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

components/esp8266/include/esp_event_loop.h

@@ -0,0 +1,81 @@
+// 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.
+
+#ifndef __ESP_EVENT_LOOP_H__
+#define __ESP_EVENT_LOOP_H__
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "esp_err.h"
+#include "esp_event.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/queue.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+  * @brief  Application specified event callback function
+  *
+  * @param  void *ctx : reserved for user
+  * @param  system_event_t *event : event type defined in this file
+  *
+  * @return ESP_OK : succeed
+  * @return others : fail
+  */
+typedef esp_err_t (*system_event_cb_t)(void *ctx, system_event_t *event);
+
+/**
+  * @brief  Initialize event loop
+  *         Create the event handler and task
+  *
+  * @param  system_event_cb_t cb : application specified event callback, it can be modified by call esp_event_set_cb
+  * @param  void *ctx : reserved for user
+  *
+  * @return ESP_OK : succeed
+  * @return others : fail
+  */
+esp_err_t esp_event_loop_init(system_event_cb_t cb, void *ctx);
+
+/**
+  * @brief  Set application specified event callback function
+  *
+  * @attention 1. If cb is NULL, means application don't need to handle
+  *               If cb is not NULL, it will be call when an event is received, after the default event callback is completed
+  *
+  * @param  system_event_cb_t cb : callback
+  * @param  void *ctx : reserved for user
+  *
+  * @return system_event_cb_t : old callback
+  */
+system_event_cb_t esp_event_loop_set_cb(system_event_cb_t cb, void *ctx);
+
+/**
+  * @brief  Get the queue used by event loop
+  *
+  * @attention : currently this API is used to initialize "q" parameter
+  * of wifi_init structure.
+  *
+  * @return QueueHandle_t : event queue handle
+  */
+QueueHandle_t esp_event_loop_get_queue(void);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __ESP_EVENT_LOOP_H__ */