Request with RSSI

Marcel,
I want to get RSSI value when inquiring, and my dongole support the feature:

  mylinux:/home/lucharse# hciconfig hci0 features
hci0:   Type: USB
        BD Address: 00:11:67:19:3D:EC ACL MTU: 678:8 SCO MTU: 48:10
        Features: 0xbf 0xfe 0x8d 0x78 0x08 0x18 0x00 0x00
                <3-slot packets> <5-slot packets> <encryption> <slot offset>
                <timing accuracy> <role switch> <sniff mode> <RSSI>
                <channel quality> <SCO link> <HV2 packets> <HV3 packets>
                <u-law log> <A-law log> <CVSD> <power control>
                <transparent SCO> <broadcast encrypt> <enhanced iscan>
                <interlaced iscan> <interlaced pscan> <inquiry with RSSI>
                <AFH cap. slave> <AFH cap. master> <AFH class. master>

I set the inquiry mode to 1 which is inquiry with RSSI:

  mylinux:/home/lucharse# hciconfig hci0 inqmode 1
mylinux:/home/lucharse# hciconfig hci0 inqmode
hci0:   Type: USB
        BD Address: 00:11:67:19:3D:EC ACL MTU: 678:8 SCO MTU: 48:10
        Inquiry mode: Inquiry with RSSI

But when I use the sample code from from Scott W Gifford(http://sourceforge.net/mailarchive/message.php?msg_id=10195457) which is claimed to inquiry with RSSI, the output shows that the inquiry result without RSSI value. and the hcidump(-X -V) show the event type is EVT_INQUIRY_RESULT.

  mylinux:/home/lucharse/testcase# ./a.out
activate_rssi: err=0
begin_inquiry: starting
Polling...
Got event!  Type is 2
inquiry_result: num 1
 00:0F:B3:9B:04:D3:    ?
Polling...
Got event!  Type is 2
inquiry_result: num 1
 00:14:A4:D7:52:48:    ?
Polling...
Got event!  Type is 2
inquiry_result: num 1
 00:14:A4:D7:52:91:    ?
Polling...
Got event!  Type is 2
inquiry_result: num 1
 00:20:E0:7A:F4:E6:    ?
Polling...
Polling...
Program finished.
cancel_inquiry: err=0

while using hcidump -X -V:

  mylinux:/home/lucharse/# hcidump -X -V
HCI sniffer - Bluetooth packet analyzer ver 1.31
device: hci0 snap_len: 1028 filter: 0xffffffff
< HCI Command: Write Inquiry Mode (0x03|0x0045) plen 1
    mode 1

    Write Inquiry Mode (0x03|0x0045) ncmd 1
    status 0x00
< HCI Command: Inquiry (0x01|0x0001) plen 5
    lap 0x9e8b33 len 48 num 0

    Inquiry (0x01|0x0001) status 0x00 ncmd 1

    bdaddr 00:0F:B3:9B:04:D3 mode 1 clkoffset 0x10e4 class 0x020104

    bdaddr 00:14:A4:D7:52:48 mode 1 clkoffset 0x7c5a class 0x72010c

    bdaddr 00:14:A4:D7:52:91 mode 1 clkoffset 0x4c9b class 0x72010c

    bdaddr 00:20:E0:7A:F4:E6 mode 1 clkoffset 0x6ec5 class 0x00010c

< HCI Command: Inquiry Cancel (0x01|0x0002) plen 0

    Inquiry Cancel (0x01|0x0002) ncmd 1
    status 0x00

in your last mail, you ask me to to use hcidump(-X -V), but I can't see the RSSI value.

The sample code I used uses the HCI raw socket, and I review the DBus API(bluez-utils-3.1), I don't know which API can give me the RSSI wheng inquirying.

How do you think about it?

Hi,

if you run "hcidump -X -V" and then start an inquiry you should see the new inquiry result with RSSI event. However the inquiry() API call of the Bluetooth library can't handle the RSSI value. Even if the kernel sees it. There is no way to get it back to the application. So you either gonna use the HCI raw socket or the new BlueZ D-Bus API to actually get the RSSI value.

Regards

Marcel

Marcel Holtmann <[email protected]> 写道：
Hi,

please summarize your problem and repost to the BlueZ developer mailing list address. You used the wrong address and I didn't see it last time.

Regards

Marcel

With respects,
Mingfan.Lu

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Hi,

this is strange. If "hciconfig hci0 inqmode" tells you that you use Inquiry with RSSI then you should get the Inquiry with RSSI Results. What hardware is this (hciconfig hci0 version).

Regards

Marcel

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mylinux:/home/lucharse/ContentPushing # hciconfig hci0 version
hci0: Type: USB

        BD Address: 00:11:67:19:3D:EC ACL MTU: 678:8 SCO MTU: 48:10
        HCI Ver: 1.2 (0x2) HCI Rev: 0x1f4 LMP Ver: 1.2 (0x2) LMP Subver: 0x1f4
        Manufacturer: Integrated System Solution Corp. (57)

Marcel Holtmann <[email protected]> 写道： Hi,

this is strange. If "hciconfig hci0 inqmode" tells you that you use Inquiry with RSSI then you should get the Inquiry with RSSI Results. What hardware is this (hciconfig hci0 version).

