Datasheet

Page 83 of 161

nRF8001 Product Specification

Revision 1.2

Setup of GATT services involves configuration of the following:

• Local Services (Server), relevant remote services (Client)

• Applicable service pipes

22.3.2.1 UUID configuration and format

All services and characteristics are identified by a 128 bit Universally Unique Identifier (UUID). Service and

Characteristic UUIDs are either defined by the

Bluetooth SIG or you may define your own.

The UUID’s associated with the adopted

Bluetooth services are listed in the Assigned Numbers document.

This document can be downloaded from the

Bluetooth SIG website: https://www.bluetooth.org/Technical/

AssignedNumbers/service_discovery.htm. The format of the Bluetooth SIG UUIDs is illustrated in Figure

47.

Figure 47. Bluetooth UUID format and organisation (Big Endian format)

The characters represented by bytes 13 and 14 are the short form UUID (16 bits rather than the full 128 bit

version) which is used to identify the various

Bluetooth services and characteristics.

If your application requires proprietary services or characteristics, it will use UUIDs that are outside the

Bluetooth UUID address space.

It is your responsibility to ensure that any proprietary UUIDs you have defined are unique. Visit the

International Telecommunication Union (ITU) website for details on the procedure for how to register your

own UUIDs: http://www.itu.int/ITU-T/asn1/uuid.html

nRF8001 supports storage of 5 vendor specific 128-bit base UUID that you can specify to any value. Each

of the 5 base UUIDs can be further expanded to 65536 UUIDs by changing the 16 bits of the short form

UUID, see Figure 48.

Figure 48. nRF8001 UUID format and organization



0000 0000 – 0000 – 1000 – 8000 – 00805F9B34FB

Bluetooth UUID base address

Short UUID form (16 bit)

0000 XXXX – 0000 – 1000 – 8000 – 00805F9B34FB



0000 – 0000 – 1000 – 8000 – 001122334455

Proprietary UUID base address

(example)

Short UUID form (16 bit) can be

used to generate multiple

addresses from the base address

0000

0001

0002

...

FFFF

0000 – 0000 – 1000 – 8000 – 001122334455