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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/background_dfu/transport/background_dfu_transport.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/iot/background_dfu/transport/background_dfu_transport.h
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+/**
+ * Copyright (c) 2017 - 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
+ *
+ * @defgroup background_dfu_transport background_dfu_state.h
+ * @{
+ * @ingroup background_dfu
+ * @brief Background DFU transport API.
+ *
+ */
+
+#ifndef BACKGROUND_DFU_TRANSPORT_H_
+#define BACKGROUND_DFU_TRANSPORT_H_
+
+#include "background_dfu_state.h"
+
+/**@brief Create and send DFU block request with missing blocks.
+ *
+ * This function is used in multicast DFU.
+ *
+ * @param[in] p_dfu_ctx A pointer to the background DFU context.
+ * @param[in] p_req_bmp A pointer to the bitmap structure that shall be sent.
+ */
+void background_dfu_transport_block_request_send(background_dfu_context_t        * p_dfu_ctx,
+                                                 background_dfu_request_bitmap_t * p_req_bmp);
+
+/**@brief Send background DFU request, based on DFU state.
+ *
+ * @param[in] p_dfu_ctx A pointer to the background DFU context.
+ */
+void background_dfu_transport_send_request(background_dfu_context_t * p_dfu_ctx);
+
+/**@brief Update background DFU transport state.
+ *
+ * @param[in] p_dfu_ctx A pointer to the background DFU context.
+ */
+void background_dfu_transport_state_update(background_dfu_context_t * p_dfu_ctx);
+
+/**@brief Get random value.
+ *
+ * @returns A random value of uint32_t type.
+ */
+uint32_t background_dfu_random(void);
+
+/** @brief Handle DFU error.
+ *
+ *  Notify transport about DFU error.
+ */
+void background_dfu_handle_error(void);
+
+#endif /* BACKGROUND_DFU_COAP_H_ */
+
+/** @} */