Regards

Marcel

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With respects,
Mingfan.Lu

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Hi,

this chips firmware is totally broken. I just checked mine and I am seeing the same. No Inquiry with RSSI Result events.

However their support for Inquiry with RSSI is simply not there. See my tested inquiry mode settings:

# hciconfig hci0 inqmode 5
# sudo hciconfig hci0 inqmode
hci0:   Type: USB
        BD Address: 22:22:22:22:22:22 ACL MTU: 678:8 SCO MTU: 48:10
        Inquiry mode: Unknown (0x05)

So they store the value somewhere, but that's it.

If you wanna really use Inquiry with RSSI, then you might wanna make sure you get a CSR BlueCore4 based dongle. They simply work.

Regards

Marcel

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I can't understand your test , why you set the mode 5?
what is the relation between your result and the problem?

Marcel Holtmann <[email protected]> ：
Hi,

this chips firmware is totally broken. I just checked mine and I am seeing the same. No Inquiry with RSSI Result events.

However their support for Inquiry with RSSI is simply not there. See my tested inquiry mode settings:

# hciconfig hci0 inqmode 5
# sudo hciconfig hci0 inqmode
hci0: Type: USB
BD Address: 22:22:22:22:22:22 ACL MTU: 678:8 SCO MTU: 48:10
Inquiry mode: Unknown (0x05)

So they store the value somewhere, but that's it.

If you wanna really use Inquiry with RSSI, then you might wanna make sure you get a CSR BlueCore4 based dongle. They simply work.

Regards

Marcel

With respects,
Mingfan.Lu

---------------------------------
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Hi,

it means that they support the inquiry mode command, but don't do actually anything with it. Setting it to 5 is not allowed. So this command should fail and later on it should retrieve only 0 or 1 as valid values, but it doesn't. This leads to the conclusion that they only store the inquiry mode value somewhere, but never evaluate it. And this means they will never switch to Inquiry with RSSI as you have seen before.

Regards

Marcel

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Hi,
I reviewed the hciconfig.c.
If you set mode 5, it just output like you test. I can see any limitation of the mode num, 5 it can be dealt with. So, I don't think it can give such a conclusion you claimed.

static void cmd_inq_mode(int ctl, int hdev, char *opt)
{
int dd;
dd = hci_open_dev(hdev);
if (dd < 0) {
fprintf(stderr, "Can't open device hci%d: %s (%d)\n",

      hdev, strerror(errno), errno);
  exit(1);
 }
   if (opt) {
  uint8_t mode = atoi(opt);
    if (hci_write_inquiry_mode(dd, mode, 2000) < 0) {
   fprintf(stderr, "Can't set inquiry mode on hci%d: %s (%d)\n",
      hdev, strerror(errno), errno);
   exit(1);
  }
 } else {
  uint8_t mode;
    if (hci_read_inquiry_mode(dd, &mode, 1000) < 0) {
   fprintf(stderr, "Can't read inquiry mode on hci%d: %s (%d)\n",
      hdev, strerror(errno), errno);
   exit(1);
  }
    print_dev_hdr(&di);

printf("\tInquiry mode: ");
switch (mode) {
case 0:
printf("Standard Inquiry\n");
break;
case 1:
printf("Inquiry with RSSI\n");
break;
case 2:
printf("Inquiry with RSSI or Extended Inquiry\n"); break;
default:
printf("Unknown (0x%02x)\n", mode);
break;
}
}
hci_close_dev(dd);
}

Marcel Holtmann <[email protected]> 写道：
Hi,

it means that they support the inquiry mode command, but don't do actually anything with it. Setting it to 5 is not allowed. So this command should fail and later on it should retrieve only 0 or 1 as valid values, but it doesn't. This leads to the conclusion that they only store the inquiry mode value somewhere, but never evaluate it. And this means they will never switch to Inquiry with RSSI as you have seen before.

Regards

Marcel

_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel

With respects,
Mingfan.Lu

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Hi,

this has nothing to do with our code. The chip must refuse any values other than 0 and 1. And such a behavior leads the conclusion that their implementation doesn't care about the inquiry mode at all. Otherwise they would have been more careful with the implementation.

Anyway, the firmware of this chip is broken. Get yourself a working dongle from CSR and you can use Inquiry with RSSI. Otherwise you can't.

Regards

Marcel

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I see. Thank you for your patience and nice answer.
I will get a new dongle :)
ps, is there any plan for official document for bluez, although the bluez is being under development.

Marcel Holtmann <[email protected]> 写道：
Hi,

this has nothing to do with our code. The chip must refuse any values other than 0 and 1. And such a behavior leads the conclusion that their implementation doesn't care about the inquiry mode at all. Otherwise they would have been more careful with the implementation.

Anyway, the firmware of this chip is broken. Get yourself a working dongle from CSR and you can use Inquiry with RSSI. Otherwise you can't.

Regards

Marcel

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Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel

With respects,
Mingfan.Lu

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Hi,

what do you mean by document. We have manpages for all commands and there are some howtos you can find on the web.

Regards

Marcel

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