Re: [Bluez-devel] hcidump EDR packet type

[Mayank BATRA <mayank.batra@st.com>]

Hi Quinton,

> Wondering someone can help to enlighten me on where hci packet type bit
> is reversed for  change connection packet type command (issued by
> hcitool) for EDR mode, based on the below hcidump, seems 0x2000 is
> passed down (which should be 0x1306), however, return message ptype
> 0x1306 is correct even decoding is not right.

In case you wanted to change the packet type to 3-DH5 0x2000 is
perfectly fine since EDR packets are inverted i.e. they will be selected
if the corresponding bit is 0 and not 1. Internally, before sending the
change connection packet type command all stacks (hopefully BlueZ as
well) will xor the packet mask with the EDR packet type list. Thus if
you enabled an EDR packet (eg 0x2000 for 3-DH5), the bit for 3-DH5 will
be made 0 and bits for remaining EDR packets shall be made 1.

0x1306 means that 3-DH5 and DM1 have been selected on the ACL link which
is logical since DM1 is by default selected on all ACL links and you
just changed the packet type to 3-DH5.

=> There is nothing wrong going on except hcidump should be corrected to
parse the packet type mask properly. Here it should have shown only DM1
and 3-DH5.

Best Regards,

Mayank



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