Add support outbox, changed API

lib/include/platform.h

@@ -0,0 +1,24 @@
+
+// Copyright 2015-2018 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 _PLATFORM_H__
+#define _PLATFORM_H__
+
+//Support ESP32
+#ifdef ESP_PLATFORM
+#include "platform_esp32_idf.h"
+#endif
+
+#endif