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BlueNRG-1 chat master and slave demo

application

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DocID029370 Rev 3

BlueNRG-1 chat master and slave demo application

The BlueNRG-1 chat master and slave demo is supported on the BlueNRG-1 development

platform (STEVAL-IDB007V1). It demonstrates simple point-to-point wireless

communication using a single application which configures the chat client and server roles

at runtime.

The new chat demo application configures a BlueNRG-1 BLE device as central or

peripheral using the API:

aci_gap_init(GAP_CENTRAL_ROLE|GAP_PERIPHERAL_ROLE, 0, 0x07, &service_handle,

&dev_name_char_handle, &appearance_char_handle);

It then initiates a discovery procedure for another BlueNRG-1 BLE device configured with

the same chat master and slave application image.

If such a device is found within a random interval, it starts a connection procedure and

waits until a connection is established. If the discovery procedure time expires without

finding another chat master and slave device, the device enters discovery mode and waits

for another chat master and slave device to discover and connect to it.

When connection is established, the client and server roles are defined and the chat

communication channel can be used.

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.

The application requires two devices to be programmed with the same application, with the

server and client roles defined at runtime. Connect the two devices to a PC via USB and

open a serial terminal on both with the same configuration as Table 6: "Serial port

configuration".

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.

8.1

BlueNRG-1 chat master and slave roles

This section describes how two BLE chat master and slave devices interact with each other

in order to set up a point-to-point wireless chat.

The BlueNRG-1 BLE stack must first be set up on both devices by sending a series of API

commands to the processor. The chat master and slave client and server roles are defined

at runtime.

8.1.1

Initialization

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

with another BLE device. This is done with two commands:

aci_gatt_init();

aci_gap_init(GAP_CENTRAL_ROLE|GAP_PERIPHERAL_ROLE, TRUE,0x07, &service_handle,

&dev_name_char_handle, &appearance_char_handle);

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