Getting started

AN4127

14/27

Doc ID 023304 Rev 1

Figure 20.

BDAddress dongle1, dongle2

From now on the user can operate the dongle using the AT commands.

6.2.2

Inquiry and available services

Before establishing a connection, the dongle must know which Bluetooth devices are

present and which services are offered. Each module has its own address which identifies

the module itself in the network. The BD address can be found during the discovery phase.

If the BD address of the Bluetooth device the user wants to connect to is known, the inquiry

procedure can be omitted.

●

Discovery:

–

AT+AB discovery

This command returns the number of responses of nearby devices and then the individual

responses with the BD address, and device name. The number of devices returned is

limited to 10.

Inquiry is performed with an interval of 10.24 seconds.

The devices are reported in the same order as the original inquiry results.

For each name or service name request that is successful, the response uses the returned

names in the following format:

–

AT-AB device [BD addr] [name]

–

AT-AB device [BD addr] Unknown

As a consequence of a discovery command issued by dongle1, the following lines are

displayed: