[Bluez-devel] L2Cap Connection problem : PC - Nokia 6600

[Bluez-devel] L2Cap Connection problem : PC - Nokia 6600

[ionut dediu]

Hy everybody.
I'm a newbie (big surprise :). I'm trying to make a
simple chat application between a Nokia 6600 phone
(using j2me ) and my PC (using BlueZ) over L2CAP. The
problem is that I can't get the connection to start.
I'm guessing it's from connection parameters
negotiation (probably imtu and omtu). First I didn't
supply any of the mtus, neither on pc nor phone, then
I used the same values (512). On both situations I get
the following error message from connect : Can't
connect. Connection refused(111). The phone is the
server, and the PC is the client. I don't specify a
psm on the connection string url on the phone because
I get an exception. Instead I let the BCC of the phone
supply me one. Then using the sdptool I find the psm
(which is allways 4097 <-> 0x1001) and use it in the
client application on the PC to connect. The code is
very simple. Here it is :

PHONE :

	public void registerSimpleL2CAPService()
	{
		try
		{
			String serverConnString =
			
"btl2cap://localhost:ABCD;ReceiveMTU=512;TransmitMTU=512;name=Simple";
			server =
				(L2CAPConnectionNotifier)
Connector.open(serverConnString);
			L2CAPConnection clientConn =
(L2CAPConnection)server.acceptAndOpen();
			((TextBox)mainScreen).setString("Connected");
		}
		catch(Exception e)
		{
			((TextBox)mainScreen).setString("BT Exception");
		}
	}

PC :

#define BT_LOCAL_ADDR "00:0C:76:D3:4C:D3"
#define BT_REM_NOKIA_ADDR "00:60:57:D2:27:66"

int do_connect(char * remAddr)
{
	struct sockaddr_l2 rem_addr, loc_addr;
	struct l2cap_options opts;
	int s, opt;

	if ((s = socket(PF_BLUETOOTH, SOCK_SEQPACKET,
BTPROTO_L2CAP)) < 0) {
		syslog(LOG_ERR, "Can't create socket. %s(%d)",
strerror(errno), errno);
		return -1;
	}

	memset(&loc_addr, 0, sizeof(loc_addr));
	loc_addr.l2_family = AF_BLUETOOTH;
	str2ba(BT_LOCAL_ADDR, &loc_addr.l2_bdaddr);
	if (bind(s, (struct sockaddr *) &loc_addr,
sizeof(loc_addr)) < 0) {
		printf("Can't bind socket. %s(%d)", strerror(errno),
errno);
		exit(1);
	}

	// Get default options 
	opt = sizeof(opts);
	if (getsockopt(s, SOL_L2CAP, L2CAP_OPTIONS, &opts,
&opt) < 0) {
		printf("Can't get default L2CAP options. %s(%d)",
strerror(errno), errno);
		return -1;	
	}

	// Set new options
	opts.omtu = 512;
	opts.imtu = 512;
	if (setsockopt(s, SOL_L2CAP, L2CAP_OPTIONS, &opts,
opt) < 0) {
		printf("Can't set L2CAP options. %s(%d)",
strerror(errno), errno);
		return -1;
	}

	memset(&rem_addr, 0, sizeof(rem_addr));
	rem_addr.l2_family = AF_BLUETOOTH;
	baswap(&rem_addr.l2_bdaddr, strtoba(remAddr));
	rem_addr.l2_psm = htobs(4097);
	if (connect(s, (struct sockaddr *)&rem_addr,
sizeof(rem_addr)) < 0 ) {
		printf("Can't connect. %s(%d)\n", strerror(errno),
errno);
		close(s);
		return -1;
	}

	printf("Connected\n");

	return s;

}

int main(int argc, char** argv)
{
	do_connect(BT_REM_NOKIA_ADDR);
	return 0;
}


The hcidump is :

HCIDump - HCI packet analyzer ver 1.8
device: hci0 snap_len: 1028 filter: 0xffffffff
< HCI Command: Create Connection(0x01|0x0005) plen 13
> HCI Event: Command Status(0x0f) plen 4
> HCI Event: Connect Complete(0x03) plen 11
< ACL data: handle 0x0029 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 4097 scid 0x0040
> HCI Event: Number of Completed Packets(0x13) plen 5
> HCI Event: Max Slots Change(0x1b) plen 3
> ACL data: handle 0x0029 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
result 1 status 2
> HCI Event: QoS Setup Complete(0x0d) plen 21
> ACL data: handle 0x0029 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
result 3 status 0
< HCI Command: Disconnect(0x01|0x0006) plen 3
> HCI Event: Command Status(0x0f) plen 4
> HCI Event: Disconn Complete(0x05) plen 4

What means result 3 status 0, from hcidump ? Sorry I'm
not familiar with hcidump. Thanks a lot in advance.



	
		
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Re: [Bluez-devel] L2Cap Connection problem : PC - Nokia 6600

[Marcel Holtmann]

Hi,

> I'm a newbie (big surprise :). I'm trying to make a
> simple chat application between a Nokia 6600 phone
> (using j2me ) and my PC (using BlueZ) over L2CAP. The
> problem is that I can't get the connection to start.
> I'm guessing it's from connection parameters
> negotiation (probably imtu and omtu). First I didn't
> supply any of the mtus, neither on pc nor phone, then
> I used the same values (512). On both situations I get
> the following error message from connect : Can't
> connect. Connection refused(111). The phone is the
> server, and the PC is the client. I don't specify a
> psm on the connection string url on the phone because
> I get an exception. Instead I let the BCC of the phone
> supply me one. Then using the sdptool I find the psm
> (which is allways 4097 <-> 0x1001) and use it in the
> client application on the PC to connect. The code is
> very simple. Here it is :

I can't tell you anything about J2ME programming, but in general there
is no need to give the MTU values. The L2CAP will negotiate the default
values. In most cases it is 672.

