Bluetooth Core Specification

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Bluetooth Core Specification
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Bluetooth Core Specification

Bluetooth ® Specification

Version 6.1
2025-04-29
This specification defines the technologies required to create interoperable Bluetooth devices.

Version: v6.1
Version Date: 2025-04-29
Prepared By: Core Specification Working Group

Disclaimer and Copyright Notice

Use of this specification is your acknowledgement that you agree to and will comply with the following notices and disclaimers. You are advised to seek appropriate legal, engineering, and other professional advice regarding the use, interpretation, and effect of this specification. Use of Bluetooth specifications by members of Bluetooth SIG is governed by the membership and other related agreements between Bluetooth SIG and its members, including those agreements posted on Bluetooth SIG’s website located at www.bluetooth.com. Any use of this specification by a member that is not in compliance with the applicable membership and other related agreements is prohibited and, among other things, may result in (i) termination of the applicable agreements and (ii) liability for infringement of the intellectual property rights of Bluetooth SIG and its members. This specification may provide options, because, for example, some products do not implement every portion of the specification. All content within the specification, including notes, appendices, figures, tables, message sequence charts, examples, sample data, and each option identified is intended to be within the bounds of the Scope as defined in the Bluetooth Patent/Copyright License Agreement (“PCLA”). Also, the identification of options for implementing a portion of the specification is intended to provide design flexibility without establishing, for purposes of the PCLA, that any of these options is a “technically reasonable non-infringing alternative.” Use of this specification by anyone who is not a member of Bluetooth SIG is prohibited and is an infringement of the intellectual property rights of Bluetooth SIG and its members. The furnishing of this specification does not grant any license to any intellectual property of Bluetooth SIG or its members. THIS SPECIFICATION IS PROVIDED “AS IS” AND BLUETOOTH SIG, ITS MEMBERS AND THEIR AFFILIATES MAKE NO REPRESENTATIONS OR WARRANTIES AND DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY WARRANTIES OF MERCHANTABILITY, TITLE, NON-INFRINGEMENT, FITNESS FOR ANY PARTICULAR PURPOSE, OR THAT THE CONTENT OF THIS SPECIFICATION IS FREE OF ERRORS. For the avoidance of doubt, Bluetooth SIG has not made any search or investigation as to third parties that may claim rights in or to any specifications or any intellectual property that may be required to implement any specifications and it disclaims any obligation or duty to do so. TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, BLUETOOTH SIG, ITS MEMBERS AND THEIR AFFILIATES DISCLAIM ALL LIABILITY ARISING OUT OF OR RELATING TO USE OF THIS SPECIFICATION AND ANY INFORMATION CONTAINED IN THIS SPECIFICATION, INCLUDING LOST REVENUE, PROFITS, DATA OR PROGRAMS, OR BUSINESS INTERRUPTION, OR FOR SPECIAL, INDIRECT, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, AND EVEN IF BLUETOOTH SIG, ITS MEMBERS OR THEIR AFFILIATES HAVE BEEN ADVISED OF THE POSSIBILITY OF THE DAMAGES. Products equipped with Bluetooth wireless technology (“Bluetooth Products”) and their combination, operation, use, implementation, and distribution may be subject to regulatory controls under the laws and regulations of numerous countries that regulate products that use wireless non-licensed spectrum. Examples include airline regulations, telecommunications regulations, technology transfer controls, and health and safety regulations. You are solely responsible for complying with all applicable laws and regulations and for obtaining any and all required authorizations, permits, or licenses in connection with your use of this specification and development, manufacture, and distribution of Bluetooth Products. Nothing in this specification provides any information or assistance in connection with complying with applicable laws or regulations or obtaining required authorizations, permits, or licenses. Bluetooth SIG is not required to adopt any specification or portion thereof. If this specification is not the final version adopted by Bluetooth SIG’s Board of Directors, it may not be adopted. Any specification adopted by Bluetooth SIG’s Board of Directors may be withdrawn, replaced, or modified at any time. Bluetooth SIG reserves the right to change or alter final specifications in accordance with its membership and operating agreements. Copyright © 1999–2025. All copyrights in the Bluetooth Specifications themselves are owned by Apple Inc., Ericsson AB, Intel Corporation, Google LLC, Lenovo (Singapore) Pte. Ltd., Microsoft Corporation, Nokia Corporation, and Toshiba Corporation. The Bluetooth word mark and logos are owned by Bluetooth SIG, Inc. Other third-party brands and names are the property of their respective owners.

