PM0237 datasheet(15/88 Pages) STMICROELECTRONICS

15 / 88 page

DocID027104 Rev 2

15/88

PM0237

Bluetooth low energy technology

1.3.2

Advertising state

Advertising states allow Link Layer to transmit advertising packets and also to respond with

scan responses to scan requests coming from devices which are actively scanning.

An advertiser device can be moved to a standby state by stopping the advertising.

Each time a device advertises, it sends the same packet on each of the three advertising

channels. This three packets sequence is called an advertising event. The time between two

advertising events is referred to as the advertising interval, which can go from 20

milliseconds to every 10.28 seconds.

Following is an example of advertising packet that lists the Service UUID that the device

implements (General Discoverable flag, tx power = 4dbm, Service data = temperature

service and 16 bits service UUIDs).

Figure 5. Advertising packet with AD type flags

The Flags AD type byte contains the following flag bits:

•

Limited Discoverable Mode (bit 0);

•

General Discoverable Mode (bit 1);

•

BR/EDR Not Supported (bit 2, It is 1 on BLE);

•

Simultaneous LE and BR/EDR to Same Device Capable (Controller) (bit 3);

•

Simultaneous LE and BR/EDR to Same Device Capable (Host) (bit 4)

The Flags AD type shall be included in the advertising data if any of the bits are non-zero (it

is not included in scan response).

The following advertising parameters can be set before enabling advertising:

•

Advertising interval;

•

Advertising address type;

•

Advertising device address;

•

Advertising channel map: which of the three advertising channels should be used;

•

Advertising filter policy:

–

Process scan/connection requests from devices in the white list

–

Process all scan/connection requests (default advertiser filter policy)

–

Process connection requests from all devices but only scan requests in the white

list

–

Process scan requests from all devices but only connection requests in the white

list

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