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diff --git a/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/include/mbedtls/error.h b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/include/mbedtls/error.h
new file mode 100644
index 0000000..5e549f6
--- /dev/null
+++ b/thirdparty/nRF5_SDK_15.0.0_a53641a/external/mbedtls/include/mbedtls/error.h
@@ -0,0 +1,107 @@
+/**
+ * \file error.h
+ *
+ * \brief Error to string translation
+ *
+ *  Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  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.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+#ifndef MBEDTLS_ERROR_H
+#define MBEDTLS_ERROR_H
+
+#include <stddef.h>
+
+/**
+ * Error code layout.
+ *
+ * Currently we try to keep all error codes within the negative space of 16
+ * bits signed integers to support all platforms (-0x0001 - -0x7FFF). In
+ * addition we'd like to give two layers of information on the error if
+ * possible.
+ *
+ * For that purpose the error codes are segmented in the following manner:
+ *
+ * 16 bit error code bit-segmentation
+ *
+ * 1 bit  - Unused (sign bit)
+ * 3 bits - High level module ID
+ * 5 bits - Module-dependent error code
+ * 7 bits - Low level module errors
+ *
+ * For historical reasons, low-level error codes are divided in even and odd,
+ * even codes were assigned first, and -1 is reserved for other errors.
+ *
+ * Low-level module errors (0x0002-0x007E, 0x0003-0x007F)
+ *
+ * Module   Nr  Codes assigned
+ * MPI       7  0x0002-0x0010
+ * GCM       2  0x0012-0x0014
+ * BLOWFISH  2  0x0016-0x0018
+ * THREADING 3  0x001A-0x001E
+ * AES       2  0x0020-0x0022
+ * CAMELLIA  2  0x0024-0x0026
+ * XTEA      1  0x0028-0x0028
+ * BASE64    2  0x002A-0x002C
+ * OID       1  0x002E-0x002E   0x000B-0x000B
+ * PADLOCK   1  0x0030-0x0030
+ * DES       1  0x0032-0x0032
+ * CTR_DBRG  4  0x0034-0x003A
+ * ENTROPY   3  0x003C-0x0040   0x003D-0x003F
+ * NET      11  0x0042-0x0052   0x0043-0x0045
+ * ASN1      7  0x0060-0x006C
+ * PBKDF2    1  0x007C-0x007C
+ * HMAC_DRBG 4  0x0003-0x0009
+ * CCM       2                  0x000D-0x000F
+ *
+ * High-level module nr (3 bits - 0x0...-0x7...)
+ * Name      ID  Nr of Errors
+ * PEM       1   9
+ * PKCS#12   1   4 (Started from top)
+ * X509      2   19
+ * PKCS5     2   4 (Started from top)
+ * DHM       3   9
+ * PK        3   14 (Started from top)
+ * RSA       4   9
+ * ECP       4   8 (Started from top)
+ * MD        5   4
+ * CIPHER    6   6
+ * SSL       6   17 (Started from top)
+ * SSL       7   31
+ *
+ * Module dependent error code (5 bits 0x.00.-0x.F8.)
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief Translate a mbed TLS error code into a string representation,
+ *        Result is truncated if necessary and always includes a terminating
+ *        null byte.
+ *
+ * \param errnum    error code
+ * \param buffer    buffer to place representation in
+ * \param buflen    length of the buffer
+ */
+void mbedtls_strerror( int errnum, char *buffer, size_t buflen );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* error.h */