feat(tcpip_adapter): Add tcpip_adapter and make wifi independent with lwip

components/tcpip_adapter/include/tcpip_adapter.h

@@ -0,0 +1,62 @@
+// 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 _TCPIP_ADAPTER_H_
+#define _TCPIP_ADAPTER_H_
+
+#include "sdkconfig.h"
+/**
+ * @brief TCPIP adapter library
+ *
+ * The aim of this adapter is to provide an abstract layer upon TCPIP stack.
+ * With this layer, switch to other TCPIP stack is possible and easy in ESP8266_RTOS_SDK.
+ *
+ * If users want to use other TCPIP stack, all those functions should be implemented
+ * by using the specific APIs of that stack.
+ *
+ * tcpip_adapter_init should be called in the start of app_main for only once.
+ *
+ * Currently most adapter APIs are called in event_default_handlers.c.
+ *
+ * We recommend users only use set/get IP APIs, DHCP server/client APIs,
+ * get free station list APIs in application side. Other APIs are used in ESP8266_RTOS_SDK internal,
+ * otherwise the state maybe wrong.
+ *
+ */
+
+typedef enum {
+    TCPIP_ADAPTER_IF_STA = 0,     /**< ESP8266 station interface */
+    TCPIP_ADAPTER_IF_AP,          /**< ESP8266 soft-AP interface */
+    TCPIP_ADAPTER_IF_MAX
+} tcpip_adapter_if_t;
+
+struct netif *esp_netif[TCPIP_ADAPTER_IF_MAX];
+char* hostname;
+bool default_hostname;
+
+#define TCPIP_ADAPTER_IF_VALID(fd) ((fd < TCPIP_ADAPTER_IF_MAX) ? 1 : 0)
+
+/* Define those to better describe your network interface. */
+#define IFNAME0 'e'
+#define IFNAME1 'n'
+
+#ifdef CONFIG_TCPIP_ADAPER_DEBUG
+#define TAG ""
+#define TCPIP_ATAPTER_LOG(str, ...) printf(TAG __FILE__ " line: %d " str, __LINE__, ##__VA_ARGS__)
+#else
+#define TCPIP_ATAPTER_LOG(str, ...)
+#endif
+
+
+#endif /*  _TCPIP_ADAPTER_H_ */