> HCIDump - HCI packet analyzer ver 1.8
> device: hci0 snap_len: 1028 filter: 0xffffffff
> < HCI Command: Create Connection(0x01|0x0005) plen 13
> > HCI Event: Command Status(0x0f) plen 4
> > HCI Event: Connect Complete(0x03) plen 11
> < ACL data: handle 0x0029 flags 0x02 dlen 12
>     L2CAP(s): Connect req: psm 4097 scid 0x0040
> > HCI Event: Number of Completed Packets(0x13) plen 5
> > HCI Event: Max Slots Change(0x1b) plen 3
> > ACL data: handle 0x0029 flags 0x02 dlen 16
>     L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
> result 1 status 2
> > HCI Event: QoS Setup Complete(0x0d) plen 21
> > ACL data: handle 0x0029 flags 0x02 dlen 16
>     L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
> result 3 status 0
> < HCI Command: Disconnect(0x01|0x0006) plen 3
> > HCI Event: Command Status(0x0f) plen 4
> > HCI Event: Disconn Complete(0x05) plen 4
> 
> What means result 3 status 0, from hcidump ? Sorry I'm
> not familiar with hcidump. Thanks a lot in advance.

You can open the Bluetooth specification and look it up. However the
result 3 means "Connection refused - security block". There is no
pairing between your devices or the hcid is not running.

Some line above you have result 1 with status 2 and this means
"Connection pending" with "Authorization pending".

Regards

Marcel




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Re: [Bluez-devel] L2Cap Connection problem : PC - Nokia 6600

[ionut dediu]

    Thank you very much for your fast reply. I have
hcid running and my phone and the PC are indeed paired
( as I can see from the phone ). 
    I also tried establishing a RFCOMM connection, but
that didn't work also. I guess the problem is from the
bluetooth J2ME API implementation which doesn't
establish the correct security parameters. Anyway, I
did the same program on the phone in Symbian C++, and
it works. If someone else tried programming in J2ME
for bluetooth between a phone and a PC running BlueZ,
please reply and tell me if you had the same
authentication problems.
     Thanks again. Best of luck.

--- Marcel Holtmann <marcel@holtmann.org> wrote:
> Hi,
> 
> > I'm a newbie (big surprise :). I'm trying to make
> a
> > simple chat application between a Nokia 6600 phone
> > (using j2me ) and my PC (using BlueZ) over L2CAP.
> The
> > problem is that I can't get the connection to
> start.
> > I'm guessing it's from connection parameters
> > negotiation (probably imtu and omtu). First I
> didn't
> > supply any of the mtus, neither on pc nor phone,
> then
> > I used the same values (512). On both situations I
> get
> > the following error message from connect : Can't
> > connect. Connection refused(111). The phone is the
> > server, and the PC is the client. I don't specify
> a
> > psm on the connection string url on the phone
> because
> > I get an exception. Instead I let the BCC of the
> phone
> > supply me one. Then using the sdptool I find the
> psm
> > (which is allways 4097 <-> 0x1001) and use it in
> the
> > client application on the PC to connect. The code
> is
> > very simple. Here it is :
> 
> I can't tell you anything about J2ME programming,
> but in general there
> is no need to give the MTU values. The L2CAP will
> negotiate the default
> values. In most cases it is 672.
> 
> > HCIDump - HCI packet analyzer ver 1.8
> > device: hci0 snap_len: 1028 filter: 0xffffffff
> > < HCI Command: Create Connection(0x01|0x0005) plen
> 13
> > > HCI Event: Command Status(0x0f) plen 4
> > > HCI Event: Connect Complete(0x03) plen 11
> > < ACL data: handle 0x0029 flags 0x02 dlen 12
> >     L2CAP(s): Connect req: psm 4097 scid 0x0040
> > > HCI Event: Number of Completed Packets(0x13)
> plen 5
> > > HCI Event: Max Slots Change(0x1b) plen 3
> > > ACL data: handle 0x0029 flags 0x02 dlen 16
> >     L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
> > result 1 status 2
> > > HCI Event: QoS Setup Complete(0x0d) plen 21
> > > ACL data: handle 0x0029 flags 0x02 dlen 16
> >     L2CAP(s): Connect rsp: dcid 0x0056 scid 0x0040
> > result 3 status 0
> > < HCI Command: Disconnect(0x01|0x0006) plen 3
> > > HCI Event: Command Status(0x0f) plen 4
> > > HCI Event: Disconn Complete(0x05) plen 4
> > 
> > What means result 3 status 0, from hcidump ? Sorry
> I'm
> > not familiar with hcidump. Thanks a lot in
> advance.
> 
> You can open the Bluetooth specification and look it
> up. However the
> result 3 means "Connection refused - security
> block". There is no
> pairing between your devices or the hcid is not
> running.
> 
> Some line above you have result 1 with status 2 and
> this means
> "Connection pending" with "Authorization pending".
> 
> Regards
> 
> Marcel
> 
> 
> 
> 
>
-------------------------------------------------------
> This SF.Net email is sponsored by the new
> InstallShield X.
> From Windows to Linux, servers to mobile,
> InstallShield X is the one
> installation-authoring solution that does it all.
> Learn more and
> evaluate today!
> http://www.installshield.com/Dev2Dev/0504
> _______________________________________________
> Bluez-devel mailing list
> Bluez-devel@lists.sourceforge.net
>
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