Re: [Bluez-devel] not able to send SCO voice data

[Marcel Holtmann <marcel@holtmann.org>]

Hi Johan,

> I'm trying to run the hstest and am unable to send any SCO voice data to
> the headset. Receiving SCO voice data from the headset works OK. After
> several successful writes to the SCO socket it returns an error. None of
> the successful writes have actually been transmitted over the HCI UART
> link.
> 
> hciconfig returns:
>   ACL MTU: 120:20  SCO MTU: 64:0
> 
> The 'hci read buffer size' command returns:
>   < HCI Command: Read Buffer Size (0x04|0x0005) plen 0
>   > HCI Event: Command Complete (0x0e) plen 11
>     01 05 10 00 78 00 00 14 00 00 00
> 
> What I think is happening, is that the BlueZ stack thinks the bluetooth
> device has not got any space to store any SCO packets since the 'hci
> read buffer size' command returns 0 for HC_Total_Num_SCO_Data_Packets
> and also 0 for HC_SCO_Data_Packet_Length, and therefore does not send
> any SCO data and at some point runs out of internal buffers and returns
> an error in the write to the SCO socket.
> 
> Is this assumption correct?, Or does the BlueZ stack interpret the 0
> HC_Total_Num_SCO_Data_Packets as meaning the bluetooth device does not
> support flow control as is intended by the bluetooth device, and
> something else goes wrong?

I don't think that this is the problem. Since you use an UART as host
transport you should try a voice setting of 0x0040 and modify the hstest
tool to use 8bit instead of 16bit.

Regards

Marcel




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