UM1870 datasheet(36/58 Pages) STMICROELECTRONICS

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BlueNRG-MS sensor profile demo

UM1870

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Security_Permissions=0x00, GATT_Evt_Mask=0x01, Enc_Key_Size=0x07,

Is_Variable=0x01)

With this command a variable-length characteristic has been added, with read, write and

notify properties. The characteristic handle is also returned (Char_Handle).

5.3.3

Set security requirements

BlueNRG-MS exposes a command that the application can use to specify its security

requirements. If a characteristic has security restrictions, a pairing procedure must be

initiated by the central in order to access that characteristic. Let's assume we want the user

to insert a passcode during the pairing procedure.

–

ACI_GAP_SET_AUTH_REQUIREMENT(MITM_Mode=0x01, OOB_Enable=0,

OOB_Data=0, Min_Encryption_Key_Size=7, Max_Encryption_Key_Size=16,

Use_Fixed_Pin=0, Fixed_Pin=123456, Bonding_Mode=1)

5.3.4

Enter connectable mode

Use GAP ACI commands to enter one of the discoverable and connectable modes.

–

ACI_GAP_SET_DISCOVERABLE(Advertising_Type=0x00,

Advertising_Interval_Min=0x800, Advertising_Interval_Max=0x900,

Own_Address_Type=0x00, Advertising_Filter_Policy=0x00,

Local_Name_Length=0x08, Local_Name='\x08BlueNRG',

Service_UUID_Length=0x00, Service_UUID_List=0x00,

Slave_Connection_Interval_Min=0x0000,

Slave_Connection_Interval_Max=0x0000)

The Local_Name parameter contains the name that will be present in advertising data, as

described in Bluetooth core specification version 4.1, Vol. 3, Part C, Ch. 11(d).

5.3.5

Connection with central device

Once BlueNRG-MS is put in a discoverable mode, it can be seen by a central device in

scanning.

Any Bluetooth smart and smart-ready device can connect to BlueNRG-MS, such as a

smartphone. LightBlue is one of the applications in the Apple store for iPhone® 4S/5 and

later versions of Apple’s iPhone.

Start the LightBlue application. It will start to scan for peripherals. A device with the

BlueNRG-MS name will appear on the screen. Tap on the box to connect to the device. A

list of all the available services will be shown on the screen. Touching a service will show the

characteristics for that service.

BlueNRG-MS has added two standard services: GATT Service (0x1801) and GAP service

(0x1800).

Try to read the characteristic from the service just added (0xA001). The characteristic has a

variable length attribute, so you will not see any value. Write a string into the characteristic

and read it back.

The first byte of the value is the AD Type. In BlueNRG-MS GUI the \xHH notation is used to specify a byte in

hexadecimal format inside a string.

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