PM0237 datasheet(24/88 Pages) STMICROELECTRONICS

24 / 88 page

Bluetooth low energy technology

PM0237

24/88

DocID027104 Rev 2

A characteristic declaration contains the value of the characteristic. This value is the first

attribute after the characteristic declaration:

1.8.2

Characteristic descriptors type

Characteristic descriptors are used to describe the characteristic value for adding a specific

“meaning” to the characteristic and making it understandable by the user. The following

characteristic descriptors are available:

Characteristic extended properties: it allows to add extended properties to the

characteristic

Characteristic user description: it enables the device to associate a text string to the

characteristic;

Client characteristic configuration: it is mandatory if the characteristic can be notified or

indicated. Client application must write this characteristic descriptor for enabling

characteristic notification or indication (provided that the characteristic property allows

notification or indication);

Server characteristic configuration: optional descriptor

Characteristic presentation format: it allows to define the characteristic value

presentation format through some fields as format, exponent, unit namespace,

description in order to correctly display the related value (example temperature

measurement value in oC format);

Characteristic aggregation format: It allows to aggregate several characteristic

presentation formats.

For a detailed description of the characteristic descriptors, refer to the Bluetooth

specification v4.0.

1.8.3

Service attribute type

A service is a collection of characteristics which operate together to provide a global service

to an applicative profile. For example, the Health Thermometer service includes

characteristics for a temperature measurement value, and a time interval between

measurements. A service or primary service can refer other services that are called

secondary services.

A service is defined as follows:

Table 13. Characteristic value

Attribute handle

Attribute type

Attribute value

Attribute permissions

0xNNNN

0xuuuu – 16 bits or 128

bits for characteristic

UUID

Characteristic value

Higher layer profile or

implementation specific

Table 14. Service declaration

Attribute handle

Attribute type

Attribute value

Attribute permissions

0xNNNN

0x2800 – UUID for

“Primary Service” or

0x2801 – UUID for

“Secondary Service”

0xuuuu – 16 bits or 128

bits for Service UUID

Read only,

No authentication,

No authorization

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