BTM410/411
Bluetooth
®
AT Data Module
27
www.lairdtech.com
Laird Technologies
AT COMMAND SET
REFERENCE
4.
AT+BTD* {Remove All Trusted Devices}
This command is used to remove all devices from the trusted device list (TDL) in the non-volatile
database. No confirmation will be asked for. So beware!!!
WARNING: If you make a connection, the link key gets cached in the underlying stack. So if you
subsequently delete the key using AT+BTD* and immediately request a connection to the same
device, then the connection will be established. To ensure this does not happen, send ATZ after the
AT+BTD*.
Response:
<cr,lf>OK<cr,lf>
5.
AT+BTW? {List Cached Trusted Device}
This command is used to list the cached trusted device.
Response:
<cr,lf>12346789012
<cr,lf>OK<cr,lf>
If the cache is empty the response is as follows.
Response:
<cr,lf>OK<cr,lf>
AT Commands for Serial Stream Oriented Profiles (SSO)
The Serial Port Profile (SSP) and the Dial-up Networking Profile (DUN) belong to the group of Serial
Stream Oriented profiles (SSO).
When activated, an SSO profile claims one UART for its data stream and assumes all data at the UART to
be transmitted over or received from RF 1:1. Hence, as there is only one UART available on a BTM
device, the UART is not available for other profiles, services or module control purposes.
One approach of managing data and control over UART is to configure local command mode with
S531=3. In this mode, incoming RF data is presented by the asynchronous message RX<string>. Outgoing
data is sent by ATX<string> or ATY<string>.
With this approach it is possible to manage several non-SSO connections (e.g. A2DP, AVRCP) and at
maximum one SSO connection (SSP or DUN). An attempt to connect a second SSO profile while already
one SSO connected will result in Error 65.
Any incoming connection request to an SSO profile will be rejected if one SSO is already connected.
The following section describes AT- commands related to SSO-profiles
1.
ATX”<string>” {Send Data in Local Command and Connected Mode}
This command is used to send data to the remote device when in local command and connected
mode.
The parameter <string> is any string not more than 29 characters long whereby a non printable
character (\hh, see below) counts 3 characters. This restriction results from the maximum AT
command length which is 34 (query by ATI15). The difference of 5 is caused by “ATX” (3 characters)
and the enclosing quotation marks (2 characters).
Summary of Contents for BTM410
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