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General Attributes table (GATT)
iBKS-USB
Beacon Service
UUID:0000fff0-0000-1000-8000-00805f9b34fb
Length
Characteristic
Type
Comments
Default Value
UUID
16 bytes
0xFFF1
Read/write
iBeacon Protocol
0x0...00
Major
2 bytes
0xFFF2
Read/write
iBeacon Protocol
0x0001
Minor
2 byte
0xFFF3
Read/write
iBeacon Protocol
0x0001
CPwr
1 byte
0xFFF4
Read/write
iBeacon Protocol
0xC6
2 bytes
0xFFF5
Read/write
Value in ms
0x03B6
Tx Power
1 byte
0xFFF6
Read/write
Possible values: 00/01/02/03
0x07
Password
2 bytes
0xFFF7
Read/write
2 bytes number
0x0000
Config byte
1 byte
0xFFF8
Read/write
Possible values: 1A/1B/9A/9B/FF
0x1A
State byte
1 byte
0xFFF9
Read Only
Possible values: 00/01/02
0x01
Adv. Interval
Characteristics meaning
The first ten seconds after power up the iBKS-USB is a connectable device ready to receive the configuration, this period is
called “connectable time window” (CTW) and the iBKS-USB is seen by central devices as a custom profile BLE device.
If the password is set to 0x0000 (default value) the config app can connect to the iBKS-USB, it is possible to read and write the
values of different characteristics.
If there are a password set inside the device(different of 0x0000, 2 bytes) the device is connectable always in the CTW period
but you can not read or write any characteristic except password, in this mode, the password characteristic is to write the correct
password to unblock “CONFIG MODE”. The state characteristic will show the number “0” when the password is not introduced,
“1” when the password is introduced correctly and “2” if the maximum password times wrong has been overcome. When the
state characteristic byte shows the value '1' the password characteristic acts as password changer, remember this password, you
will need it next time that you want to connect with iBKS-USB.
iBeacon Service
UUID: Normally used to define all the beacons that will be used in the same APP. For example all the devices to be used in the
“Example Shopping Mall” APP should have the same UUID value.
Major: Used to define a group of beacons into an UUID group. For example, all the beacons in the “Example Store 1” in the
“Example Shopping Mall” should have the same Major. In this case, every shop should has its own major group value.
Minor: Used as lowest level identifier into the Major group of the global UUID group.
CPwr: Used to set the Power received in db at 1m. This will be used to define distance range for the app (near, medium, far).
Insert the ‘dB’ received at 1m in Hexadecimal.
Adv.Int: Defines time between advertising packets (period). Introduce directly the number of miliseconds desired.
Tx Power: Introduce one of the possible values:
-”0” to set “-23 dB”
-”1” to set “-6 dB”
-”2” to set “0 dB”
-”3” to set “+4 dB”
Password: Set 2 bytes password to protect the beacon against undesired entries. Introduce the same password to enter in
configuration mode.
Config. Byte: This value defines:
First Digit: 1
Second Digit: if send iBeacon(A) standard packet or an extra byte to report the battery level(B).