PM0237 datasheet(76/88 Pages) STMICROELECTRONICS

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Design an application using BlueNRG, BlueNRG-MS ACI APIs

PM0237

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pr->handle_value_pair_length: 0x15 length of each discovered

characteristic data: characteristic handle, properties, characteristic

value handle, characteristic UUID;

pr->handle_value_pair: 0x15 bytes as follows:

In the context of the Sensor Profile Demo, when the discovery all characteristics of a

service procedure completes, the EVT_BLUE_GATT_PROCEDURE_COMPLETE is generated on

GAP Central application, with following evt_gatt_procedure_complete data:

pr->conn_handle : 0x0801 (connection handle);

pr-> data_length: 0x01 (length of the event data);

pr->data[]: 0x00 (event data).

Similar steps can be followed in order to discover all the characteristics of the environment

service (refer to Table 41: BlueNRG sensor profile demo services & characteristics handles)

and Table 42: BlueNRG-MS sensor profile demo services & characteristics handles).

3.7

Characteristic notification/indications, write, read

This section describes the main functions for getting access to BLE device characteristics.

Table 49. Second evt_att_read_by_type_resp event data

Characteristic

handle

Characteristic

properties

Characteristic

value handle

Characteristic UUID

Note

0x0014

(BlueNRG),

0x0010

(BlueNRG-MS)

0x12 (notify and

read)

0x0015

(BlueNRG),

0x0011

(BlueNRG-MS)

0x340A1B80CF4B11E1AC360002A5D

5C51B

Acceleration

characteristic

128bits

characteristic

proprietary

UUID

Table 50. Characteristics update, read, write APIs

Discovery service API

Description

Where

aci_gatt_update_char_value()

If notifications (or indications) are enabled

on the characteristic, this API sends a

notification (or indication) to the client.

GATT server

aci_gatt_read_charac_val()

It starts the procedure to read the attribute

value.

GATT client

aci_gatt_write_charac_value()

It starts the procedure to write the attribute

value (when the procedure is completed, a

EVT_BLUE_GATT_PROCEDURE_COMP

LETE event is generated).

GATT client

aci_gatt_write_without_response()

It starts the procedure to write a

characteristic value without waiting for any

response from the server.

GATT client

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