Connecting to MIDP using RFCOMM

Hello,

I am trying to get an application to work that communicates between a desktop
and mobile phone using Bluetooth. The handheld is running a Java MIDP application that exposes a service. The desktop connects to the service to
exchange data.

I have this application working when using 2 mobile phones, but the part with
the desktop is giving me problems. I am using a Fedora Core system and Bluez.
The desktop is able to find the Java service on the mobile running on channel 4
(but only when I specifically search for Serial Port services, ie. 'sdptool
search --bdaddr <address> SP'. If I browse the services on the phone it is not
listed). To communicate I setup an RFCOMM connection to this channel and attempt
to open it by doing a cat to the device. The following is the hcidump output of
that process:

$> rfcomm bind /dev/rfcomm0 <address> 4
$> cat > /dev/rfcomm0

< L2CAP(s): Connect req: psm 3 scid 0x0040

< L2CAP(s): Config req: dcid 0x0082 flags 0x0000 clen 4
MTU 1024

< L2CAP(s): Config rsp: scid 0x0082 flags 0x0000 result 0 clen 0

MTU 672
< L2CAP(d): cid 0x82 len 4 [psm 3]

    RFCOMM(s): SABM: cr 1 dlci 0 pf 1 ilen 0 fcs 0x1c

    RFCOMM(s): UA: cr 1 dlci 0 pf 1 ilen 0 fcs 0xd7

< L2CAP(d): cid 0x82 len 14 [psm 3]
RFCOMM(s): PN CMD: cr 1 dlci 0 pf 0 ilen 10 fcs 0x70 mcc_len 8 dlci 8 frame_type 0 credit_flow 15 pri 7 ack_timer 0 frame_size 667
max_retrans 0 credits 7

RFCOMM(s): PN RSP: cr 0 dlci 0 pf 0 ilen 10 fcs 0xaa mcc_len 8 dlci 8 frame_type 0 credit_flow 14 pri 7 ack_timer 0 frame_size 667
max_retrans 0 credits 3
< L2CAP(d): cid 0x82 len 4 [psm 3]

    RFCOMM(s): SABM: cr 1 dlci 8 pf 1 ilen 0 fcs 0xc9

    RFCOMM(s): DM: cr 1 dlci 8 pf 1 ilen 0 fcs 0xe3
< L2CAP(d): cid 0x82 len 4 [psm 3]
    RFCOMM(s): DISC: cr 1 dlci 0 pf 1 ilen 0 fcs 0xfd

< L2CAP(s): Disconn req: dcid 0x0082 scid 0x0040

    RFCOMM(s): UA: cr 1 dlci 0 pf 1 ilen 0 fcs 0xd7

Somehow the mobile does not allow a connection on dlci 8. As I said, I am able
to connect from another mobile. Also, using the above method to connect to
channel 1 on the phone works -- I can give it AT commands using seyon.

Has anyone tried this successfully before? Any ideas on what might be wrong?

Thanks for any help!

Martin van Vliet
Amsterdam, the Netherlands

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