tcpdump mailing list archives
Re: DLT for Bluetooth Low Energy
From: Guy Harris <guy () alum mit edu>
Date: Thu, 13 Jun 2013 19:34:26 -0700
On Jun 13, 2013, at 7:24 PM, Mike Ryan <mikeryan () lacklustre net> wrote:
Hi, I impelemented most of the BTLE support in Ubertooth.So do LINKTYPE_BLUETOOTH_LE_LL/DLT_BLUETOOTH_LE_LL packets include the preamble octet and the CRC?They include the 3 octet CRC, they do not include the preamble.
OK, I'll update the description on the "link-layer header types" page to note that. So the packet in the file has: 4 bytes of Access Address; 2-39 bytes of packet data; 3 bytes of CRC; in sequential order, with nothing separating them, right?
To validate the CRC you must know a per-connection CrcInit. This value will be stored in the PPI with each packet.
"Stored in the PPI"? Does that mean "stored in per-packet information kept by the program reading the capture file", or does it mean "per-packet information stored *in* the capture file"? If the latter, that presumably means there's some form of pseudo-header preceding the Access Address. _______________________________________________ tcpdump-workers mailing list tcpdump-workers () lists tcpdump org https://lists.sandelman.ca/mailman/listinfo/tcpdump-workers
Current thread:
- DLT for Bluetooth Low Energy dragorn (May 16)
- Re: DLT for Bluetooth Low Energy Michal.Labedzki (Jun 11)
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 13)
- Message not available
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 13)
- Message not available
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 13)
- Re: DLT for Bluetooth Low Energy Mike Ryan (Jun 13)
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 13)
- Re: DLT for Bluetooth Low Energy Mike Ryan (Jun 13)
- Re: DLT for Bluetooth Low Energy Mike Ryan (Jun 13)
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 14)
- Re: DLT for Bluetooth Low Energy Mike Ryan (Jun 14)
- Re: DLT for Bluetooth Low Energy Guy Harris (Jun 14)
- Message not available