Re: [Bluez-devel] Capture HCI traffic between an embeddec BlueCore and Host

[Steven Singer <steven.singer@csr.com>]

Ruud Beukema wrote:
>>>From a CSR powerpoint presentation I found out the BCSP packet header's
> "protocol type nibble" can hold the following values (with their
> meanings):
> Protocol 0 is for ACK=E2=80=99s only
> Protocol 1 is for Link Establishment
> Protocol 5 is for Commands/Events
> Protocol 6 is for ACL Data
> Protocol 7 is for SCO Data
>=20
> The HCI packet types defined are these
> HCI_COMMAND_PKT 0x01
> HCI_ACLDATA_PKT 0x02
> HCI_SCODATA_PKT 0x03
> HCI_EVENT_PKT   0x04
> HCI_VENDOR_PKT  0xFF
>=20
> I have BCSP header information available in my program and I have to
> give this packet type byte a value. The problem here is that when I see
> a protocol 5 (for COMMANDS and EVENTS) I still don't know whether it's =
a
> HCI_COMMAND_PKT or a HCI_EVENT_PKT.

This is easy. Packets going from the host to the controller on channel
5 are commands. Packets going from the controller to the host are
events.

As a double check, HCI commands start with the following byte
sequence:

  opcode_low opcode_high param_len

whereas events start with:

  event_code param_len

So, for commands, the BCSP payload length is payload[2] + 3 whereas for
events it's payload[1] + 2. This can allow you to detect traces which
are the wrong way round.

	- Steven
--=20


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