Re: Re : BLE -Multiple connection

Re: Re : BLE -Multiple connection

[Anderson Lizardo]

Hi Ajay,

On Wed, Aug 22, 2012 at 4:49 PM, Ajay KV <ajay.kv@globaledgesoft.com> wrote:
>             I think we already discussed about this issue  . following is
> our previous conversation. please go through it

Please, try to disable HTML on your email client and send plain text
e-mails. It is difficult to follow your discussion with all this HTML.
It is very likely people are not helping you because your emails are
unreadable for a lot of people here.

Much information is missing from your previous messages:

1) You did not provide the exact steps you followed (which commands
you run after plugging the bluetooth dongle). Therefore it is
difficult to reproduce your tests.
2) Your HCI dump output shows just the command giving error. This is
not enough, you should provide the entire dump since the adapter was
plugged, including the first "B to A" connection you described, and
the second LE advertising attempt, otherwise it is not possible to
identify at which state the LE controller is when the LE adv. enable
command is issued.

Also, do you realize that you are not allowed by the current Core spec
v4.0 to have one dual mode device connected to another dual mode over
the LE link? The spec says that a dual mode device in "connectable
mode" (like device "A" in you original scenario) shall not be issuing
connectable advertising over the LE channel. This is not enforced by
the controller (and we actually do this for testing BlueZ to BlueZ
connections over LE), but the spec explicitly forbids it.

Regards,
-- 
Anderson Lizardo
Instituto Nokia de Tecnologia - INdT
Manaus - Brazil

Re: Re : BLE -Multiple connection

[Ajay KV]

On 08/22/2012 08:24 AM, Anderson Lizardo wrote:
> Hi Ajay,
>
> On Wed, Aug 22, 2012 at 4:49 PM, Ajay KV<ajay.kv@globaledgesoft.com>  wrote:
>>              I think we already discussed about this issue  . following is
>> our previous conversation. please go through it
>
> Please, try to disable HTML on your email client and send plain text
> e-mails. It is difficult to follow your discussion with all this HTML.
> It is very likely people are not helping you because your emails are
> unreadable for a lot of people here.
>
> Much information is missing from your previous messages:
>
> 1) You did not provide the exact steps you followed (which commands
> you run after plugging the bluetooth dongle). Therefore it is
> difficult to reproduce your tests.
> 2) Your HCI dump output shows just the command giving error. This is
> not enough, you should provide the entire dump since the adapter was
> plugged, including the first "B to A" connection you described, and
> the second LE advertising attempt, otherwise it is not possible to
> identify at which state the LE controller is when the LE adv. enable
> command is issued.
>
> Also, do you realize that you are not allowed by the current Core spec
> v4.0 to have one dual mode device connected to another dual mode over
> the LE link? The spec says that a dual mode device in "connectable
> mode" (like device "A" in you original scenario) shall not be issuing
> connectable advertising over the LE channel. This is not enforced by
> the controller (and we actually do this for testing BlueZ to BlueZ
> connections over LE), but the spec explicitly forbids it.
>
> Regards,



Hi Anderson,

	First of all, sorry for my ignorance . Following are the steps i did in 
my test case.  i am also using dual mode dongles , so as you said  spec 
is not allowing us to do  this operation

In device A side:

1: Enable advertise using  hciconfig  hci0 leadv
2: run "l2test" tool in bluez  as a  server   ( slight modification has 
been made  in this code, like we are explicitly making cid as 0x04 )

  In Device B side:

1: Enable scanning  using  hcitool lescan
2: run "l2test -S <bdaddr A>"   as a  client   ( slight modification has 
been made  in this code, like we are explicitly making cid as 0x04)

      now the LE  connection is established  b/w A and B and data starts 
transferring

In this state i can not able to enable or disable advertise again , 
showing "command disallowed"

In Device C side

1; Enabled LE scanning , but device A is not detecting since it is 
connected to device B
2: ran  l2test -s <bdaddr A > as client  gives connection timed out


   Only essential log messages are given below
  DEVICE A

< HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1
     value 0x01 (advertising enabled)
 > HCI Event: Command Complete (0x0e) plen 4
     LE Set Advertise Enable (0x08|0x000a) ncmd 1
 > HCI Event: LE Meta Event (0x3e) plen 19
     LE Connection Complete
       status 0x00 handle 43, role slave

data  receiving.......

