UM2071 datasheet(36/56 Pages) STMICROELECTRONICS

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BlueNRG-1 sensor profile demo

UM2071

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DocID029370 Rev 3

10.2.2

Add service and characteristics

The BlueNRG-1 BLE stack has both server and client capabilities. A characteristic is an

element in the server database where data is exposed, while a service contains one or

more characteristics. The acceleration service is added with the following command:

aci_gatt_add_service(UUID_TYPE_128,

&service_uuid, PRIMARY_SERVICE, 7,

&accServHandle);

The command returns the service handle on variable accServHandle. The free fall and

acceleration characteristics must now be added to this service thus:

aci_gatt_add_char(accServHandle, UUID_TYPE_128, &char_uuid, 1, CHAR_PROP_NOTIFY,

ATTR_PERMISSION_NONE, 16, 0, &freeFallCharHandle);

aci_gatt_add_char(accServHandle, UUID_TYPE_128, &char_uuid, 6,

CHAR_PROP_NOTIFY|CHAR_PROP_READ, ATTR_PERMISSION_NONE,

GATT_NOTIFY_READ_REQ_AND_WAIT_FOR_APPL_RESP, 16, 0, &accCharHandle);

The free fall and acceleration characteristics handles are returned on

freeFallCharHandle and accCharHandle variables respectively.

Similar steps are followed for adding the environmental sensor and relative characteristics.

10.2.3

Enter connectable mode

Use GAP API command to enter one of the discoverable and connectable modes:

aci_gap_set_discoverable(ADV_IND, (ADV_INTERVAL_MIN_MS*1000)/625,

(ADV_INTERVAL_MAX_MS*1000)/625, STATIC_RANDOM_ADDR, NO_WHITE_LIST_USE

sizeof(local_name), local_name, 0, NULL, 0, 0);

Where

local_name[] = {AD_TYPE_COMPLETE_LOCAL_NAME,'B','l','u','e','N','R','G'};

The local_name parameter contains the name presented in advertising data, as per

Bluetooth core specification version 4.1, Vol. 3, Part C, Ch. 11.

10.2.4

Connection with central device

Once the BlueNRG-1 BLE stack is placed in discoverable mode, it can be detected by a

central device. The smartphone app described in Section 10.1: " BlueNRG app for

smartphones " is designed for interact with the sensor profile demos (it also supports the

BlueNRG-1 device).

Any Bluetooth smart or Bluetooth smart ready device like a smartphone can connect to the

BlueNRG-1 BLE sensor profile demo.

For example, the LightBlue application in Apple Store® connects iPhone® versions 4S/5

and above can connect to the BlueNRG-1 sensor profile device. When you use the

LightBlue application, detected devices appear on the screen with the BlueNRG name. By

tapping on the box to connect to the device, a list of all the available services is shown on

the screen; tapping a service shows the characteristics for that service.

The acceleration characteristic can be notified using the following command:

aci_gatt_update_char_value(accServHandle, accCharHandle, 0, 6, buff);

Where buff is a variable containing the three axes acceleration values.

Once this API command has been sent, the new value of the characteristic is displayed on

the phone.

UM2071 Datasheet(PDF) 36 Page - STMicroelectronics

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