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BlueNRG-MS chat demo application

UM1870

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DocID027602 Rev 1

initiated by the central in order to access that characteristic. On BLE chat demo, a fixed pin

(123456) is used as follows:

aci_gap_set_auth_requirement(MITM_PROTECTION_REQUIRED,OOB_AUTH_DATA_AB

SENT,NULL,7,16, USE_FIXED_PIN_FOR_PAIRING,123456,BONDING);

6.2.4

Enter connectable mode

On BLE chat, server role device uses GAP ACI commands to enter into 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 that will be present in advertising data, as

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

6.2.5

Connection with central device

Once the BLE chat, server role device is put in a discoverable mode, it can be seen by the

BLE chat, client role device in order to create a Bluetooth low energy connection.

On BLE chat, client role device uses GAP ACI commands to connect with the BLE chat,

server role device in advertising mode:

aci_gap_create_connection(0x4000, 0x4000, PUBLIC_ADDR, bdaddr, PUBLIC_ADDR, 9,

9, 0, 60, 1000, 1000);

where bdaddr is the peer address of the BLE chat, client role device.

Once the 2 devices are connected, the user can set up a serial terminal and type into each

of them. The typed characters will be respectively stored in 2 buffers and upon pressing the

keyboard return key, BLE communication will work as follows:

On BLE chat, server role device, the typed characters will be sent to BLE chat, client

role device by notifying the TX characteristic that has been previously added (after

notifications have been enabled). This can be done using the following command:

aci_gatt_update_char_value(chatServHandle,TXCharHandle,0,len,(tHalUint8 *)cmd+j)

On BLE chat, client role device, the typed characters will be sent to the BLE chat,

server role device, by writing the RX characteristic that has been previously added.

This can be done using the following command:

aci_gatt_write_without_response(connection_handle, RX_HANDLE+1, len, (tHalUint8

*)cmd+j)

Where connection_handle is the handle returned on connection creation as a

parameter of the EVT_LE_CONN_COMPLETE event.

Once these ACI commands have been sent, the values of the TX, RX characteristics are

displayed on the serial terminals.

UM1870 датащи(PDF) 42 Page - STMicroelectronics