[Bluez-users] Inquiry time

[Bluez-users] Inquiry time

[Walter Bamberger]

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I have a Nokia N70 mobile phone and a MSI 3X BTOES (Ver. 476-BW). Both
claim to be Bluetooth 2.0+EDR devices. As I read, those device have an
improved device inquiry time of about 4 seconds.

However when I do a

	hcitool scan

or a
	
	hcitool inq

both take the usual 10 to 12 seconds as of Bluetooth 1.1. What is the
reason for this behaviour and how can I change it?

Below I added some information about the devices.

Thanks, Simon




$ sudo hcitool info 00:17:4B:14:F2:A8
Requesting information ...
        BD Address:  00:17:4B:14:F2:A8
        Device Name: Nokia N70
        LMP Version: 2.0 (0x3) LMP Subversion: 0x6cc
        Manufacturer: Cambridge Silicon Radio (10)
        Features: 0xbf 0xee 0x0f 0x46 0x98 0x19 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset>
                <timing accuracy> <role switch> <sniff mode> <RSSI>
                <channel quality> <SCO link> <HV3 packets> <u-law log>
                <A-law log> <CVSD> <paging scheme> <power control>
                <transparent SCO> <EDR ACL 2 Mbps> <EDR ACL 3 Mbps>
                <inquiry with RSSI> <AFH cap. slave> <AFH class. slave>
                <3-slot EDR ACL> <5-slot EDR ACL> <AFH cap. master>
                <AFH class. master>


$ sudo hciconfig -a
hci0:   Type: USB
        BD Address: 00:02:72:CA:36:97 ACL MTU: 1017:8 SCO MTU: 64:8
        UP RUNNING PSCAN ISCAN
        RX bytes:1905 acl:0 sco:0 events:61 errors:0
        TX bytes:419 acl:0 sco:0 commands:29 errors:0
        Features: 0xff 0xff 0x8d 0xfe 0x9b 0xf9 0x00 0x80
        Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
        Link policy: RSWITCH HOLD SNIFF PARK
        Link mode: SLAVE ACCEPT
        Name: 'ldvpc19-0'
        Class: 0x3e0100
        Service Classes: Networking, Rendering, Capturing
        Device Class: Computer, Uncategorized
        HCI Ver: 2.0 (0x3) HCI Rev: 0x204d LMP Ver: 2.0 (0x3) LMP
Subver: 0x4127        Manufacturer: Broadcom Corporation (15)


$ hciconfig hci0 features
hci0:   Type: USB
        BD Address: 00:02:72:CA:36:97 ACL MTU: 1017:8 SCO MTU: 64:8
        Features: 0xff 0xff 0x8d 0xfe 0x9b 0xf9 0x00 0x80
                <3-slot packets> <5-slot packets> <encryption> <slot offset>
                <timing accuracy> <role switch> <hold mode> <sniff mode>
                <park state> <RSSI> <channel quality> <SCO link> <HV2
packets>
                <HV3 packets> <u-law log> <A-law log> <CVSD> <power control>
                <transparent SCO> <broadcast encrypt> <EDR ACL 2 Mbps>
                <EDR ACL 3 Mbps> <enhanced iscan> <interlaced iscan>
                <interlaced pscan> <inquiry with RSSI> <extended SCO>
                <EV4 packets> <EV5 packets> <AFH cap. slave>
                <AFH class. slave> <3-slot EDR ACL> <5-slot EDR ACL>
                <AFH cap. master> <AFH class. master> <EDR eSCO 2 Mbps>
                <EDR eSCO 3 Mbps> <3-slot EDR eSCO> <extended features>


$ hciconfig hci0 inqmode
hci0:   Type: USB
        BD Address: 00:02:72:CA:36:97 ACL MTU: 1017:8 SCO MTU: 64:8
        Inquiry mode: Standard Inquiry


wbam@ldvpc19:~$ hciconfig hci0 inqtype
hci0:   Type: USB
        BD Address: 00:02:72:CA:36:97 ACL MTU: 1017:8 SCO MTU: 64:8
        Inquiry scan type: Interlaced Inquiry Scan

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Re: [Bluez-users] Inquiry time

[Marcel Holtmann]

Hi Walter,

> I have a Nokia N70 mobile phone and a MSI 3X BTOES (Ver. 476-BW). Both
> claim to be Bluetooth 2.0+EDR devices. As I read, those device have an
> improved device inquiry time of about 4 seconds.

there exists nothing like this. You can decrease the time a device
spends in inquiry, but then you might also only find a small fraction of
devices. Check the hcitool manual page for options to change the inquiry
time.

Regards

Marcel



-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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