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
+    ESP_ERROR_CHECK(esp_wifi_start() );
+
+    ESP_LOGI(TAG, "wifi_init_sta finished.");
+
+    /* 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 ap SSID:%s password:%s",
+                 EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
+    } else if (bits & WIFI_FAIL_BIT) {
+        ESP_LOGI(TAG, "Failed to connect to SSID:%s, password:%s",
+                 EXAMPLE_ESP_WIFI_SSID, EXAMPLE_ESP_WIFI_PASS);
+    } else {
+        ESP_LOGE(TAG, "UNEXPECTED EVENT");
+    }
+}