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UM1870

BlueNRG-MS sensor profile demo

Figure 14. BlueNRG-MS app

5.3

BlueNRG-MS sensor profile demo: connection with a central

device

This section describes how to interact with a central device, while BlueNRG-MS is acting as

a peripheral. The central device can be another BlueNRG-MS acting as a master, or any

other Bluetooth smart or smart-ready device.

First, BlueNRG-MS must be set up. In order to do this, a series of ACI command need to be

sent to the processor.

5.3.1

Initialization

BlueNRG-MS’s stack must be correctly initialized before establishing a connection with

another Bluetooth LE device. This is done with two commands:

–

ACI_GATT_INIT

–

ACI_GAP_INIT(Role=0x01)

See ACI documentation for more information on these commands and on those that follow

as well. Peripheral role must be specified inside the GAP_INIT command.

5.3.2

Add service and characteristics

BlueNRG-MS’s Bluetooth LE stack has both server and client capabilities. A characteristic is

an element in the server database where data are exposed. A service contains one or more

characteristics. Add a service using the following command. Parameters are provided only

as an example.

–

ACI_GATT_ADD_SERVICE(Service_UUID_Type=0x01,

Service_UUID_16=0xA001, Service_Type=0x01, Max_Attributes_Records=0x06)

The command will return the service handle (e.g., 0x000C). A characteristic must now be

added to this service. This service is identified by the service handle.

–

ACI_GATT_ADD_CHAR(Service_Handle=0x00C, Char_UUID_Type=0x01,

Char_UUID_16=0xA002, Char_Value_Length=10, Char_Properties=0x1A,

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