Re: [Bluez-users] Test Mode

[Steven Singer <steven.singer@csr.com>]

Manjunath Prabhu wrote:
> Status shows 11 which is "HCI unsupported feature". I am using  a
> version 1.1 anycom-120 usb dongle.

Maybe the device doesn't support loopback.

It's not mandatory (in fact, nothing at HCI is mandatory - it's not a
qualifiable stack layer). There's no features bit to tell you if it's
supported as it's a test command.

The Anycom-120 dongle is a Silicon Wave dongle. I don't know if they put
loopback support in all (any?) of their dongles. It's not really that
useful for anything other than host code testing (which most people
don't want to do).

CSR devices support loopback (but we don't test it that thoroughly since
hardly anybody ever uses it, and even when they do it's as a test so
they don't care if it's not that robust).

Use hciconfig -a to see if it's a 1.2 device. If it is, it might
support the HCI_Read_Local_Supported_Commands command, which will give
you a list of all the commands the dongle supports. Use the BT 1.2 spec
to find out the OCF and OGF and to decode the result.

Having said that, even it it's a 1.2 device it might not support the
HCI_Read_Local_Supported_Commands command (in which case it should
return error code 0x01).

Even then, it might claim to support the loopback command as it may
understand the command but be unable to enter loopback mode for some
other reason (like, for example, the loopback command must be the first
command after a reset for some manufacturer specific reasons, or the
device must not be scanning).

If you really need the feature then contact the manufacturer directly.
However, most people have no use for the command, so don't be too
surprised if it's not supported.

	- Steven



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