UM2071 datasheet(31/56 Pages) STMICROELECTRONICS

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UM2071

BlueNRG-1 chat master and slave demo

application

DocID029370 Rev 3

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The BLE peripheral and central roles are specified in the aci_gap_init() command.

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

commands.

8.1.2

Add service and characteristics

Refer to Section 7.1.2: " Add service and characteristics ".

8.1.3

Start discovery procedure

To find another BlueNRG-1 BLE chat master and slave device in discovery mode, a

discovery procedure must be started via:

aci_gap_start_general_discovery_proc(0x4000, 0x4000, 0x00, 0x00);

8.1.4

Enter connectable mode

The following GAP API command is used for entering general discoverable mode:

aci_gap_set_discoverable(ADV_IND, 0x90, 0x90, PUBLIC_ADDR, NO_WHITE_LIST_USE,

sizeof(local_name), local_name, 0, NULL, 0x6, 0x8);

8.1.5

Connection with chat master and slave client device

In the above mentioned discovery and mode assignment procedures, the two chat master

and slave applications assume respective client and server roles at runtime. During this

initial configuration phase, when a chat master and slave device is placed in discoverable

mode and it is found by the other chat master and slave device performing a discovery

procedure, a Bluetooth low energy connection is created and the device roles are defined.

The following GAP API command is used for connecting to the discovered device:

aci_gap_create_connection(0x4000, 0x4000,device_found_address_type,

device_found_address, PUBLIC_ADDR, 40, 40, 0, 60, 2000 , 2000);

Where device_found_address_type is the address type of the discovered chat master

and slave and device_found_address is the peer address of the discovered chat

master and slave 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 master-and-slave server device, the typed characters are sent to the

master-and-slave client device by notifying the previously added TX characteristic (after

notifications have been enabled). This is done via:

aci_gatt_update_char_value(chatServHandle, TXCharHandle, 0, len, (uint8_t *)cmd+j);

On the master-and-slave client device, the typed characters are sent to the master-and-

slave server device, by writing the previously added RX characteristic. This is done via:

aci_gatt_write_without_resp (connection_handle, rx_handle +1, len, (uint8_t

*)cmd+j);

Where connection_handle is the handle returned upon connection as a parameter of

the connection complete event, rx_handle is the RX characteristic handle discovered by

the client device.

Once these API commands have been sent, the values of the TX and RX characteristics

are displayed on the serial terminals.

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