From 8c950eb6a135ab1847d8a0c01f9eb95fd14e8f58 Mon Sep 17 00:00:00 2001
From: a <pinkit-cwa@pinkit.de>
Date: Fri, 21 Aug 2020 02:29:19 +0200
Subject: [PATCH] added 4.0 version of wifi.c

---
 main/wifi/espidf-v4.0.c | 162 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 162 insertions(+)
 create mode 100644 main/wifi/espidf-v4.0.c

diff --git a/main/wifi/espidf-v4.0.c b/main/wifi/espidf-v4.0.c
new file mode 100644
index 0000000..84b21ad
--- /dev/null
+++ b/main/wifi/espidf-v4.0.c
@@ -0,0 +1,162 @@
+#ifdef FRAMEWORK_espidf
+// Copyright 2020 Lukas Haubaum
+//
+// Licensed under the GNU Affero General Public License, Version 3;
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     https://www.gnu.org/licenses/agpl-3.0.html
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+#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"
+
+#include "ena-cwa.h"
+
+#include "wifi.h"
+
+#define WIFI_CONNECTED_BIT BIT0
+#define WIFI_FAIL_BIT BIT1
+
+static EventGroupHandle_t s_wifi_event_group;
+
+static int s_retry_num = 0;
+
+static bool connected = false;
+
+void wifi_stop(void)
+{
+    connected = false;
+    esp_wifi_stop();
+    esp_wifi_deinit();
+    esp_event_loop_delete_default();
+}
+
+static esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    switch (event->event_id) {
+    case SYSTEM_EVENT_STA_START:
+        esp_wifi_connect();
+        break;
+    case SYSTEM_EVENT_STA_DISCONNECTED:
+        if (s_retry_num < WIFI_MAXIMUM_RETRY)
+        {
+	    esp_wifi_connect();
+            s_retry_num++;
+            ESP_LOGD(WIFI_LOG, "retry to connect to the AP");
+	}
+	else
+	{
+            xEventGroupSetBits(s_wifi_event_group, WIFI_FAIL_BIT);
+	}
+        ESP_LOGD(WIFI_LOG, "connect to the AP fail");
+	connected = false;
+        break;
+    case SYSTEM_EVENT_STA_GOT_IP:
+        s_retry_num = 0;
+        xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+        connected = true;
+
+        heap_caps_check_integrity_all(true);
+        break;
+    default:
+        ESP_LOGD(WIFI_LOG, "eventbase WIFI, eventid %d", event->event_id);
+        break;
+    }
+    return ESP_OK;
+}
+
+void wifi_start(void)
+{
+
+    // init NVS for WIFI
+    esp_err_t ret;
+    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());
+        ESP_ERROR_CHECK(nvs_flash_init());
+    }
+
+    s_wifi_event_group = xEventGroupCreate();
+
+    ESP_ERROR_CHECK(esp_event_loop_create_default());
+
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL) );
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK(esp_wifi_init(&cfg));
+    ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
+
+
+    wifi_config_t wifi_config = {
+        .sta = {
+            .ssid = WIFI_SSID,
+            .password = WIFI_PASSWORD,
+            /* Setting a password implies station will connect to all security modes including WEP/WPA.
+             * However these modes are deprecated and not advisable to be used. Incase your Access point
+             * doesn't support WPA2, these mode can be enabled by commenting below line */
+            .threshold.authmode = WIFI_AUTH_WPA2_PSK,
+
+            .pmf_cfg = {
+                .capable = true,
+                .required = false},
+        },
+    };
+    ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+    ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
+    ESP_ERROR_CHECK(esp_wifi_start());
+
+    /* 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_LOGV(WIFI_LOG, "connected to ap SSID:%s",
+                 WIFI_SSID);
+    }
+    else if (bits & WIFI_FAIL_BIT)
+    {
+        ESP_LOGI(WIFI_LOG, "Failed to connect to SSID:%s",
+                 WIFI_SSID);
+    }
+    else
+    {
+        ESP_LOGE(WIFI_LOG, "UNEXPECTED EVENT");
+    }
+
+#if 0
+    /* The event will not be processed after unregister */
+    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(IP_EVENT, IP_EVENT_STA_GOT_IP, instance_got_ip));
+    ESP_ERROR_CHECK(esp_event_handler_instance_unregister(WIFI_EVENT, ESP_EVENT_ANY_ID, instance_any_id));
+    vEventGroupDelete(s_wifi_event_group);
+#endif
+}
+
+bool wifi_is_connected(void)
+{
+    return connected;
+}
+#endif