Update IDF to a0468b2 (#2108)

* Update IDF to a0468b2

* add missing ld file

* Fix PIO builds and change coex policy

tools/sdk/include/protocomm/protocomm_console.h

@@ -0,0 +1,59 @@
+// 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.
+
+#pragma once
+
+#include <protocomm.h>
+
+#define PROTOCOMM_CONSOLE_DEFAULT_CONFIG() { \
+    .stack_size     = 4096,                  \
+    .task_priority  = tskIDLE_PRIORITY + 3,  \
+}
+
+/**
+ * @brief   Config parameters for protocomm console
+ */
+typedef struct {
+    size_t   stack_size;        /*!< Stack size of console taks */
+    unsigned task_priority;     /*!< Priority of console task */
+} protocomm_console_config_t;
+
+/**
+ * @brief   Start console based protocomm transport
+ *
+ * @note    This is a singleton. ie. Protocomm can have multiple instances, but only
+ *          one instance can be bound to a console based transport layer.
+ *
+ * @param[in] pc     Protocomm instance pointer obtained from protocomm_new()
+ * @param[in] config Config param structure for protocomm console
+ *
+ * @return
+ *  - ESP_OK : Server started succefully
+ *  - ESP_ERR_INVALID_ARG : Null arguments
+ *  - ESP_ERR_NOT_SUPPORTED : Transport layer bound to another protocomm instance
+ *  - ESP_ERR_INVALID_STATE : Transport layer already bound to this protocomm instance
+ *  - ESP_FAIL : Failed to start console thread
+ */
+esp_err_t protocomm_console_start(protocomm_t *pc, const protocomm_console_config_t *config);
+
+/**
+ * @brief   Stop console protocomm transport
+ *
+ * @param[in] pc    Same protocomm instance that was passed to protocomm_console_start()
+ *
+ * @return
+ *  - ESP_OK : Server stopped succefully
+ *  - ESP_ERR_INVALID_ARG : Null / incorrect protocomm instance pointer
+ */
+esp_err_t protocomm_console_stop(protocomm_t *pc);