Hey Marcel,
Marcel Holtmann <marcel <at> holtmann.org> writes:
>
> Hi Heba,
>
>>I am developing an application for automatic network discovery using
>>bluetooth
>>i.e. Running the application will result in connections to any other
>>computers
>>running the same application:
>>- Each application is running a server which accepts connections
>> (once a connection is made, the connection is maintained until a
>> transmission error occcurs or the socket is closed by either party);
>>- and a client which repeatedly queries for bluetooth devices to
>> connect to.
>>
>>So in total an application makes and
>>maintains 2*(#other applications) connections.
>>
>>This causes no problems when using the Belkin F8T003 Bluetooth USB Adaptor
>>(this is a bluetooth v1.1 compliant device).
>>
>>However, when using the Belkin F8T009 Bluetooth USB Adaptor
>>(this is a bluetooth v1.2 compliant device)
>>"Device or Resource Busy" errors are observed
>>when the application tries to query
>>when there are 3 or more connections maintained by it.
>>
>>I have installed all the latest versions:
>> - Bluez-lib
>> - Bluez-hcidump
>>I am running Fedora core 4 with the latest available updates of the kernel.
>>
>>I've used hcidump to try and figure it out, but all it tells me is:
>> HCI Command: Inquiry (0x01|0x0001) plen 5
>> lap 0x9e8b33 len 8 num 255
>> HCI Event: Command Status (0x0f) plen 4
>> Inquiry (0x01|0x0001) status 0x0c ncmd 1
>> Error: Command Disallowed
>>
>>This really doesn't help me to understand why this is happening.
>>The status of that particular bluetooth device
>>(a Belkin F8T003 Bluetooth USB bluetooth v1.1 compliant Adaptor)
>>when the error occurs is as follows:
>> a local server socket is listening for connections
>> two remote clients are connected to the device
>> a local client thread is attempting to query other devices
<< using hci_inquiry
>>
>
>send in the "hciconfig -a" output for both devices.
>
>Regards
>
>Marcel
>
I did hciconfig -a and realised that some of the machines said:
UP RUNNING PSCAN ISCAN
while some machines said:
UP RUNNING (only!)
so I made sure that "service bluetooth start" was called before running the
app,
however I still get "Device or Resource Busy" when some of the machines are
querying.
I have four machines
Linux-01 (with USB v1.2 Bluetooth adaptor)
Linux-02 (with USB v1.2 Bluetooth adaptor)
Linux-03 (with USB v1.2 Bluetooth adaptor)
Linux-oldDongle (with USB v1.1 Bluetooth adaptor)
Before starting hciconfig -a output is as follows:
Linux-01:
hci0: Type: USB
BD Address: 00:0A:3A:62:E5:A5 ACL MTU: 377:10 SCO MTU: 16:0
UP RUNNING PSCAN ISCAN
RX bytes:420 acl:0 sco:0 events:23 errors:0
TX bytes:585 acl:0 sco:0 commands:23 errors:0
Features: 0xff 0xfe 0x0d 0x38 0x08 0x08 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'Computer-04'
Class: 0x120104
Service Classes: Networking
Device Class: Computer, Desktop workstation
HCI Ver: 1.2 (0x2) HCI Rev: 0x0 LMP Ver: 1.2 (0x2) LMP Subver: 0x309
Manufacturer: Broadcom Corporation (15)
Linux-02:
hci0: Type: USB
BD Address: 00:0A:3A:62:E5:A9 ACL MTU: 377:10 SCO MTU: 16:0
UP RUNNING PSCAN ISCAN
RX bytes:372 acl:7 sco:0 events:27 errors:0
TX bytes:437 acl:7 sco:0 commands:17 errors:0
Features: 0xff 0xfe 0x0d 0x38 0x08 0x08 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'Computer-01-0'
Class: 0x120104
Service Classes: Networking
Device Class: Computer, Desktop workstation
HCI Ver: 1.2 (0x2) HCI Rev: 0x0 LMP Ver: 1.2 (0x2) LMP Subver: 0x309
Manufacturer: Broadcom Corporation (15)
Linux-03:
hci0: Type: USB
BD Address: 00:0A:3A:62:E3:17 ACL MTU: 377:10 SCO MTU: 16:0
UP RUNNING PSCAN ISCAN
RX bytes:372 acl:0 sco:0 events:15 errors:0
TX bytes:55 acl:0 sco:0 commands:15 errors:0
Features: 0xff 0xfe 0x0d 0x38 0x08 0x08 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'Broadcom BCM2035'
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Ver: 1.2 (0x2) HCI Rev: 0x0 LMP Ver: 1.2 (0x2) LMP Subver: 0x309
Manufacturer: Broadcom Corporation (15)
Linux-oldDongle:
hci0: Type: USB
BD Address: 00:0A:3A:62:81:FA ACL MTU: 192:8 SCO MTU: 64:8
UP RUNNING PSCAN ISCAN
RX bytes:936 acl:19 sco:0 events:51 errors:0
TX bytes:438 acl:20 sco:0 commands:21 errors:0
Features: 0xff 0xff 0x0b 0x00 0x00 0x00 0x00 0x00
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: SLAVE ACCEPT
Name: 'Heba'
Class: 0x020104
Service Classes: Networking
Device Class: Computer, Desktop workstation
HCI Ver: 1.1 (0x1) HCI Rev: 0x33c LMP Ver: 1.1 (0x1) LMP Subver: 0x33c
Manufacturer: Cambridge silicon radio (10)
The connections status at the time of failure to query is as follows:
Linux-01 is connected to all other machines
Linux-02 is connected to Linux-01 and Linux-oldDongle
Linux-03 is connected to all other machines
Linux-oldDongle is connected to all other machines
Linux-02 and Linux-03 are failing to query: "Device or Resource Busy"
and Linux-01 and Linux-oldDongle are querying,
however they are only finding 1 machine each.
All machines have maintained all their connections even if failing
to query.
Any insights you can give would be greatly appreciated.
Thanks,
Heba.
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