DEVICE B
< HCI Command: LE Create Connection (0x08|0x000d) plen 25
     bdaddr 00:1B:DC:05:E0:5D type 0
 > HCI Event: Command Status (0x0f) plen 4
     LE Create Connection (0x08|0x000d) status 0x00 ncmd 1
 > HCI Event: LE Meta Event (0x3e) plen 19
     LE Connection Complete
       status 0x00 handle 64, role master

data sending.......

  Now if tries to enable or disable advertising  in Device A it shows 
error as follows

root@localhost ~]# hciconfig 0 leadv
LE set advertise enable on hci0 returned status 12

< HCI Command: LE Set Advertise Enable (0x08|0x000a) plen 1
     value 0x01 (advertising enabled)
 > HCI Event: Command Complete (0x0e) plen 4
     LE Set Advertise Enable (0x08|0x000a) ncmd 1
     status 0x0c pktlen 0x0004 maxpkt 0x38
     Error: Command Disallowed



DEVICE C

< HCI Command: LE Create Connection (0x08|0x000d) plen 25
     bdaddr 00:1B:DC:05:E0:5D type 0
 > HCI Event: Command Status (0x0f) plen 4
     LE Create Connection (0x08|0x000d) status 0x00 ncmd 1
< HCI Command: LE Create Connection Cancel (0x08|0x000e)plen 0
 > HCI Event: Command Complete (0x0e) plen 4
     LE Create Connection Cancel (0x08|0x000e) ncmd 1
 > HCI Event: LE Meta Event (0x3e) plen 19
     LE Connection Complete
       status 0x02 handle 0, role master


BR,
   ajay.kv












	
















	
	

Re: Re : BLE -Multiple connection

[Anderson Lizardo]

Hi Ajay,

On Wed, Aug 22, 2012 at 7:18 PM, Ajay KV <ajay.kv@globaledgesoft.com> wrote:
>         First of all, sorry for my ignorance . Following are the steps i did
> in my test case.  i am also using dual mode dongles , so as you said  spec
> is not allowing us to do  this operation
> [snip]

I remembered that the Core spec mentions that it is not required for a
controller to support more than one connection. Maybe it is the case
for the dongles you have? In this case, the controller will not allow
to send connectable advertising because of the active connection.

(sorry, I could not find the section of the spec that mentions this)

If you close the connection, are you able to run "hciconfig hci0
leadv" again on "A"?

Regards,
-- 
Anderson Lizardo
Instituto Nokia de Tecnologia - INdT
Manaus - Brazil

Re: Re : BLE -Multiple connection

[Ajay KV]

On 08/22/2012 12:01 PM, Anderson Lizardo wrote:
> Hi Ajay,
>
> On Wed, Aug 22, 2012 at 7:18 PM, Ajay KV<ajay.kv@globaledgesoft.com>  wrote:
>>          First of all, sorry for my ignorance . Following are the steps i did
>> in my test case.  i am also using dual mode dongles , so as you said  spec
>> is not allowing us to do  this operation
>> [snip]
>
> I remembered that the Core spec mentions that it is not required for a
> controller to support more than one connection. Maybe it is the case
> for the dongles you have? In this case, the controller will not allow
> to send connectable advertising because of the active connection.
>
> (sorry, I could not find the section of the spec that mentions this)
>
> If you close the connection, are you able to run "hciconfig hci0
> leadv" again on "A"?
>
> Regards,


Hi ,

	yes , exactly the moment the connection get terminates ,  i could able 
to enable advertise again. The intresting point is that during connected 
mode , even advertise disable  is also giving the same "command 
disallowed" error.

regards

Re: Re : BLE -Multiple connection

[Anderson Lizardo]

Hi Ajay,

On Thu, Aug 23, 2012 at 9:50 AM, Ajay KV <ajay.kv@globaledgesoft.com> wrote:
>         yes , exactly the moment the connection get terminates ,  i could
> able to enable advertise again. The intresting point is that during
> connected mode , even advertise disable  is also giving the same "command
> disallowed" error.

I found the answer to your problem on the Core Spec, see my other email :)

Best Regards,
-- 
Anderson Lizardo
Instituto Nokia de Tecnologia - INdT
Manaus - Brazil