PM0237 datasheet(14/88 Pages) STMICROELECTRONICS

14 / 88 page

Bluetooth low energy technology

PM0237

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DocID027104 Rev 2

The advertising event type determines the allowable responses:

Data packet header:

The next sequence number (NESN) bit is used for performing packet acknowledgments. It

informs the receiver device of the next sequence number that the transmitting device is

expecting it to send. Packet is retransmitted until the NESN is different from the sequence

number (SN) value in the sent packet.

More data bit is used to signal to a device that the transmitting device has more data ready

to be sent during the current connection event.

For a detailed description of advertising and data header contents & types refer to the

Bluetooth specification v4.0 [Vol 2], on Section 4: References.

•

Length: number of bytes on data field

•

Data or payload: it is the actual transmitted data (advertising data, scan response data,

connection establishment data, or application data sent during the connection).

•

CRC (24 bits): it is used to protect data against bit errors. It is calculated over the

header, length and data fields.

Table 4. Advertising event type and allowable responses

Advertising event type

Allowable response

SCAN_REQ

CONNECT_REQ

ADV_IND

YES

ADV_DIRECT_IND

YES

ADV_NONCONN_IND

ADV_SCAN_IND

YES

Table 5. Data packet header content

Link layer

identifier

Next sequence

number

Sequence

number

More data

Reserved

(2 bits)

(1 bit)

(3 bits)

Table 6. Packet length field and valid values

Length field bits

Advertising packet

6 bits, with valid values from 0 to 37 bytes

Data packet

5 bits, with valid values from 0 to 31 bytes

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