UM2071 datasheet(27/56 Pages) STMICROELECTRONICS

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UM2071

BlueNRG-1 chat demo application

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BlueNRG-1 chat demo application

The BlueNRG-1 chat demo (server and client roles) is supported on the BlueNRG-1

development platform (STEVAL-IDB007V1). It implements simple two-way communication

between two BlueNRG-1 devices, demonstrating point-to-point wireless communication

using the BlueNRG-1 product.

This demo application exposes a single chat service with the following (20 byte max.)

characteristic values:



The TX characteristic, with which the client can enable notifications; when the server

has data to be sent, it sends notifications with the value of the TX characteristic.



The RX characteristic, is a writable characteristic; when the client has data to be sent

to the server, it writes a value in this characteristic.

There are two device roles which can be selected through the specific project workspace:



The Server that exposes the chat service (BLE peripheral device).



The Client that uses the chat service (BLE central device).

The application requires two devices to be programmed with respective server and client

roles. These must be connected to a PC via USB with an open serial terminal for each

device, with the following configurations:

Table 6: Serial port configuration

Parameter

value

Baudrate

115200 bit/s

Data bits

Parity bits

None

Stop bits

The application listens for keys typed in one device terminal and sends them to the remote

device when the return key is pressed; the remote device then outputs the received RF

messages to the serial port. Therefore, anything typed in one terminal becomes visible in

the other.

7.1

Peripheral and central device setup

This section describes how two BLE chat devices (server-peripheral and client-central)

interact with each other in order to set up a point-to-point wireless chat.

BlueNRG-1 must first be set up on both devices by sending a series of API commands to

the processor.

7.1.1

Initialization

The BlueNRG-1 BLE stack must be correctly initialized before establishing a connection

with another BLE device. This is done with aci_gatt_init() and aci_gap_init()

APIs:

aci_gatt_init();

BLE Chat server role:

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

&appearance_char_handle);

BLE Chat client role:

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