connect to wifi via sdkconfig

Signed-off-by: Peter Siegmund <peter@rdkr.com>

ePaper-ESP-IDF/components/connectivity/CMakeLists.txt

@@ -0,0 +1,5 @@
+idf_component_register(SRCS "connectivity.c"
+                    INCLUDE_DIRS "include"
+                    PRIV_REQUIRES 
+                        esp_event
+                        esp_wifi)

ePaper-ESP-IDF/components/connectivity/connectivity.c

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+#include "connectivity.h"
+#include <string.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 "sdkconfig.h"
+
+/* FreeRTOS event group to signal when we are connected*/
+static EventGroupHandle_t s_wifi_event_group;
+
+/* 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
+
+static const char* TAG = "wifi station";
+
+static int s_retry_num = 0;
+
+#define WIFI_SSID CONFIG_WIFI_SSID
+#define WIFI_PASS CONFIG_WIFI_PASSWORD
+
+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 (s_retry_num < CONFIG_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);
+  }
+}
+
+uint8_t init_wifi(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 = WIFI_SSID,
+              .password = WIFI_PASS,
+          },
+  };
+  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", WIFI_SSID);
+    return 0;
+  } else if (bits & WIFI_FAIL_BIT) {
+    ESP_LOGI(TAG, "Failed to connect to SSID:%s", WIFI_SSID);
+    return 1;
+  } else {
+    ESP_LOGE(TAG, "UNEXPECTED EVENT");
+    return -1;
+  }
+}

ePaper-ESP-IDF/components/connectivity/include/connectivity.h

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+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+uint8_t init_wifi(void);
+#ifdef __cplusplus
+}
+#endif