User's Manual

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Laird Technologies

BTM510/511

Bluetooth

Multimedia Module

2.2 ATA {Accept Incoming SPP Connection Request}

Accept an incoming connection, which is indicated by the unsolicited string <cr,lf>RING

123456789012<cr,lf> every second. 123456789012 is the Bluetooth address of the

connecting device.

Response: <cr,lf>CONNECT 123456789012,1101,<<cr,lf>

2.3 AT+SPD<bd_addr> {Make Outgoing SPP Connection}

Initiate an SPP connection to device with Bluetooth address <bd_addr> and SPP prole.

The timeout is specied by S register 505.

For backward compatibility, the following command fulls the same purpose: ATD<bd_addr>.

Response: <cr,lf>CONNECT 123456789012,1101,><cr,lf>

Or <cr,lf>NO CARRIER<cr,lf>

Due to a known issue in the Bluetooth RFCOMM stack, it is not possible to make more than

65525 outgoing connections in a single power up session. Therefore if that number is exceeded,

then the connection attempt will fail with the following response:

Response: <cr,lf>CALL LIMIT

Or <cr,lf>NO CARRIER<cr,lf>

In that case, issuing an ATZ to reset the device will reset the count to 0 and more connections

are possible.

Figure 3.4: SPP example Device A - initiate connection, receiving data, command mode, disconnect

Figure 3.5: SPP example Device B - incoming connection, receiving data, disconnection

AT COMMAND SET

REFERENCE