DVK-BTM411 Laird Technologies, DVK-BTM411 Datasheet - Page 19

• Manufacturer Part Number: DVK-BTM411
• Description: BLUETOOTH EVAL BOARD BTM411
• Manufacturer: Laird Technologies
• Type: Transceiverr

Specifications of DVK-BTM411

• Frequency: 2.4GHz
• Wireless Frequency: 2.402 GHz to 2.48 GHz
• Interface Type: UART
• Data Rate: 2.1 Mbps
• Operating Voltage: 3 V to 3.3 V
• Antenna: Multilayer Ceramic Integrated
• Operating Temperature Range: - 30 C to + 70 C
• Output Power: 4 dBm
• Technology/ Type: Development Kit
• For Use With/related Products: BTM411
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: DVK-BTM411

BTM410/411
Bluetooth
AT COMMAND SET
REFERENCE
19 www.lairdtech.com
®
AT Data Module
Secure Simple Pairing (SSP)
Secure Simple Pairing (SSP) has been introduced since Bluetooth 2.1 + EDR. It aims to increase the security
provided by a Bluetooth link whilst making the pairing process more user friendly.
There are white papers about SSP available through the internet (provided by the Bluetooth SIG and other
companies), explaining the mechanisms and backgrounds of SSP. They can be found by searching the
internet for e.g. “Bluetooth Secure Simple Pairing”. Please familiarize with those documents to get a better
understanding of SSP and the following settings.
6. AT+BTE=”<EIR-Data>”
7. AT+BTE? {Query outgoing EIR Data}
1. Security Level (S320)
This command sets up outgoing EIR (extended inquiry response) data.
Format: <EIR-Data> = printable ASCII character whenever possible, otherwise a 2 digit hexadecimal
with preceding ‘\’ presenting one byte. Please note that the given data is written to baseband as it
is (raw data) and no checks on the data format is performed. Hence, the user is responsible for writing
data that corresponds to the extended inquiry response data format as described in the Bluetooth
Specification Version 2.1 + EDR [1], vol3, Part C – Generic Access Profile, 8 Extended Inquiry Response
Data Format (page 1305 in the .pdf-file).
Response: <cr,lf>OK<cr,lf>
This command prints the outgoing EIR data that is currently set up
Response:
<cr,lf>
<EIR-Data>
<cr,lf>OK<cr,lf>
The security level is defined in the BT2.1+EDR specification [1], vol3, Generic Access Profile (Table 5.7).
There are 4 Levels providing different levels of security:
The security level is defined by S Register 320 and is referenced at boot time only. Hence the register
must be saved by “AT&W “ and the module must be power cycled (or “ATZ”) subsequently.
S320 = 3 will overwrite the setting of S Register 322 (enable MITM).
The security level will remain the same until next power cycle and is valid for all profiles and services
of the module. For SDP (service discovery profile), security level 0 is always assigned internally.
Security Level
Level 3
Level 2
Level 1
Level 0
(1) Although encryption is not necessary for security level 1, encryption will always be enabled
because this specification mandates encryption for all services other than SDP (service discovery).
Characteristics
• MITM protection (MITM = “Man in the
• Encryption
• User interaction
• No MITM protection
• Encryption
• No MITM protection
• (No) Encryption (1)
• Minimal user interaction
• No MITM protection
• No Encryption
• Minimal user interaction
Middle” attack)
{Set up outgoing EIR Data}
Table 3.3: Security Levels
Comment
High security
Medium Security
Low Security
Permitted only for service
discovery
Laird Technologies