BLE -Multiple connection

Hi Ajay,

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

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)

    LE Set Advertise Enable (0x08|0x000a) ncmd 1

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

    LE Create Connection (0x08|0x000d) status 0x00 ncmd 1

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)

    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

    LE Create Connection (0x08|0x000d) status 0x00 ncmd 1

< HCI Command: LE Create Connection Cancel (0x08|0x000e)plen 0

    LE Create Connection Cancel (0x08|0x000e) ncmd 1

LE Connection Complete
status 0x02 handle 0, role master

BR,
ajay.kv

Hi Ajay,

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

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

Hi Ajay,

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