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BlueNRG-MS chat demo application

UM1870

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BlueNRG-MS chat demo application

The software development kit contains another example, which implements a simple 2-way

communication between two BlueNRG-MS devices. It shows a simple point-to-point

wireless communication using the BlueNRG-MS product.

This demo application exposes one service: chat service.

The chat service contains 2 characteristics:

•

The TX characteristic: the client can enable notifications on this characteristic. When

the server has data to be sent, it will send notifications which will contain the value of

the TX characteristic.

•

The RX characteristic: this is a writable characteristic. When the client has data to be

sent to the server, it will write a value into this characteristic.

•

The maximum length of the characteristic value is 20 bytes.

There are 2 device roles which can be selected through the specific EWARM workspace:

–

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

–

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

The application requires 2 devices to be programmed respectively with the 2 devices roles:

server and client. The user must connect the 2 devices to a PC through USB and open a

serial terminal on both, with the following configurations:

Figure 15. Serial port configuration

The application will listen for keys typed into one device and upon pressing the keyboard

return key, it will send them to the remote device. The remote device will listen for RF

messages and will output them in the serial port. In other words, anything typed in one

device will be visible to the other device.

6.1

Supported platforms

The BlueNRG-MS chat demo (server & client roles) is supported on the BlueNRG-MS

development platform (STEVAL_IDB005V1).

6.2

BlueNRG-MS chat demo application: peripheral & central

devices

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

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

UM1870 Fiches technique(PDF) 40 Page - STMicroelectronics