Hi,
I have tried to analyse the below scenario & here is my
understanding. Kindly Correct if the below is wrong.
In my linux netbook, Bluetooth Chip used eSCO.
where as the headset is Jabra 620s which supports only SCO.
The VOIP software calls headset_request_stream to establish SCO link.
once the audio is finished ,the VOIP software calls
headset_unlock->headset_set_state->close_sco.
when again VOIP software wants to play a sound it again calls
sco_connect(headset_request_stream).
Down in the kernel at this point when Usermode BlueZ has asked for
sco_connect,It calls hci_connect(type=ESCO) --->this is because the
linux netbook has eSCO bluetooth CHip.
In hci_connect ,it only checks if there is ESCO link,if not sends a
Setup Synchronous Connection[ Initiates Disconnect of SCO & before
Disconnect Complete Evnt,the Headset sends Setup Complete but LMP
reports 0X0A max number of synchronous connections exceeded].
But i think in hci_connect it should also check if there is any SCO
link to the headset,if so reuse the same.I am talking about the below
code.
if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst))) {
if (!(sco = hci_conn_add(hdev, type, dst))) {
hci_conn_put(acl);
return NULL;
}
}
should this be changed to
new_type = (type == ESCO_LINK) ? SCO_LINK : ESCO_LINK;
if (!(sco = hci_conn_hash_lookup_ba(hdev, type, dst)) && ((!(sco
= hci_conn_hash_lookup_ba(hdev, new_type, dst)) {
if (!(sco = hci_conn_add(hdev, type, dst))) {
hci_conn_put(acl);
return NULL;
}
}
Please suggest if there is any other alternative to the above.Let me
know if i need to give any other details.
Regards,
Sreevani M
> Hi,
> i have the following query.
> a) (headset.c) headset_unlock
> ->headset_set_state(...HEADSET_CONNECTED),which in turn calls the
> close_sco.
> close_sco calls g_io_channel_shutdown().
> I want to know whether g_io_channel_shutdown() triggers the sending of
> HCI_Disconnect_Req(to remove SCO) to the LMP .
> b) Also wanted to know,will the user mode BlueZ get an indication ,(if
> so through which function),when the LMP sends a Disconnect Complete
> Event to the Host.
>
for b) i think user mode bluez gets this indication through
hcid_dbus_disconn_complete.
>
> I am asking the above as i see in the HCI dump, Disconnect &
> Disconnect Complete messages, the issue i am facing is user mode BlueZ
> calls close_sco & then calls headset_request_stream which again asks
> for sco_connect(). Before the Disconnect Complete Evt is posted by
> LMP. LMP reports Synchrnous Connection LImit to Device Exceeded(0X0A)
> for the Synchrounous Setup Complete .
>
> Snippet of hcidump is given below:
> 2009-05-08 13:43:47.540906 < HCI Command: Setup Synchronous Connection
> (0x01|0x0028) plen 17
> handle 42 voice setting 0x0060
> 2009-05-08 13:43:47.545632 > SCO data: handle 50 flags 0x00 dlen 48
> 0000: c1 fe ed fc f7 fb 4d fa ed f8 28 f9 cf fa d1 fd ......M...(.....
> 0020: 05 03 71 00 c4 fd fe fc 77 fe 54 00 ef 01 8d 03 ..q.....w.T.....
> 2009-05-08 13:43:47.554646 > HCI Event: Command Status (0x0f) plen 4
> Setup Synchronous Connection (0x01|0x0028) status 0x00 ncmd 1
> 2009-05-08 13:43:47.554705 < HCI Command: Disconnect (0x01|0x0006) plen 3
> handle 50 reason 0x13
> Reason: Remote User Terminated Connection
> 2009-05-08 13:43:47.565632 > SCO data: handle 50 flags 0x00 dlen 48
> 0000: 3a 06 4b 07 a3 05 bc 01 e7 fe 48 ff 5f ff e7 fc :.K.......H._...
> 0020: 2b 00 aa 04 0e 09 b6 08 ce 03 92 fb 53 f5 fb f6 +...........S...
> 2009-05-08 13:43:47.566646 > HCI Event: Command Status (0x0f) plen 4
> Disconnect (0x01|0x0006) status 0x00 ncmd 0
> 0020: 62 fd e0 ff d3 00 e1 00 f3 01 eb 05 46 0a 42 0c b...........F.B.
> 2009-05-08 13:43:47.597617 > HCI Event: Synchronous Connect Complete
> (0x2c) plen 17
> status 0x0a handle 42 bdaddr 00:13:17:71:FD:88 type SCO
> Error: Synchronous Connection to a Device Exceeded
> 2009-05-08 13:43:47.605629 > SCO data: handle 50 flags 0x00 dlen 48
> 0000: a7 0b 36 09 f4 05 0e 04 89 04 4e 04 ec 03 52 03 ..6.......N...R.
> 0010: d6 00 85 fe 01 fd 08 fc ad fb 6d fa 21 f8 3f f5 ..........m.!.?.
> 2009-05-08 13:43:47.607631 > HCI Event: Command Status (0x0f) plen 4
> Unknown (0x00|0x0000) status 0x00 ncmd 1
> 2009-05-08 13:43:47.615616 > SCO data: handle 50 flags 0x00 dlen 48
> 0000: 1f f7 44 f9 32 fb ed fc bd fd d2 fe 32 01 19 04 ..D.2.......2...
> 0020: 20 07 19 04 4b 02 bf 01 d7 00 d8 fd 77 fa 2a f9 ...K.......w.*.
> 2009-05-08 13:43:47.635626 > SCO data: handle 50 flags 0x00 dlen 48
> 0000: e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 ................
> 0020: e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 e5 f8 ................
> 2009-05-08 13:43:47.638651 > HCI Event: Disconn Complete (0x05) plen 4
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