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+/**
+ * Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
+ * 
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form, except as embedded into a Nordic
+ *    Semiconductor ASA integrated circuit in a product or a software update for
+ *    such product, must reproduce the above copyright notice, this list of
+ *    conditions and the following disclaimer in the documentation and/or other
+ *    materials provided with the distribution.
+ * 
+ * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ * 
+ * 4. This software, with or without modification, must only be used with a
+ *    Nordic Semiconductor ASA integrated circuit.
+ * 
+ * 5. Any software provided in binary form under this license must not be reverse
+ *    engineered, decompiled, modified and/or disassembled.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY, NONINFRINGEMENT, AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL NORDIC SEMICONDUCTOR ASA OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
+ * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ */
+/** @file coap.h
+ *
+ * @defgroup iot_sdk_coap_api CoAP interface
+ * @ingroup iot_sdk_coap
+ * @{
+ * @brief Interface for the CoAP protocol.
+ */
+
+#ifndef COAP_H__
+#define COAP_H__
+
+#include "iot_errors.h"
+#include "coap_api.h"
+#include "sdk_os.h"
+
+/**
+ * @defgroup iot_coap_log Module's Log Macros
+ * @details Macros used for creating module logs which can be useful in understanding handling
+ *          of events or actions on API requests. These are intended for debugging purposes and
+ *          can be enabled by defining the COAP_ENABLE_LOGS to 1.
+ * @note If NRF_LOG_ENABLED is disabled, having COAP_ENABLE_LOGS has no effect.
+ * @{
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if (COAP_DISABLE_API_PARAM_CHECK == 0)
+
+/**@brief Verify NULL parameters are not passed to API by application. */
+#define NULL_PARAM_CHECK(PARAM)                                                                    \
+    if ((PARAM) == NULL)                                                                           \
+    {                                                                                              \
+        return (NRF_ERROR_NULL | IOT_COAP_ERR_BASE);                                               \
+    }
+
+/**@brief Verify that parameter members has been set by the application. */
+#define NULL_PARAM_MEMBER_CHECK(PARAM)                                                             \
+    if ((PARAM) == NULL)                                                                           \
+    {                                                                                              \
+        return (NRF_ERROR_INVALID_PARAM | IOT_COAP_ERR_BASE);                                      \
+    }
+#else
+
+#define NULL_PARAM_CHECK(PARAM)
+#define NULL_PARAM_MEMBER_CHECK(PARAM)
+
+#endif // COAP_DISABLE_API_PARAM_CHECK
+
+/**
+ * @defgroup iot_coap_mutex_lock_unlock Module's Mutex Lock/Unlock Macros.
+ *
+ * @details Macros used to lock and unlock modules. Currently, SDK does not use mutexes but
+ *          framework is provided in case the need to use an alternative architecture arises.
+ * @{
+ */
+#define COAP_MUTEX_LOCK()   SDK_MUTEX_LOCK(m_coap_mutex)                                 /**< Lock module using mutex */
+#define COAP_MUTEX_UNLOCK() SDK_MUTEX_UNLOCK(m_coap_mutex)                               /**< Unlock module using mutex */
+
+SDK_MUTEX_DEFINE(m_coap_mutex)
+
+/** @} */
+
+/**@brief Sends a CoAP message.
+ *
+ * @details Sends out a request using the underlying transport layer. Before sending, the
+ *          \ref coap_message_t structure is serialized and added to an internal message queue
+ *          in the library.  The handle returned can be used to abort the message from being
+ *          retransmitted at any time.
+ *
+ * @param[out] p_handle  Handle to the message if CoAP CON/ACK messages has been used. Returned
+ *                       by reference.
+ * @param[in]  p_message Message to be sent.
+ *
+ * @retval NRF_SUCCESS If the message was successfully encoded and scheduled for transmission.
+ */
+uint32_t internal_coap_message_send(uint32_t * p_handle, coap_message_t * p_message);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // COAP_H__
+
+/** @} */