Basic ESP-IDF wifi connect

ESPTest/CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required(VERSION 3.16.0)
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(ESPTest)

ESPTest/platformio.ini

@@ -8,18 +8,8 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
-[platformio]
-default_envs = esp8266
-
-[env:esp32]
+[env:az-delivery-devkit-v4]
 platform = espressif32
-board = esp32dev
-framework = arduino
+board = az-delivery-devkit-v4
+framework = espidf
 monitor_speed = 115200
-
-[env:esp8266]
-platform = espressif8266
-board = d1_mini
-framework = arduino
-monitor_speed = 115200
-

ESPTest/src/CMakeLists.txt

@@ -0,0 +1,6 @@
+# This file was automatically generated for projects
+# without default 'CMakeLists.txt' file.
+
+FILE(GLOB_RECURSE app_sources ${CMAKE_SOURCE_DIR}/src/*.*)
+
+idf_component_register(SRCS ${app_sources})

ESPTest/src/main.c

@@ -0,0 +1,131 @@
+#include "theSecrets.h"
+#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 "nvs_flash.h"
+
+#include "lwip/err.h"
+#include "lwip/sys.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;
+
+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 < 10)
+        {
+            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_init_sta(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 = SSID,
+            .password = PSK,
+        },
+    };
+    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");
+    }
+    else if (bits & WIFI_FAIL_BIT)
+    {
+        ESP_LOGI(TAG, "Failed to connect");
+    }
+    else
+    {
+        ESP_LOGE(TAG, "UNEXPECTED EVENT");
+    }
+}
+
+void app_main(void)
+{
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND)
+    {
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    ESP_LOGI(TAG, "ESP_WIFI_MODE_STA");
+    wifi_init_sta();
+}

ESPTest/src/main.cpp

@@ -1,66 +0,0 @@
-#include <Arduino.h>
-#include "theSecrets.h"
-
-#ifdef ESP32
-#include "WiFi.h"
-#elif defined(ESP8266)
-#include "ESP8266WiFi.h"
-#define LED 2
-#define DELAY 2000
-#endif
-
-void toggleLED()
-{
-  if (digitalRead(LED) == LOW)
-    digitalWrite(LED, HIGH);
-  else
-    digitalWrite(LED, LOW);
-}
-
-uint8_t temp = 0;
-void packet_cb(uint8 *buf, uint16 len)
-{
-  if (temp < 20)
-  {
-    temp++;
-    Serial.printf("%5d", len);
-  }
-  else
-  {
-    temp = 0;
-    Serial.println();
-  }
-}
-
-void setup()
-{
-#ifdef ESP8266
-  pinMode(LED, OUTPUT);
-#endif
-  Serial.begin(115200);
-  Serial.println();
-  WiFi.begin(ssid, psk);
-  while (!WiFi.isConnected())
-  {
-#ifdef ESP8266
-    toggleLED();
-#endif
-    Serial.print(".");
-    delay(200);
-  }
-  Serial.println();
-  Serial.print("IP: ");
-  Serial.println(WiFi.localIP());
-  wifi_promiscuous_enable(true);
-  wifi_set_promiscuous_rx_cb(packet_cb);
-}
-
-void loop()
-{
-#ifdef ESP8266
-  digitalWrite(LED, LOW);
-  delay(DELAY);
-  digitalWrite(LED, HIGH);
-  delay(DELAY);
-#endif
-}