Update IDF to 3.2-3276a13 and esptool.py to 2.5.0 (#1878)

* TX Flow Control and Code cleanup

* Use semaphore instead of delay

TX functionality is done.

* Use single buffer and empty queue on exit

* Fix compile issues because of LwIP code relocation

* Add temporary header to fix Azure not compiling

* Fix AsyncUDP early init

* AsyncUDP Multicast fixes

* Add source mac address and rework multicast

* Allow redefinition of default pins for Serials 1 and 2

* Update IDF to 3276a13

* Update esptool.py to 2.5.0

* Fix sketches

* Fix log level in BluetoothSetial

tools/sdk/include/tcp_transport/transport_ssl.h

@@ -0,0 +1,48 @@
+// 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 _TRANSPORT_SSL_H_
+#define _TRANSPORT_SSL_H_
+
+#include "transport.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * @brief       Create new SSL transport, the transport handle must be release transport_destroy callback
+ *
+ * @return      the allocated transport_handle_t, or NULL if the handle can not be allocated
+ */
+transport_handle_t transport_ssl_init();
+
+/**
+ * @brief      Set SSL certificate data (as PEM format).
+ *             Note that, this function stores the pointer to data, rather than making a copy.
+ *             So we need to make sure to keep the data lifetime before cleanup the connection
+ *
+ * @param      t     ssl transport
+ * @param[in]  data  The pem data
+ * @param[in]  len   The length
+ */
+void transport_ssl_set_cert_data(transport_handle_t t, const char *data, int len);
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif
+