feat(wifi): Add wifi APIs according to IDF

components/esp8266/include/esp_interface.h

@@ -0,0 +1,36 @@
+// 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_INTERFACE_H__
+#define __ESP_INTERFACE_H__
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    ESP_IF_WIFI_STA = 0,     /**< ESP8266 station interface */
+    ESP_IF_WIFI_AP,          /**< ESP8266 soft-AP interface */
+    ESP_IF_MAX
+} esp_interface_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* __ESP_INTERFACE_TYPES_H__ */