[Bluez-users] HCI_switch_role

[Bluez-users] HCI_switch_role

[Thor Egil Skaug]

Does anyone know why the HCI_switch_role command takes a BDADDR argument
instead of
a connectionhandle?

The role_change event should be sent from both devices to their
respective sw stacks after this.

I don't understand the following from the BT specification:

1. Is the BDADDR the address of the remote device, or the local device
(to the caller)?

2. In the returned event, what bdaddr is returned to the
(HCI_switch_role) calling stack, and what bdaddr
   is returned to the stack on the remote device?
3. What if there is more than one connection between two devices?

Thor


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Re: [Bluez-users] HCI_switch_role

[Peter Stephenson]

"Thor Egil Skaug" wrote:
> Does anyone know why the HCI_switch_role command takes a BDADDR argument
> instead of
> a connectionhandle?

It's not clear to me, either, but it may be for compatibility with the
role-change event when generated during connection creation: in that
case, the connection_complete event hasn't come up yet, so there's no
valid ACL handle.  Hence it has to report the BD ADDR (as with
the connection_request event).

> The role_change event should be sent from both devices to their
> respective sw stacks after this.
> 
> I don't understand the following from the BT specification:
> 
> 1. Is the BDADDR the address of the remote device, or the local device
> (to the caller)?

The remote device.

> 2. In the returned event, what bdaddr is returned to the
> (HCI_switch_role) calling stack, and what bdaddr
>    is returned to the stack on the remote device?

Each side reports the remote address (where it reports anything).

> 3. What if there is more than one connection between two devices?

There can't be, you can only have one ACL between any two devices.
This a specific error code acl_connection_already_exists or something
similar if you try and add another one.

pws


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RE: [Bluez-users] HCI_switch_role

[Thor Egil Skaug]

Is a slave allowed to switch role to master?

Thor


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RE: [Bluez-users] HCI_switch_role

[Marcel Holtmann]

Hi Thor,

> Is a slave allowed to switch role to master?

every side can switch the role.

Regards

Marcel




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Re: [Bluez-users] HCI_switch_role

[Steven Singer]

Marcel Holtmann wrote:
> Thor Egil Skaug wrote:
>> Is a slave allowed to switch role to master?
> 
> every side can switch the role.

Strictly, both sides can attempt to initiate a switch. Both sides are
also allowed to refuse.

Provided the baseband supports it (check the features) and the link
manager has been told to allow it (check the link policy) then it
should be OK (barring a burst of radio noise that knocks out critical
radio packets - in which case, just try again).

Note that although you can read the features for both sides, you can
check only the local link policy. However, instead of all that, you may
as well just go ahead and try to switch.

	- Steven
-- 



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