UM2071 datasheet(28/56 Pages) STMICROELECTRONICS

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BlueNRG-1 chat demo application

UM2071

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aci_gap_init(GAP_CENTRAL_ROLE, 0, 0x08, &service_handle, &dev_name_char_handle,

&appearance_char_handle);

Peripheral and central BLE roles must be specified in the aci_gap_init() command.

See the BlueNRG-1 BLE stack API documentation for more information on these and

following commands.

7.1.2

Add service and characteristics

The chat service is added to the BLE chat server device via:

aci_gatt_add_service(UUID_TYPE_128, &service_uuid, PRIMARY_SERVICE,

7,&chatServHandle);

Where service_uuid is the private service 128-bit UUID allocated for the chat service

(Primary service). The command returns the service handle in chatServHandle. The TX

characteristic is added using the following command on the BLE Chat server device:

aci_gatt_add_char(chatServHandle, UUID_TYPE_128, &charUuidTX, 20, CHAR_PROP_NOTIFY,

ATTR_PERMISSION_NONE, 0, 16, 1, &TXCharHandle);

Where charUuidTX is the private characteristic 128-bit UUID allocated for the TX

characteristic (notify property). The characteristic handle is returned on the

TXCharHandle variable.

The RX characteristic is added using the following command on the BLE Chat server

device:

aci_gatt_add_char(chatServHandle, UUID_TYPE_128, &charUuidRX, 20,

CHAR_PROP_WRITE|CHAR_PROP_WRITE_WITHOUT_RESP, ATTR_PERMISSION_NONE,

GATT_SERVER_ATTR_WRITE,16, 1, &RXCharHandle);

Where charUuidRX is the private characteristic 128-bit UUID allocated for the RX

characteristic (write property). The characteristic handle is returned on the RXCharHandle

variable.

See the BlueNRG-1 BLE stack API documentation for more information on these and

following commands.

7.1.3

Enter connectable mode

The server device uses GAP API commands to enter the general discoverable mode:

aci_gap_set_discoverable(ADV_IND, 0, 0, PUBLIC_ADDR, NO_WHITE_LIST_USE,8,local_name,

0, NULL, 0, 0);

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

Bluetooth core specification version 4.2, Vol. 3, Part C, Ch. 11.

7.1.4

Connection with central device

Once the server device is discoverable by the BLE chat client device, the client device uses

aci_gap_create_connection()to connect with the BLE chat server device:

aci_gap_create_connection(0x4000, 0x4000, PUBLIC_ADDR, bdaddr, PUBLIC_ADDR, 40, 40,

0, 60, 2000 , 2000);

Where bdaddr is the peer address of the client device.

Once the two devices are connected, you can set up corresponding serial terminals and

type messages in either of them. The typed characters are stored in two respective buffers

and when the return key is pressed:



on the BLE chat server device, the typed characters are sent to the BLE chat client

device by notifying the previously added TX characteristic (after notifications are

enabled) with:

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