feat(wifi): Add wifi event APIs according to IDF

components/esp8266/source/event_default_handlers.c

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+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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 <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "esp_err.h"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "esp_event_loop.h"
+#include "esp_system.h"
+
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "freertos/queue.h"
+#include "freertos/semphr.h"
+
+#include "tcpip_adapter.h"
+#include "esp_log.h"
+
+static const char* TAG = "event";
+
+typedef esp_err_t (*system_event_handler_t)(system_event_t *e);
+
+static esp_err_t system_event_ap_start_handle_default(system_event_t *event);
+static esp_err_t system_event_ap_stop_handle_default(system_event_t *event);
+static esp_err_t system_event_sta_start_handle_default(system_event_t *event);
+static esp_err_t system_event_sta_stop_handle_default(system_event_t *event);
+static esp_err_t system_event_sta_connected_handle_default(system_event_t *event);
+static esp_err_t system_event_sta_disconnected_handle_default(system_event_t *event);
+static esp_err_t system_event_sta_got_ip_default(system_event_t *event);
+static esp_err_t system_event_sta_lost_ip_default(system_event_t *event);
+
+/* Default event handler functions
+
+   Any entry in this table which is disabled by config will have a NULL handler.
+*/
+static system_event_handler_t default_event_handlers[SYSTEM_EVENT_MAX] = { 0 };
+
+static esp_err_t system_event_sta_got_ip_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+static esp_err_t system_event_sta_lost_ip_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+esp_err_t system_event_ap_start_handle_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+esp_err_t system_event_ap_stop_handle_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+esp_err_t system_event_sta_start_handle_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+esp_err_t system_event_sta_stop_handle_default(system_event_t *event)
+{
+
+    return ESP_OK;
+}
+
+esp_err_t system_event_sta_connected_handle_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+esp_err_t system_event_sta_disconnected_handle_default(system_event_t *event)
+{
+    return ESP_OK;
+}
+
+
+
+esp_err_t esp_event_process_default(system_event_t *event)
+{
+    if (event == NULL) {
+        return ESP_FAIL;
+    }
+
+    if ((event->event_id < SYSTEM_EVENT_MAX)) {
+        if (default_event_handlers[event->event_id] != NULL) {
+            default_event_handlers[event->event_id](event);
+        }
+    } else {
+        return ESP_FAIL;
+    }
+    return ESP_OK;
+}
+
+void esp_event_set_default_wifi_handlers()
+{
+     default_event_handlers[SYSTEM_EVENT_STA_START]        = system_event_sta_start_handle_default;
+     default_event_handlers[SYSTEM_EVENT_STA_STOP]         = system_event_sta_stop_handle_default;
+     default_event_handlers[SYSTEM_EVENT_STA_CONNECTED]    = system_event_sta_connected_handle_default;
+     default_event_handlers[SYSTEM_EVENT_STA_DISCONNECTED] = system_event_sta_disconnected_handle_default;
+     default_event_handlers[SYSTEM_EVENT_STA_GOT_IP]       = system_event_sta_got_ip_default;
+     default_event_handlers[SYSTEM_EVENT_STA_LOST_IP]      = system_event_sta_lost_ip_default;
+     default_event_handlers[SYSTEM_EVENT_AP_START]         = system_event_ap_start_handle_default;
+     default_event_handlers[SYSTEM_EVENT_AP_STOP]          = system_event_ap_stop_handle_default;
+}

components/esp8266/source/event_loop.c

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+// Copyright 2018 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// 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 <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "esp_err.h"
+#include "esp_wifi.h"
+#include "esp_event.h"
+#include "esp_event_loop.h"
+#include "esp_wifi_osi.h"
+
+#include "esp_log.h"
+#include "sdkconfig.h"
+
+static const char* TAG = "event";
+static bool s_event_init_flag = false;
+static system_event_cb_t s_event_handler_cb = NULL;
+static void *s_event_ctx = NULL;
+static void *s_event_queue = NULL;
+
+
+static esp_err_t esp_event_post_to_user(system_event_t *event)
+{
+    if (s_event_handler_cb) {
+        return (*s_event_handler_cb)(s_event_ctx, event);
+    }
+    return ESP_OK;
+}
+
+system_event_cb_t esp_event_loop_set_cb(system_event_cb_t cb, void *ctx)
+{
+    system_event_cb_t old_cb = s_event_handler_cb;
+    s_event_handler_cb = cb;
+    s_event_ctx = ctx;
+    return old_cb;
+}
+
+esp_err_t esp_event_send(system_event_t *event)
+{
+    if (s_event_queue == NULL) {
+        ESP_LOGE(TAG, "Event loop not initialized via esp_event_loop_init, but esp_event_send called");
+        return ESP_ERR_INVALID_STATE;
+    }
+
+    portBASE_TYPE ret = wifi_queue_send(s_event_queue, event, 0, 1);
+    if (ret != pdPASS) {
+        if (event) {
+            ESP_LOGE(TAG, "e=%d f", event->event_id);
+        } else {
+            ESP_LOGE(TAG, "e null");
+        }
+        return ESP_FAIL;
+    }
+    return ESP_OK;
+}
+
+static void esp_event_loop_task(void *pvParameters)
+{
+    while (1) {
+        system_event_t evt;
+        if (wifi_queue_recv(s_event_queue, &evt, OSI_FUNCS_TIME_BLOCKING) == pdPASS) {
+            esp_err_t ret = esp_event_process_default(&evt);
+            if (ret != ESP_OK) {
+                ESP_LOGE(TAG, "default event handler failed!");
+            }
+            ret = esp_event_post_to_user(&evt);
+            if (ret != ESP_OK) {
+                ESP_LOGE(TAG, "post event to user fail!");
+            }
+        } else {
+            ESP_LOGE(TAG, "esp_event_loop_task end");            
+        }
+    }
+}
+
+QueueHandle_t esp_event_loop_get_queue(void)
+{
+    return s_event_queue;
+}
+
+esp_err_t esp_event_loop_init(system_event_cb_t cb, void *ctx)
+{
+    if (s_event_init_flag) {
+        return ESP_FAIL;
+    }
+    s_event_handler_cb = cb;
+    s_event_ctx = ctx;
+    s_event_queue = wifi_queue_create(32, sizeof(system_event_t));
+    if(s_event_queue == NULL)
+        return ESP_ERR_NO_MEM;
+    if(wifi_task_create(esp_event_loop_task, "esp_event_loop_task", 2048, NULL, 2) == NULL) {
+        return ESP_ERR_NO_MEM;
+    }
+    s_event_handler_cb = cb;
+    s_event_ctx = ctx;
+    s_event_init_flag = true;
+    return ESP_OK;
+}