Of what does a notification package consist? ( Packet Structure )

[muhkuhns]

I mean what kind of header information and stuff besides the data. I could only find this for advertising packets.

A graphic or list like this would be nice:

byte 0-1 // byte 2-30 // byte 31

sendername // data // crc

and a citable source :)

[endnode]

Well citable source is easy: BT SIG specification 4.0 or higher;) If you mean "Handle Value Notification ATT method" it is standard PDU, isn't it? I'll leave these few drawings here but I believe you'd like to to get access to this presentation: original presentation by BT SIG from 2010 during official introduction of LE as part of BT 4.0 (member login required but registration is for free).

Cheers Jan

PDU on LE LL layer

PDU on LE ATT layer (no authentication)

PDU on LE ATT layer (authentication signature)

Note:

"Opcode" for "Handle Value Notification" ATT method is 0x1B. "Attribute Parameters" consists of 16-bit ATT handle number and actual data.

[LJohn]

Unfortunately I was unable to see the presentation as it requires a membership, which is not available to individuals. Also, I indeed do not understand the BT smart stack in detail. My goal was document my work by drawing a graphic of the BT LE packet to visualize how much space my 8 bytes of data take up in the PDU and where they are located. To complete the graphic I wanted to also show the space available for further data. However, I am lacking the information what else is filling up the PDU. I will start reading into BT smart in more detail, which I was hoping I could avoid initially, but now seems to make sense. And thanks for your answer!