PM0237 datasheet(19/88 Pages) STMICROELECTRONICS

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PM0237

Bluetooth low energy technology

Attribute example

•

“Temperature UUID” is defined by “Temperature characteristic” specification and it is

a signed 16-bit integer.

A collection of attributes is called a database that is always contained in an attribute server.

Attribute protocol defines a set of methods protocol for discovering, reading and writing

attributes on a peer device. It implements the peer-to-peer Client-Server protocol between

an attribute server and an attribute client as follows:

•

Server role

–

Contains all attributes (attribute database)

–

Receives requests, executes, responds commands

–

Can indicate, notify an attribute value when data change

•

Client role

–

Talk with server

–

Sends requests, wait for response (it can access (read), update (write) the data)

–

Can confirm indications

Attributes exposed by a Server can be discovered, read, and written by the Client, and they

can be indicated and notified by the Server as described in Table 9:

Table 8. Attribute example

Attribute handle

Attribute type

Attribute value

Attribute permissions

0x0008

“Temperature UUID”

“Temperature Value”

“Read Only, No

authorization, No

authentication”

Table 9. Attributes protocol messages

Protocol Data Unit

(PDU message)

Sent by

Description

Request

Client

Client requests something from server (it

always causes a response)

Response

Server

Server sends response to a request from a

client

Command

Client

Client commands something to server (no

response)

Notification

Server

Server notifies client of new value (no

confirmation)

Indication

Server

Server indicates to client new value (it always

causes a confirmation)

Confirmation

Client

Confirmation to an indication

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