Version History

The Version History is shown in [Vol 0] Part C .

Acknowledgments

The persons who contributed to this specification are listed in [Vol 0] Part C .

Web Site

This specification can also be found on the official Bluetooth web site: https://www.bluetooth.com/specifications/adopted-specifications
LL_ENC_REQ 03 17 03 90 78 56 34 12 ef cd ab 74 24 13 02 f1 e0 df ce bd ac 24
ab dc ba
Length 0x17
Control Type 0x03
Rand 90 78 56 34 12 ef cd ab
EDIV 74 24
SKD_C 13 02 f1 e0 df ce bd ac
IV_C 24 ab dc ba
LL_ENC_RSP 0b 0d 04 79 68 57 46 35 24 13 02 be ba af de
Length 0x0D
Control Type 0x04
SKD_P 79 68 57 46 35 24 13 02
IV_P be ba af de
LL_START_ENC_REQ 07 01 05
Length 0x01
Control Type 0x05

LL_START_ENC_RSP1 0f 05 9f cd a7 f4 48
Length 0x05
Control Type Encrypted:0x9F Clear:0x06
MIC (32-bit value MSO to LSO) 0xCDA7F448 (Note: MICs are sent MSO first on the air)

LL_START_ENC_RSP2 07 05 a3 4c 13 a4 15
Length 0x05S
Control Type Encrypted:0xA3 Clear:0x06
MIC (32-bit value MSO to LSO) 0x4C13A415
LL_DATA1 0e 1f 7a 70 d6 64 15 22 6d f2 6b 17 83 9a 06 04 05 59 6b d6 56 4f 79 6b 5b
9c e6 ff 32 f7 5a 6d 33
Length 0x1F (i.e. 27 + 4 = 31 dec)
Data (LSO to MSO)
Clear 17 00 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f 70 71 31 32 33 34 35 36
37 38 39 30
Encrypted 7a 70 d6 64 15 22 6d f2 6b 17 83 9a 06 04 05 59 6b d6 56 4f 79 6b 5b
9c e6 ff 32
MIC (32-bit value MSO to LSO) 0xF75A6D33
LL_DATA2 06 1f f3 88 81 e7 bd 94 c9 c3 69 b9 a6 68 46 dd 47 86 aa 8c 39 ce 54 0d 0d
ae 3a dc df 89 b9 60 88
Length 0x1F (i.e. 27 + 4 = 31 dec)
Data (LSO to MSO)
Clear 17 00 37 36 35 34 33 32 31 30 41 42 43 44 45 46 47 48 49 4a 4b 4c 4d
4e 4f 50 51
Encrypted f3 88 81 e7 bd 94 c9 c3 69 b9 a6 68 46 dd 47 86 aa 8c 39 ce 54 0d 0d
ae 3a dc df
MIC (32-bit value MSO to LSO) 0x89B96088
LL_START_ENC_RSP1 - 0f 05 9f cd a7 f4 48
Length: 05
Control Type:
Clear: 06
Encrypted: 9f
MIC: CD A7 F4 48
LL_START_ENC_RSP2 07 05 a3 4c 13 a4 15
Length: 05
Control Type:
Clear: 06
Encrypted: A3
MIC: 4c 13 a4 15
LL_DATA1 0E 1F 7A 70 D6 64 15 22 6D F2 6B 17 83 9A 06 04 05 59 6B D6
56 4F 79 6B 5B 9C E6 FF 32 F7 5A 6D 33
Length: 1F
Data:
Clear: 17 00 63 64 65 66 67 68 69 6a 6b 6c 6d 6e 6f 70 71 31
32 33 34 35 36 37 38 39 30
Encrypted: 7A 70 D6 64 15 22 6D F2 6B 17 83 9A 06 04 05 59 6B D6
56 4F 79 6B 5B 9C E6 FF 32
MIC: F7 5A 6D 33
LL_DATA2 06 1F F3 88 81 E7 BD 94 C9 C3 69 B9 A6 68 46 DD 47 86 AA 8C
39 CE 54 0D 0D AE 3A DC DF 89 B9 60 88
Length: 1F
Data:
Clear: 17 00 37 36 35 34 33 32 31 30 41 42 43 44 45 46 47 48
49 4a 4b 4c 4d 4e 4f 50 51
Encrypted: F3 88 81 E7 BD 94 C9 C3 69 B9 A6 68 46 DD 47 86 AA 8C
39 CE 54 0D 0D AE 3A DC DF

MIC: 89 B9 60 88

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