Subject: Re: [Bluez-devel] hcidump iconsistent byte ordering?
From: Marcel Holtmann <marcel@holtmann.org>
To: BlueZ Mailing List <bluez-devel@lists.sourceforge.net>
In-Reply-To: <ct30se$vsg$1@sea.gmane.org>
References: <ct30se$vsg$1@sea.gmane.org>
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Message-Id: <1106581698.8058.47.camel@pegasus>
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Date: Mon, 24 Jan 2005 16:48:18 +0100

Hi Luis,

> let's say I want to decipher the first two HCI events from the "hcitool 
> inq" dump:
> < HCI Command: Inquiry (0x01|0x0001) plen 5
>    33 8B 9E 08 64
>  > HCI Event: Command Status (0x0f) plen 4
>    00 01 01 04
> 
> Easily, the first one is the Inquiry command. Its command parameters are 
> specified (Bluetooth Specification 1.1) in this order: LAP, 
> Inquiry_Length, Num_Responses; so from the hcidump output we have:
> 
> 	LAP: 0x9E8B33 (general inquiry LAP)
> 	Inquiry_Length: 0x08
> 	Num_Responses: 0x64
> 
> so far so good; it makes sense, but how about the command status event? 
> the order of its event parameters from the specification is: Status, 
> Num_HCI_Command_Packets, Command_Opcode. So following the same procedure 
>   as before I would get:
> 	
> 	Status: 0x00
> 	Num_HCI_Command_Packets: 0x01
> 	Command_Opcode: 0x0401
> 
> but this doesn't make sense because Command_Opcode should be 0x0001 
> (Inquiry command). These bytes are now located as the two first bytes of 
> the output, and the reading order is different from that of LAP's order 
> in the Inquiry Command.
> 
> So, I'm asking, how must I read hcidump output in order to agree with 
> the specification?

the command opcode consists of OGF and OCF. Look at the specification on
how to encode them into the command opcode.

Regards

Marcel


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