BTM410/411
Bluetooth
®
AT Data Module
41
www.lairdtech.com
Laird Technologies
AT COMMAND SET
REFERENCE
AT COMMAND SET
REFERENCE
1.1
SCO / eSCO Asynchronous Messages
The following asynchronous messages apply to SCO/eSCO connections
AUDIO ON (SCO)
This response is sent to the host when a SCO channel has been established.
AUDIO ON (eSCO)
This response is sent to the host when a eSCO channel has been established.
AUDIO OFF
This response is sent to the host when an existing SCO/eSCO channel has been closed.
AUDIO FAIL
This response is sent to the host when a SCO channel setup fails. This might be caused by the fact
that the peer only accepts eSCO connections but a SCO connection was requested or vice versa.
Please try to initiate the SCO connection with the remaining link type.
2.
Link Key Management
On a BTM device, link keys are managed by the AT firmware. Appropriate AT commands are
described on page 23. There is a range of S Registers defining the behavior of automatic link key
storage on incoming/outgoing and dedicated/general bonding.
2.1
Dedicated Bonding
In BT2.1 specification, “dedicated bonding” is defined as the exchange of link keys between two
devices without the intention of establishing a connection immediately.
Dedicated bonding is initiated by “AT+BTW<BdAddr>” (initiation of pairing).
2.2 General Bonding
In BT2.1 specification, “general bonding” is defined as the exchange of link keys between two
devices with the intention of establishing a connection immediately. This is the case if a device tries
to connect to another device without existing link key. Hence, pairing (authentication and exchange
of link keys) is initiated automatically prior to the connection.
General bonding is initiated by a connection requesting AT command if there is no link key for the
peer device existing. Such AT commands are:
“AT+SPD<BdAddr>”, “AT+APD<BdAddr>”, “AT+AVD<BdAddr>”, ”AT+HSD<BdAddr>”,
“AT+HSGD<BdAddr>”, “AT+HFD<BdAddr>”, “AT+HFGD<BdAddr>”, “AT+DUD<BdAddr>”
Содержание BTM410
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