Hi,
I am trying to write a program that forwards one rfcomm connection to
another connection, but each time I try make a 2nd connection out I get a
"Too many links(31)" error. Attached is my code but here is some simple
"psedo code" of it:
rcsocklisten = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
bind(rcsocklisten, (struct sockaddr *) &loc_addr, sizeof(loc_addr)
listen(rcsocklisten, 4)
rcsockin = accept(rcsocklisten, (struct sockaddr *)&rem_addr, &opt)
rcsockout = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
bind(rcsockout, (struct sockaddr *) &addr, sizeof(addr)
connect(rcsockout, (struct sockaddr *)&addr, sizeof(addr)
--ERROR here--
hcidump -V -x shows the following:
< HCI Command: Create Connection (0x01|0x0005) plen 13
bdaddr 00:80:C8:26:FD:6D ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> HCI Event: Command Status (0x0f) plen 4
Create Connection (0x01|0x0005) status 0x00 ncmd 1
> HCI Event: Connect Complete (0x03) plen 11
status 0x09 handle 0 bdaddr 00:80:C8:26:FD:6D type ACL encrypt 0x00
Error: Connection Limit Exceeded
The "Connection Limit Exceeded" is worry and confusing me as I have run
mutiple rfcomm connections through this chip before.
below are hciconfig -a on the 3 devices
[device rcloopback is run on]
hci0: Type: USB
BD Address: 00:0D:88:AC:DE:07 ACL MTU: 192:8 SCO MTU: 64:8
UP RUNNING
RX bytes:244095 acl:1979 sco:0 events:11528 errors:0
TX bytes:1472737 acl:11072 sco:0 commands:184 errors:0
Features: 0xff 0xff 0x0f 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: 'bent'
Class: 0x3e0100
Service Classes: Networking, Rendering, Capturing
Device Class: Computer, Uncategorized
HCI Ver: 1.1 (0x1) HCI Rev: 0x1bb LMP Ver: 1.1 (0x1) LMP Subver: 0x1bb
Manufacturer: Cambridge Silicon Radio (10)
[device connecting to rcloopback]
hci0: Type: USB
BD Address: 00:20:ED:09:59:57 ACL MTU: 192:8 SCO MTU: 64:8
UP RUNNING PSCAN ISCAN
RX bytes:181657222 acl:868257 sco:0 events:533586 errors:0
TX bytes:106682353 acl:645874 sco:0 commands:615 errors:0
Features: 0xff 0xff 0x0f 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: 'crooked'
Class: 0x3e0100
Service Classes: Networking, Rendering, Capturing
Device Class: Computer, Uncategorized
HCI Ver: 1.1 (0x1) HCI Rev: 0x110 LMP Ver: 1.1 (0x1) LMP Subver: 0x110
Manufacturer: Cambridge Silicon Radio (10)
[device rcloopback connects too]
hci0: Type: USB
BD Address: 00:80:C8:26:FD:6D ACL MTU: 192:8 SCO MTU: 64:8
UP RUNNING
RX bytes:394 acl:0 sco:0 events:18 errors:0
TX bytes:319 acl:0 sco:0 commands:17 errors:0
Features: 0xff 0xff 0x0f 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: 'ubuntu-0'
Class: 0x3e0100
Service Classes: Networking, Rendering, Capturing
Device Class: Computer, Uncategorized
HCI Ver: 1.1 (0x1) HCI Rev: 0x1bb LMP Ver: 1.1 (0x1) LMP Subver: 0x1bb
Manufacturer: Cambridge Silicon Radio (10)
Any help would be very much appreciated as I am hitting a brick wall...
--
David Mackie
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Hi David,
> > but maybe not multiple ACL connections and this is what you need in your
> > case. So you need at least a CSR chip with HCI 18.x firmware or you
> > might wanna simply use another dongle. One for the incoming data and one
> > for the outgoing data.
>
> Thanks Marcel for the quick answer. Though you are the messenger with the
> bad news... It had not crossed my mind that this could be a problem. Do
> you know where I can find some reference to this online?
you can look at my page for the CSR chips and their firmware. Besides
this I don't think that you will find any further details. Use a second
dongle and this problem goes away.
Regards
Marcel
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On Wed 2006-01-18 (13:48), Marcel Holtmann wrote:
> but maybe not multiple ACL connections and this is what you need in your
> case. So you need at least a CSR chip with HCI 18.x firmware or you
> might wanna simply use another dongle. One for the incoming data and one
> for the outgoing data.
Thanks Marcel for the quick answer. Though you are the messenger with the
bad news... It had not crossed my mind that this could be a problem. Do
you know where I can find some reference to this online?
-David
--
David Mackie
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Hi David,
> I am trying to write a program that forwards one rfcomm connection to
> another connection, but each time I try make a 2nd connection out I get a
> "Too many links(31)" error. Attached is my code but here is some simple
> "psedo code" of it:
>
> rcsocklisten = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
> bind(rcsocklisten, (struct sockaddr *) &loc_addr, sizeof(loc_addr)
> listen(rcsocklisten, 4)
> rcsockin = accept(rcsocklisten, (struct sockaddr *)&rem_addr, &opt)
> rcsockout = socket(PF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM)
> bind(rcsockout, (struct sockaddr *) &addr, sizeof(addr)
> connect(rcsockout, (struct sockaddr *)&addr, sizeof(addr)
> --ERROR here--
>
> hcidump -V -x shows the following:
>
> < HCI Command: Create Connection (0x01|0x0005) plen 13
> bdaddr 00:80:C8:26:FD:6D ptype 0xcc18 rswitch 0x01 clkoffset 0x0000
> Packet type: DM1 DM3 DM5 DH1 DH3 DH5
> > HCI Event: Command Status (0x0f) plen 4
> Create Connection (0x01|0x0005) status 0x00 ncmd 1
> > HCI Event: Connect Complete (0x03) plen 11
> status 0x09 handle 0 bdaddr 00:80:C8:26:FD:6D type ACL encrypt 0x00
> Error: Connection Limit Exceeded
>
> The "Connection Limit Exceeded" is worry and confusing me as I have run
> mutiple rfcomm connections through this chip before.
but maybe not multiple ACL connections and this is what you need in your
case. So you need at least a CSR chip with HCI 18.x firmware or you
might wanna simply use another dongle. One for the incoming data and one
for the outgoing data.
Regards
Marcel
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