To: bluez-devel@lists.sourceforge.net
From: soraberri <421246@posta.unizar.es>
Message-ID: <ct30se$vsg$1@sea.gmane.org>
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Subject: [Bluez-devel] hcidump iconsistent byte ordering?
Sender: bluez-devel-admin@lists.sourceforge.net
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Reply-To: bluez-devel@lists.sourceforge.net
Date: Mon, 24 Jan 2005 15:31:14 +0100


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?

REgards

Luis Peiro


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