DVK-BTM521 Laird Technologies, DVK-BTM521 Datasheet - Page 23

• Manufacturer Part Number: DVK-BTM521
• Description: BT MM DEV KIT
• Manufacturer: Laird Technologies
• Type: Transceiver, Bluetoothr

Specifications of DVK-BTM521

• Frequency: 2.4GHz
• Interface Type: RS-232
• Processor Series: BTM521
• Silicon Manufacturer: Laird Technologies
• Kit Application Type: Communication & Networking
• Application Sub Type: Bluetooth
• Kit Contents: Development Board & Software Tools
• Features: Supports CSR
• Rohs Compliant: Yes
• For Use With/related Products: BTM521
• 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-BTM521

BTM520/521
Bluetooth
AT COMMAND SET
REFERENCE
23 www.lairdtech.com
®
Multimedia Plus Module
5. SSP Timeout (S324)
6. SSP Input Commands
7. AT+BTW<bd_addr>
8. S Registers for Secure Simple Pairing
The SSP timeout [s] is defined by S-Register 324. The timeout must be at least 60s to meet the BT
specification requirements [1]. This time is required to be sufficient for the user to compare or read
and input a 6 digit number. A time of 90 seconds is recommended which is the default value.
Table 3.5 lists all AT commands related to SSP input operations.
This command initiates secure simple pairing (dedicated bonding) with a device whose Bluetooth
address is <bd_addr>. The correct term for this command’s action with respect to the Bluetooth
specification 2.1+EDR [1] is “Dedicated Bonding”.
Dedicated bonding means the exchange of link keys (pairing) without creating a connection to a
particular profile or service immediately.
The remote device must be a Bluetooth 2.1 device, otherwise (BT2.0 or earlier) legacy pairing will occur
automatically if S323=0. For legacy pairing please refer to page 25.
The “OK” response is sent immediately on receipt of the AT+BTW command. Depending on the
combination of IO-capabilities of both devices, one of the asynchronous messages from Table 3.7
might appear during the pairing process. Please refer to that table for the required actions.
On pairing completion, an unsolicited message in the form PAIR n <bd_addr> will be sent to the host.
The following table lists all S Registers for Secure Simple Pairing. For the registers’ details please refer
to their descriptions above.
AT Command
AT+BTBY
AT+BTBN
AT+BTB012345 Enter six digit passkey displayed by remote device Representing keyboard input
Register
S320
S321
S322
S323
S324
Default
2
1
0
0
90
Operation
Accept pairing request
Reject pairing request
Table 3.6: S-Registers for Secure Simple Pairing (SSP)
Range
1..3
0..4
0..1
0..1
1..255
{Initiate SSP}
Table 3.5: SSP Input commands
Comment
Security Level: see [1], vol3, Generic Access Profile - Table 5.7
needs subsequent ‘AT&W’ and power cycle to take effect
value = 3 overwrites S322
Set IO capability:
0 – display only
1 – display yes no
2 – keyboard only
3 – no input no output
4 – reject IO-cap requests
Force man-in-the-middle-protection (MITM):
0 – disabled
1 – enabled
referenced only if security level (S320) < 3
Disable legacy (pre-BT2.1) Pairing:
0 – legacy pairing enabled
1 – legacy pairing disabled
Secure Simple Pairing timeout in s
This value must be at least 60 in order to meet the recom-
mendation of BT2.1 specification
Comment
Representing ‘yes’ input
Representing ‘no’ input
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