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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.h
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--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/components/libraries/bootloader/nrf_bootloader_wdt.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.
+ * 
+ */
+#ifndef NRF_BOOTLOADER_WDT_H
+#define NRF_BOOTLOADER_WDT_H
+
+/**@file
+ *
+ * @defgroup nrf_bootloader_wdt  Automated feeding of the watchdog
+ * @{
+ * @ingroup  nrf_bootloader
+ * @brief Module that keeps the WDT from timing out if the WDT has been started in the application.
+ */
+
+#include "sdk_errors.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/**
+ * @brief Function for checking whether the WDT peripheral is started and for getting its configuration.
+ *
+ * The module uses app_timer to start regular feeding of the watchdog. Timer interval
+ * is chosen based on watchdog settings. When @ref nrf_bootloader_wdt_feed is called, internal
+ * feeding is stopped assuming that the application takes responsibity of watchdog feeding.
+ * However, if @ref NRF_BL_WDT_MAX_SCHEDULER_LATENCY_MS or the watchdog is configured to
+ * run during sleep, then internal feeding (from app_timer handler context) is kept active.
+ */
+void nrf_bootloader_wdt_init(void);
+
+
+/**
+ * @brief Function for feeding the watchdog (if active).
+ */
+void nrf_bootloader_wdt_feed(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+/** @} */
+
+#endif //NRF_BOOTLOADER_WDT_H