Re: [Bluez-users] TPL is not changing

[Alain Volmat <avolmat@src.ricoh.co.jp>]

Hi All,

the HAGIWARE SYS-COM card is a pretty old Ericsson based card and it
doesn't support TPL. See the output of hciconfig:

hci0:   Type: PCCARD
        BD Address: 00:90:02:05:1D:56 ACL MTU: 672:8 SCO MTU: 64:0
        Features: 0xff 0xfb 0x01 0x00 0x00 0x00 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset>
                <timing accuracy> <role switch> <hold mode> <sniff mode>
                <park state> <RSSI> <SCO link> <HV2 packets> <HV3 packets>
                <u-law log> <A-law log> <CVSD>

Alain

* Marcel Holtmann [Sun, 30 Jan 2005 at 15:37 +0100]
<quote>
> 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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