Decoding iBeacon message

Hi,

it's very simple and you already got most of it down. First 3 bytes are not related to iBeacon, they are just the advertising flags.

02 - length of this chunk

01 - type of data (GAP_ADTYPE_FLAGS)

1A - this is the flag byte containing info about the apple device. it can be different, e.g. for my CC2541 based peripheral it's 06.

Now starts the iBeacon part:

1A - length (26 bytes)

FF - type of data (i.e. manufacturer-specific data)

4C, 00 - this is Apple's 16 bit company identifier

02 - presumably signals that iBeacon data follows

15 - length of data that follows (21 bytes)

next 16 bytes: the UUID of the iBeacon

00 42 - major number

00 58 - minor number

C5 - int8 value (2's complement) of the transmit power in dB

Hope that helped.

Hello,

How can we create a OAD firmware for CC2541 that will enable the device to advertise as an iBeacon ?

Thanks in advance.

Hi Prashant,

What does the 'Major Number' and 'Minor Number' represent in the beacon terminology ?

Thanks and Regards
Pranjal Saxena

Hi Pranjal, these are just two arbitrary numbers that you can use to recognise/organise your iBeacons. Refer to Apple's iBeacon documentation for more info.