BTM410/411
Bluetooth
®
AT Data Module
24
www.lairdtech.com
Laird Technologies
AT COMMAND SET
REFERENCE
AT COMMAND SET
REFERENCE
9.
Asynchronous SSP Messages
Table 3-14 lists asynchronous messages which occur if MITM is enabled. The actually sent message
depends on the combination of the IO capabilities of both ends. The combination of IO capabilities
of both devices can also be insufficient for MITM protection. In that case the pairing will fail (PAIR 2
<BdAddr>). Please refer Table 5.6 in BT2.1+EDR specification [1], vol3, Generic Access Profile for
sufficient combinations of IO-capabilities for MITM (=authenticated link key).
Table 3-14: Asynchronous messages for SSP
Message
Action / Comment
PAIR ?
<BdAddr>,”<friendlyname>”,<Passkey>
Example:
PAIR ? 0016A4000002,”Laird BTM
000002”,863611
Passkey compare request:
Expecting the user to compare the passkey
displayed on both ends and to confirm a match by
“AT+BTBY” at both ends or reject by “AT+BTBN”
if passkey does not match
PASSKEY ? <BdAddr>,”<friendlyname>”
Example:
PASSKEY ? 0016A4000001,”Laird BTM
000001”
Passkey request:
Expecting the user to enter the passkey
displayed by the remote device.
Use AT+BTB<passkey>,
example: AT+BTB012345 *see(1) below
PAIR N
<BdAddr>,”<friendlyname>”,<Passkey>
Example:
PASSKEY N 0016A4000002,”Laird BTM
000002”,164585
Passkey notification:
Display BdAddr, friendly name and passkey to
user;
Expecting the user to enter the passkey from this
message at the remote device’s numeric
keyboard.
PAIR 0 <BdAddr> <nn>
Successfully paired with device of <BdAddr>.
<nn> (optional) indicates the status of automatic
storage to trusted device list. Value 0 = success;
Settings controlled by S325 to S328. Please refer
to section 2.3, page 37
PAIR 1 <BdAddr>
Pairing timeout
PAIR 2 <BdAddr>
Pairing failed
PAIR 3 <BdAddr>
Pairing failed (too many repeat attempts)
PAIR 4 <BdAddr>
Pairing rejected by remote device
PAIR 5 <BdAddr>
Pairing failed (unit keys not supported)
PAIR 6 <BdAddr>
Pairing failed (SSP not supported)
PAIR 7 <BdAddr>
Pairing failed (already busy with pairing)
(1) If both devices have a “KeyboardOnly” capability, no pass key can be displayed. In that
case, the user is required to invent and enter the identical 6 digit numeric passkey at both
ends.
Summary of Contents for BTM410
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