Re: [Bluez-users] TPL is not changing

[Marcel Holtmann <marcel@holtmann.org>]

Hi Kazuhiro,

> I've installed bluez-libs-2.8-1 and bluez-utils-2.8-1 on our linux 2.4.27 systems with 
> HAGIWARA SYS-COM HNT-CFBT Bluetooth cards.
> 
> I measured TPL on one computer and found that it was always 0 independently of the  
> distance between devices.
> 
> The following is the result of actual measurement.
> 
> [root@localhost root]# hcitool cc 00:90:02:XX:XX:XX
> [root@localhost root]# hcitool tpl 00:90:02:XX:XX:XX
> Current transmit power level: 0
> [root@localhost root]# hcitool rssi 00:90:02:XX:XX:XX
> RSSI return value: -3
> [root@localhost root]# hcitool tpl 00:90:02:XX:XX:XX
> Current transmit power level: 0
> [root@localhost root]# hcitool rssi 00:90:02:XX:XX:XX
> RSSI return value: -13
> [root@localhost root]# hcitool dc 00:90:02:XX:XX:XX
> 
> As you can see, RSSI is changing according to the distance between devices, but 
> TPL is not.
> 
> I would like to know the reason of this phenomenon.

this is maybe, because your card doesn't support it. What does
"hciconfig -a" say?

Regards

Marcel




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